Plate V. 



Stcplianocidaris bispinosa 20, 25. Plesiodiadenia antillarum 4, 32. PI. microtuberculatum 30. Aspido- 

 diadema toiisum fi, 31. A. Jacobj'i 28. Diadema antillarum 13. D. mexicanum 1. D. Savignyi 7, 9, 24. 

 D. saxatilc 2, â, 8, 12, 14, 15. Astropyga radiata 27. Chætodiadcma gramilatum 10, 18, 19, 22, 35. 

 Echinothrix calainaiis 3, 11. Ceiitn)stephanu,s loiigispinus 29. C. Rodgersii 34. Micropyga tuberciilata 

 33, 37. Üpecbinus spectabili.s 21. .Salmaiis sphæioides 23. Microcj'phiis aniuilatus 17. l'.sanimcchinus 

 rufii.s II). l'aïasalcnia giatiosa 3(). Ecbinometra oblonga 2fi. 



Kig. 1. Tridentate pedicellaria, large form, of Diadema mexicanum. Zeiss. Apochr. 160. Oc. 2. 



— 2. — — - — - - sa.i utile. Zeiss. Apochr. 160. Oc. 2. 



3. Valve of tridentate pedicellaria, small form, of Ecliinotliri.t calamaris. Seib. Obj. II. Oc. I. 



— 4. Opliiceplialoiis pedicellaria, large form, of Plesiodiadema aiilillarum Zeiss. AA. Oc. 3. 



— 5. Valve of tridentate pedicellaria. small form. »{Diadema sa.vatile. front view (comp. Fig. 8). 



Zeiss. AA. Oc. 3. 



— 6. Tridentate pedicellaria of Aspidodiadema lonsiim. Zeiss. AA. Oc. 3. 



— 7. — - large form, of Diadema .Siipii/hi//. Zeiss. Apochr. 160. Comp. Oc. 2. 



— 8. Valve of tridentate pedicellaria, small form, of Diadema sa.iatilc; side view (comp. Fig. 5). 



Zeiss. AA. Oc. 3. 



— 9. Valve of tridentate pedicellaria, small form, of Diadema Sariniifii. Zeiss. AA. Oc. 2. 



— 10. Spine of C.hætodiadema iiranulatiim; basal part. " i. 



— 11. Valve of ophiceplialous pedicellaria of Ecliinolhri.r calaiiKiris. Zeiss. Apochr. 8'0. Comp. Oc. 4. 



— 12. Spicules from the partition wall of abactinal tubefoot of Diadema sa.ratilc. Zeiss. AA. Oc. 1. 



— 13. Valve of tridentate pedicellaria, small form, of Diadema aiilillanim: side view {conij). 1*1. III. 



10). Zeiss. AA. Oc. 3. 



— 14. Valve of tridentate pedicellaria of Diadema sa.vatile: side view (comp. Fig. 15). Zeiss. AA. Oc. 3. 



— 15. — - — — - - - front — { — -- 14). — — 2. 



— 16. Plates and spicules from buccal membrane of Psammecliinus nifns; in the natural position. 



Zeiss. AA. Oc. 3. 



— 17. Plate from buccal membrane of Micioeiiphnx annulatiis. Zeiss. Apochr. SO. Comp. Oc. 2. 



— 18. Transverse section of the outer end of a large actiiial spine of CJuvtodiadema yranulatiim. 



Zeiss. AA. Oc. 3. 



— 19. Transverse section of large abactinal spine of Chcetodiadema granulatiim. Zeiss. AA. Oc. 3. 



— 20. Spicules from the genital organs of Stephanoeidaris bi.spinosa. Zeiss D. Oc. 1 



— 21. " — buccal membrane of Opcchiniis specUdiilis: natural position. Zeiss. D. Oc. 1. 



— 22. Valve of small tridentate pedicellaria of C/i(('/o(/i(((/e;/i(( (/;((mi?(i/(niî (comj). Fig. 35). Zeiss. AA. Oc. 3. 



— 23. Spicules of Salmaci.'i spha'ruides : a, c. from the genital organs, b. from the stonecanal. Zeiss. 



Apochr. 80. Comp. Oc 4. 



— 24. Valve of small tridentate pedicellaria from the buccal membrane of Diadema Sauiiiiuii; front 



view (comp. PI. III. 6). Zeiss. Apochr. 80. Comp. Oc. 4. 



— 25. Spicules from the intestine of Stephanoeidaris bispinosa. Zeiss. D. Oc. 1. 



— 26. — tube foot of Kchinometia ohlonga. Zeiss. D. Oc. 1. 



— 27. Valve of tridentate pedicellaria, large form, of Aslropuç/a radiala. Zeiss. AA. Oc. 1. 



— 28. — - — — of Aspidodiadema Jacobyi. Zeiss. AA. Oc. 3. 



— 29. — - — — - Cenlrosteplianus longispinns. Selb. Obj. 0. Oc. 0. 



— 30. — - — — - Plesiodiiulcma microtuberculatum. Zeiss, AA. Oc. 2. 



— 31. Triphyllous pedicellaria of Aspidodiadema tousum. Zeiss. AA. Oc. 3. 



— 32. Ophiceplialous — small form, of Plesiodiadenia antillarum. Zeiss. AA. Oc. 3. 



— 33. Valve of small tridentate pedicellaria of Micrupyya luberculata (comp. Fig. 37). Zeiss. AA. Oc. 3. 



— 34. — - tridentate pedicellaria of Cenlruslcpiiainis liodyersii. Seib. Obj. II. Oc. 0. 



— 35. — - — — - Cluctoiliailema yranulatum (eomj). Fig. 22). Zeiss. AA. Oc. 1. 



— 36. — - — — - Paras(denia yratiosa. Zeiss. AA. Oc. 1. 



— 37. - — — - Micropyija luberculata (comp. Fig. 33). Zeiss. AA. Oc. 1. 



