CHILOGLANIS. 485 separated on the median line, forming 4 or 5 transverse series ; 6 mandibular teeth ; maxillary barbel scarcely longer than eye, lower labials shorter still. Dorsal I 5; spine not serrated, } length of head. Adipose fin low, 4 as long as its distance from rayed dorsal. Anal III 7. Pectoral spine 2 length of head. Ventral extending to origin of anal. Caudal deeply forked. Caudal peduncle nearly twice as long as deep. Pale brownish above, with four irregular dark cross-bands connected by a dark lateral stripe, whitish beneath ; two dark bars across the anal; a dark bar at the base of the caudal, another across each lobe of the fin, and a dark streak along the lower lobe.
Total length 55 millim.
Mathoiya River (Tana System), Kenya district.
1. Type. Mathciya R. S. L. Hinde, Esq. (P-).
7. CHILOGLANIS BATESII.
Bouleng. Ann, & Mag. N. H. (7) xiv. 1904, p. 19.
Body somewhat depressed in front, compressed behind, its depth 5 to 6 times in total length. Head depressed, 14 times as long as broad, its length 3 times in total length; eye directed upwards, in second half of head, 5 to 6 times in length of head and equal to or a little less than interorbital width, which exceeds the distance between eye and posterior Fig.363.
Chiloglanis batesiz.
Type. 4.
nostril ; premaxillary teeth in two large oval groups, well separated on the middle line, forming 3 or 4 transverse series; a group of 8 to 12 mandibular teeth ; maxillary barbel as long as eye, lower labial barbels shorter still. Dorsal 15; spine not serrated, 2 to 4 length of head. Adipose low, its base barely } its distance from the rayed dorsal. Anal III 5-6. Pectoral spine not serrated, about } length of head.
486 SILURID.
Ventral extending beyond origin of anal. Caudal deeply forked, upper lobe more or less produced. Caudal peduncle twice as long as deep. Yellowish brown above, with large dark brown marblings forming more or less regular cross-bands; a black bar at the base of the caudal; lower parts white; fins whitish, a greyish band across the caudal. Total length 38 millim.
South Cameroon.
1-4. Types. Efulen. G. L. Bates, Esq. (C.).
5. Type. Tributaries of Lobi R., iF S.W. of Hfulen.
6. Her. Lobi R. 35 7-16. Ad. & her. Ja R. 5 31. HUCHILICHTHYS.
Bouleng. Ann. & Mag. N. H. (7) vi. 1900, p. 522, Poiss. Bass. Congo, p. 330 (1901), and Ann. Mus. Congo, Zool. ii. p. 47 (1902). Body moderately elongate, not or but feebly compressed. Dorsal fin entirely in advance of ventrals, formed of a spine and 6 branched rays ; an adipose fin opposed to the anal, which is short. Pectoral with a spine. Ventral with 7 rays. A cephalo-nuchal bony shield. Mouth large, inferior, surrounded by a much-developed, circular, papillose lip ; a broad band of pointed, curved, movable teeth in the premaxillaries, this band entirely in advance of the narrower band of mandibular teeth, the base of which is long and slender, the crown truncate or notched and bent up hook-like. A barbel on each side, and a pair of very short ones on each side of the lower section of the circular lip. Nostrils rather close together, the posterior with a valve; eye with free border. Gill-openings short, confined to the sides. Air-bladder small, free, trilocular.
Vertebre: 37 (16-+21). 8 branchiostegal rays.
Congo System.
Synopsis of the Species.
Depth of body 7 times in total length ; eye 10 times in length of head, 5 times in interocular width; base of adipose fin 1 its distance from dorsal. . . . . . . . 1. E. guentheri, Schilth., p. 487. Depth of body 53 to 64 times in total length ; eye 0 to 7 times in length of head, 2 to 3
EUCHILICHTHYS. 487 times in interocnlar width ; base of adipose fin 2 to $ its distance from dorsal. . . . 2. E. royauwi, Blgr., p..488. Depth of body 44 times in total length ; eye 5 to 55 times in length of head, 2 times in interocular width; base of adipose fin nearly equal to its distance from dorsal . . . . 3. E. dybowski/, Vaill., p. 489. 1. EUCHILICHTHYS GUENTHERI.
Atopochilus guentheri, Schilth. Tijdschr. Nederl. Dierk. Ver. (2) iii. 1891, p. 86, pl. vi. fig. 2.
uchilichthys guentheri, Ann. & Mag. N. H. (7) vi. 1900, p. 523, and Poiss. Bass. Congo, p. 331 (1901).
