EGHINONEUS PLATE 9 “ALBATROSS TROPIGAL PACIFIG Ex.
1899-1900. Me:
go AM Westeréren del
PLATE10. 1-10.EchinonéuscyclostomusLEskKe. 1.—Alimentarycanal,madreporictube,andreproductiveorgans,seenfromrightside,withboth sidesoftestremoved.Specimenwithspinesmeasured22mm.long. 2.—Thesameseenfromleftside. 3.— Actinal part of intestine, actinal intestinal appendage, oesophagus, and madreporic tube removed from test, which without spines measured 4.19 mm.
long.
4.— Longitudinal section of anterior end of test, showing appendage of alimentary canal, oesophagus, andmadreporictube,heldinplacebymesenteries.Testwithspinesmeasured22mm.long. 5.— Profile of oesophagus, madreporie tube, and genital ducts, showing folding of edge of mesentery. Specimen with spines measured 21 mm.
long.
6.—Axialorganwithmesenterylaidback,showingnervealongoutsideedge.Sameindividualas Figure 5. : 7.—Oralsystemwithsurroundingcoronalplates,seenfrominterior,withpentagonalandradial nerves, and water-vascular canals, showing oesophagus fastened to inner margin of pentagon. Dissected to show mouth in centre of buccal membrane. Test without spines measured 21 mm.
long. 7 8.—Nervewithradialcanal,andtwoampullae,fromoddanteriorambulacrum,actinalside,midway actinalsystem,andambitus.Testwithoutspinesmeasuring21mm.long. 9.—Mesenteryandoutsideedgeofintestine,showingsurfacefolds.Testwithoutspinesmeasuring 21 mm.
long.
10.—Outsideedgeofabactinalalimentarycanalwithmesentery.Testwithspinesmeasuring22mm. long.
PortAntonio,Jamaica,H.L.Clark.
“ALBATROSS TROPIGAL PAGIFIG Ex. 1899-1900. GHINONEUS PLATE 10. A.M Westersren del B.Meis ‘¥
PLATE11. 1-10. Echinonéus cyclostomus LESKE. 1.—Transversesection,showingactinalfloorandlanterninposition.Testwithoutspinesmeasuring 3.70 mm.
long. 2.—Lanterninnaturalposition,fromsamespecimenasFigure1,showingoesophagus,compasses, Diameterofactinostome1.35mm.andoflantern1.24mm.long. and various muscles. Test without spines 3.—Oralandpartofanalsystem,showinggills,tentacles,andsphaeridia. measuring 4.19 mm.
long. 4.—Firstspiculesroundtheteethonthebuccalmembrane,seenfrominterior.Samespecimenas Figures1,2,and3. 5—Interiorviewofactinalsystemwiththerudimentaryauricles. Specimen without spines measuring 4.19 mm.
long. 6.— Odd anterior ambulacrum, interior view with auricles, enlargement of same specimen as Figure 5.
7.—Centreoforalsystemexpanded,showingtipsofteeth.Testwithoutspinesmeasuring4.10mm. Diameter of actinostome 1.26 mm.
long. 8.— Profile longitudinal section exposing lantern, madreporic tube, and right side of alimentary canal. Test without spines measuring 4.25 mm.
long. 9.—Profilelongitudinalsection,lanternresorbed,withviewofoesophagusandrightsideofalimentarycanal.Testwithoutspinesmeasuring5.16mm.long. 10.— Actinostome interior view, auricles resorbed, length of mouth aperture 1.18 mm, Same specimen as Figure 9.
PortAntonio,Jamaica,H.L.Clark,