Plate III. 



Diadema antillarum 1, 10, 16. D. mexicanum 2, 20 D. Savignyi <i, «. D. «lobulosum 7. D. saxatile 



22 23, 29. Centrostephanus Rodgersii 4. Astropyga radiata 15, 19. A. pulvinata 3. Cluctodiadema gra- 



nulatum 11. Eehinotlirix diadema 9, 14, 24, 27. E. calmaris 5, 13, 17, 21, 30 Aspi.lodiadema .lacobyi 25. 



A. tonsum 2(i. Plesiodiadema antillarum 18. PI. microtuberculatum 28. Cænopedina mirabilis 12. 



Fig. 1. Valve of large tridentate pedicellaria of Diadema aiüiUanim. Zeiss. AA. Oc. 2. 

 ., _ . small - — mexicaniirn. -- — 3. 



— 3. — - tridentate pedicellaria of Astropyga piilvinata. Zeiss. AA. Oc. 3. 



— 4. — - ophicepbalous - - Centrostephanus Rodgersii. Seibert. Obj. II. Oc. 0. 



— 5. - - tridentate — large form, of £c/ii;io//inx- ca/(i;7i(iri.s. Seib. Obj. II. Oc. 1. 



_ g _ . __ _ small — from the buccal membrane of Diadema Savignyi; 



side view (comp. PI. V. 24). Zeiss. Apochr. 80. Comp. Oc. 4. 



— 7. Valve of tridentate pedicellaria of Diadema glohiilosum. Zeis AA. Oc. 2, 



_ 8 _ . _ — large form, of Diorfe/Ji" Saci!/;!//'- Zeiss. AA. Oc. 1. 



— 9. Tridentate pedicellaria, large form, of £:c/iino(/iri.c rfmid-ma. Zeiss. AA Oc. 1. 



— 10. Valve of tridentate pedicellaria, small form, of Diadema anlillaram ; front view (comp. PI. V. 



13). Zeiss. AA. Oc. 3. 



— 11. Valve of ophicephalous pedicellaria of Chœtodiadema gramilalum Zeiss. D. Oc. 1. 



— 12. - - tridentate pedicellaria of Cwnopedina mirabilis. Zeiss. Apochr. 8 Comp. Oc. 4. 



— 13. Tridentate pedicellaria, large form, of Eclnnotl)ri.v calamaris Seib. Obj. 0. Oc. 0. 



— 14. Valve of tridentate pedicellaria, large form, of Eclunotlxri.v diadema. Zeiss. AA. Oc. 1. 

 _ 15. _ . _ _ (1 form, small), of Astropyga radiata. — — 

 _ 16. _ - ophicephalous — of Diadema antillarum. Zeiss D. Oc. 1 



— 17. Spicules from tube feet of Echinothrix calamaris. Zeiss. AA. Oc. 1. 



— 18. Valve of ophicephalous pedicellaria, small form, of Aspidodiadema antillarum {„microlubereu- 



latam", „Challenger", st 122). Seib. Obj. II. Oc. III. 



— 19. Valve of tridentate pedicellaria (II. form) of Astropyga radiata. Zeiss. AA. Oc. 3. 

 „ 20. — - - large form, of Diadema mexicanum. — — 2. 



__ 21. — - — — small — - Echinotlirix calamaris. Seib. Obj. II. Oc. I. 



_ 22. — - — — large — - Diadema sa.ralile: side view. Zeiss. AA. Oc. 1. 



— 23. Tridentate pedicellaria, small form, of Diadema saxatile. Zeiss. Apochr. 100. Comp. Oc. 2. 



— 24. Spicule from tubefoot of Ecliinotlirix diadema. Zeiss. AA. Oc. 1. 



— 25. Valve of an ophicephalous pedicellaria, large form, of Aspidodiadema Jacobyi. Zeiss. AA. Oc. 1. 

 _26__— -- - <o;i,siim. Seib. Obj.II. Oc.O. 



— 27. Spicules from tubefoot of Echinothrix diadema. Zeiss. AA. Oc. 1. 



— 28. Tridentate pedicellaria oWlesiodiadema microtuberculatum „Challenger'-, st. 134). Zeiss. AA. Oc. 2. 



— 29. Valve of tridentate pedicellaria. large form, of /Ji<((/c/ii(( .s'l.«-,!///.', IVom the inside. — 1- 

 _ 30. — - — — _ _ - Echinothrix e<damaris. Seib. Obj. 0. Oc. III. 