Depth of body % its greatest width, 7 times in total length. Head large, much depressed, covered with soft skin, a little longer than broad, its length 34 times in total length; snout broadly rounded, nearly twice as long as postocular part of head; nostrils nearer end of Fig.364, Luchilichthys quentheri, Type. 3.
snout than eye, the diameter of which is 10 times in length of head, 5 times in interocular width; buccal cleft straight, nearly half length of head; mandibular teeth notched; lateral barbel + length of head, posterior barbels about half diameter of eye. Dorsal I 6, originating immediately behind pectorals ; spine strong, covered with skin, measuring ‘+ length of head. Adipose fin } its distance from rayed dorsal. Anal 10 (5 rays rudimentary). Pectoral spine 4 length of head, its
488 SILURIDA.
inner border with strong retrorse spines. Ventrals not reaching anal. Caudal forked, lower lobe the longer. Caudal peduncle 1} times as long as deep. Skin villose. Dark brown, with small round black spots on the anterior parts.
_ Total length 190 millim.
Congo (Stanley Pool).
1. Type. Kinshassa. M. A. Greshoff (C.) ; Utrecht University Museum (E.).
2. EUCHILICHTHYS ROYAUXI.
Bouleng. Ann. Mus. Congo, Zool. ii. p. 46, pl. xiii. (1902). Depth of body about 2 its greatest width, 5} to 6} times in total length. Head large, much depressed, covered with soft skin, a little ‘longer than broad, its length 3 to 33 times in total length; snout Fig.365.
Euchilichthys rayauar.
Type (A. M.C.). 3.
broadly rounded, nearly twice as long as postocular part of head; nostrils nearer end of snout than eye, the diameter of which is 5 to 7 times in length of head, 2 to 3 times in interocular width; buccal cleft straight, about + length of head; mandibular teeth truncate or feebly notched; lateral barbel + length of head, posterior about }
EUCHILICHTHYS. 489 diameter of eye. Dorsal I 6, originating immediately behind pectorals ; spine strong, covered with skin, + to 4 length of head. Adipose fin ¢ to 3 its distance from rayed dorsal. Anal ILI-IV 6-7. Pectoral spine 3 to ? length of head, inner border serrated. Ventrals not reaching anal. Caudal forked, lower lobe the longer. Caudal peduncle 1} times as long as deep. Skin villose. Olive or brownish, often with small round black spots; caudal region sometimes darker, with a yellowish ring round the caudal peduncle behind the adipose fin. Total length 220 millim.
Congo System.—Type in Congo Museum, Tervueren.
1. One of the types. Banzyville, Ubanghi. Capt. Royaux (C.). 2. Skel. 43 x 55 3-4. Her. & yg. Lindi R., Upp. Congo. M. M. Storms (C.) ; Brussels Museum (P.).
5-9. Ad. & hgr. Libi R., 8S. Cameroon. G. L. Bates, Esq. (C.). 3. EUCHILICHTHYS DYBOWSKIIL.
Chiloglanis dybowskii, Vaill. C. R. Soc. Philom. 1892, no. 16, p. 2. Euchilichthys dybowskii, Bouleng. Ann. & Mag. N. H. (7) vi. 1900, p. 523, and Poiss. Bass. Congo, p. 332 (1901).
Body a little deeper than broad, its depth 44 times in total length. Head large, moderately depressed, covered with a very thin skin, not quite 1} times as long as broad, its length 22 times in total length ; snout rounded, nearly twice as long as postocular part of head ; nostril nearer end of snout than eye, the diameter of which is 5 to 55 times in length of head, twice in interocular width; buccal cleft straight, % length of head; mandibular teeth with truncate crowns; lateral barbel nearly 4+ length of head, posterior shorter still. Dorsal I 6; spine strong and smooth, 2 length ‘of head. Adipose fin much longer than deep, nearly as long as its distance from rayed dorsal. Anal 10 (3 rays rudimentary). Pectoral spine 2 length of head, inner border with 4 or 5 strong retrorse serre. Ventrals extending a little beyond origin of anal. Caudal deeply emarginate. Caudal peduncle as long as deep. Skin villose on sides of body. Pale brown; a blackish band across the dorsal, another across the pectorals; ventrals and anal blackish.
Total length 39 millim.
Ubanghi.—Types, in Paris Museum, examined.
