100 FOSSIL ECHINI OF THE WEST INDIES. 



DESCRIPTION OF PLATES. 



[The accompanying plates were made up to be reduced to a uniform width of 5K inches. 

 This proved to be undesirable, and the plates are reduced to 5 inches in width, with in most 

 cases a corresponding slight reduction of the original figures. The approximate size of the 

 figures is given in the descriptions. Where desired the exact size of specimens can usually 

 be obtained from the descriptions in the text.] 



PLATE 1. 



FIG. 1. Cidaris anguilla Cotteau. Cotype, X 3.4; spine; Anguilla; U. S. Nat. Mus. 

 No. 115393. 



FIGS. 2-5. Cidaris peloria, sp. nov. Spines and interambulacral plate, X 0.9; (2) base 

 and shaft, holotype; (3) interambulacral plate; (4) tip of probably 

 a ventral spine; (5) base and tip with estimated interval indicated 

 by dotted lines; (3 to 5) paratypes; near San Sebastian, Porto 

 Rico; Amer. Mus. Nat. Hist. No. 18564. 



FIGS. 6, 7. Cidaris foveata, sp. nov. Holotype, X 0.9; (6) dorsal and (7) side views of 

 the same specimen. The peculiar pits are best seen in right inter- 

 ambulacrum. Jamaica; Mus. Comp. Zool. No. 3234. 



FIGS. 8-10. Cidaris loveni Cotteau. Holotype, X 0.9; (8) dorsal, (9) ventral, and 

 (10) side views of same specimen; St. Bartholomew; U. S. Nat. 

 Mus. No. 115415. 



FIG. 11. Cidaris clevei Cotteau. Holotype, X 4; side view of interambulacrum and 

 two half-ambulacra; Anguilla; U.S. Nat. Mus. No. 115400. 



FIGS. 12-17. Cidaris melitensis Wright. Tests and spines, X 0.8; (12) dorsal, (13) 

 ventral, and (14) side views of the same specimen; (15) spines; 

 (16) dorsal and (17) ventral views of an immature specimen; 

 Anguilla; U. S. Nat. Mus. No. 115399. 



FIGS. 18-20. Cidaris tribuloides (Lamarck). Test, XI; (18) dorsal, (19) ventral, 

 and (20) side views of same specimen, Santiago de Cuba; U. S. 

 Nat. Mus. No. 328221. 



FIGS. 21-24. Echinometra prisca Cotteau. Cotype, X 1.8; (21) dorsal, (22) ventral, 

 (23) side view in longer axis, and (24) side view in shorter axis of 

 same specimen; Anguilla; U. S. Nat. Mus. No. 115398. 



PLATE 2. 



FIG. 1. Echinopedina cubensis Cotteau. Dorsal view, X 0.9; Rio Gurabo, Dominican 

 Republic; U. S. Nat. Mus. No. 328232. 



FIGS. 2-5. Lanieria lanieri (Cotteau). (2) Dorsal view of large specimen and (3) 

 left side view of same specimen, X 0.9; (4) dorsal view of smaller 

 specimen, X 1.8; (5) ventral view of another small specimen, 

 X 1.8; Cuba; Phila. Acad. Nat. Sci. No. 1505. 



FIGS. 6, 7. Sismondia antillarum Cotteau. Holotype, X 1.8; (6) dorsal and (7) ven- 

 tral views of same specimen; St. Bartholomew; U. S. Nat. Mus. 

 No. 115394. 



FIGS. 8, 9. Sismondia anguilla Cotteau. Holotype, X 1.8; (8) dorsal and (9) ventral 

 views of same specimen. The periproct is very small. Anguilla; 

 U.S. Nat. Mus. No. 115421. 



FIGS. 10, 11. Clypeaster concavus Cotteau. Cotype, X 0.9; (10) dorsal and (11) ven- 

 tral views of same specimen; Anguilla; U. S. Nat. Mus. No. 

 115376. . 



FIG. 12. Clypeaster concavus Cotteau. Four-rayed specimen, X 0.9; near Cevicos, 

 Dominican Republic; U. S. Nat. Mus. No. 328233. 



PLATE 3. 



FIGS. 1, 2. Clypeaster caudatus, sp. nov. Holotype, XI; (1) dorsal and (2) left side 

 views of same specimen; Los Quemados, Dominican Republic; 

 U. S. Nat. Mus. No. 328235. 