490 SILURID.®.
32. ATOPOCHILUS.
Sauvage, Bull. Soc. Philom. (7) iii. 1878, p. 96, and N. Arch. Mus. (2) i. 1880, p: 42; Bouleng. Ann. & Mag. N. H. (7) vi. 1900, p. 524. Body moderately elongate, feebly depressed. Dorsal fin entirely in advance of ventrals, formed of a spine and 6 branched rays; an adipose fin opposed to the anal, which is short. Pectoral with a strong spine. Ventral with 7 rays. A cephalo-nuchal bony shield. Mouth large, inferior, surrounded by a much developed, circular, papillose lip; teeth fine, slender, movable, truncate, bent at an obtuse angle and forming a very broad band in the premaxillaries, this band entirely in advance of the narrower band of mandibular teeth, which are similar to the premaxillaries, but closer together ; conical teeth on the vomer; a barbel on each side, and another pair on the posterior border of the lip; nostrils close together, the posterior with a valve; eyes with free border. Gill-openings short, confined to the sides.
Gaboon to Angola.
Two species :— Length of head 33 times in total length; eye 45 times in length of head and not more than twice in interorbital width ; anal with 11 rays Hlcloc ogee Tae 1. A. savorgnani, Sauy., p. 490. Length of head 2? times in total length; eye 63 times in length of head and 24 times in interorbital width ; anal with 9 rays . 2. A. macrocephalus, Blgr., p. £91. 1. ATOPOCHILUS SAVORGNANI.
Sauy. Il. ce. pl. iii. fig. 3; Bouleng. 1. ¢.
Depth of body a little less than its greatest width, 52 times in total length. Head depressed, 1} times‘as long as deep, a little longer than broad, its length 332 times in total length; upper surface of head a little rugose ; snout broadly rounded, its length 2} times postocular part of head ; nostrils nearer end of snout than eye, the diameter of which is 45 times in length of head, 12 times in interorbital width ; buccal cleft straight, 2 length of head; band of mandibular teeth not half as broad as that of premaxillaries; lateral barbel + length of head, more than twice as long as posterior barbel. Occipito-nuchal shield as long as broad, ending in two points. <A striated, acutely pointed humeral process, Dorsal I 6; spine striated, } length of head. Adipose dorsal 3 times as long as deep, 2 its distance from rayed dorsal. Anal 11
ATOPOCHILUS. 491 (2 rays rudimentary). Pectoral spine strong, striated, strongly serrated on inner side, # length of head. Ventral nearly reaching origin of anal. Caudal peduncle 14 times as long as deep. Greyish above, with Fig.366.
Atopochilus savorgnani.
Type,atterSauvage,7.c.
a dark band between the adipose fin and the anal, and a dark blotch at the base of the caudal; fins transparent, without markings. Total length 90 millim.
Upper Ogowe.—Type, in Paris Museum, examined.
2. ATOPOCHILUS MACROCEPHALUS.
Bouleng. Ann. & Mag. N. H. (7) xvii. 1906, p. 112. Depth of body % its greatest width, 5 times in total length. Head much depressed, 14 times as long as broad, its length 2} times in total length, its upper surface slightly rugose; snout broadly rounded, its length 23 times postocular part of head; nostrils nearer end of snout than eye, the diameter of which is 64 times in length of head and 24 times in interorbital width; buccal cleft 2 length of head; band of premaxillary teeth interrupted in the middle, as broad as the lower lip ; lateral barbel 4 length of head, more than twice as long as posterior
499 SILURID &.
barbel. Occipito-nuchal shield broader than long. A striated, acutely pointed humeral process. Dorsal I 6; spine striated, 3? length of head. Adipose fin 3 times as long as deep, 3 its distance from rayed dorsal. Anal 9 (3 rays rudimentary). Pectoral spine striated, serrated on inner border, 2 length of head. Ventral reaching origin of anal. Caudal Fig.367.
Atopochilus macrocephalus.
Type.
peduncle slightly longer than deep. Slate-grey when fresh, with three yellowish bars on the body, the first above the pectoral fin, the second in front of the adipose fin, the third on the caudal peduncle; head greenish grey above, greenish yellow beneath; fins greenish yellow, ventrals, anal, and caudal with a dark brown bar. Total length 75 millim.
Kwango River (Congo System), Angola.
1. Type. Kwango R. at Fort Don Carlos. Dr. W. J. Ansorge (C.). 33. MOCHOCUS.
Joannis, Mag. Zool. 1835, iv. ; Giinth. Cat. Fish. v. p.217 (1864) ; Bouleng. Ann. & Mag. N. H. (7) vi. 1900, p. 525, and Fish. Nile, p. 388 (1907). Rhinoglanis, Giinth. t. ¢. p. 216.
Body moderately elongate, slightly compressed. Anterior dorsal ending over the ventrals, formed of a strong spine and 6 to 8 branched rays; a second dorsal, formed of soft rays *, above the short anal fin. * This second dorsal fin corresponds to the adipose fin of most Siluride ; the rays are true articulated rays, but, as in Clarotes, they are devoid of endoskeletal supports, or interneurals,