Plate XL 



Fig. I. Piece of transverse section of a primary spine of Cidaris affijiis. Obj. II. Oc. o. 



— 2. — - — — - spines of Troinikosoiiia Koehleri\ a — b. sections of priniar\' actinal 



spines, c. of an abactinal spine. Obj. II. Oc. I. 



— 3. Piece of transverse section of a primary spine of Porocidaris purpurata. Obj. II. Oc. I. 



— 4. — - — — - spines of Hygrosoma Pefers?/'\ a. section of a priniar\' actinal 



spine, b. of an abactinal spine. Obj. II. Oc. I. 



— 5. Piece of transverse section of spines of Calveria hystrix\ a. section of a primary actinal spine, 



b. of an abactinal spine. Obj. II. Oc. I. 



— 6. Transverse section of a primary spine of Hypsiechimis coronatiis. Obj. II. Oc. III. 



— 7. Piece of transv'erse section of spines of Phormosoma placenta ; a. section of an abactinal spine, 



b. of a primary actinal spine, lower part. Obj. II. Oc. I. 



— 8. Piece of transverse section of a primary spine of Arceosoma fenestratjini. Obj. II. Oc. I. 



— 9. — - — — - spines of Sperosoma Griinaldii\ a. section of a primary actinal 



spine, b. of an abactinal spine. Obj. II. Oc. I. 



— 10. Transverse section of a primary actinal spine of Phonnosonia placenta^ outer part. The out- 



line indicates the circumference of the bag of skin. Obj. II. Oc. I. 



— II. Spicule of a tube foot of Araosonia tesselatitm. Obj. II. Oc. III. 



— 12. a. b. Spicules from tlie organs of Stewart of Stereocidai'is ingolfiana. Obj. II. Oc. I. 



— 13. Spicules of a tube foot of Troimkoso^na Koekleri. Obj. II. Oc. I. 



— 14. Piece of transverse section of a primary spine of Dorocidaris papillata^ }oung specimen. 



Obj. II. Oc. o. 



— 15. Spicules of a tube foot of Arceosoma coriaceHvi\ a. from the outer, b. from the lower part 



Obj. II. Oc.III. 



— 16. a — d. Spicules of the genital organs of Stereocidaris ingolfiana. Obj. II. Oc. I. 



— 17. Piece of a primary spine of a }oung Stereocidaris i^igolfiana. Obj. 00. Oc. o. 



— 18. Spicules of a tube foot, lower part, of Kamptosoma asterias («Ph. tenue». Chall. St. 272). 



Obj. II. Oc. I. 



— 19. Spicules of a tube foot of Hapalosoma pelluciduv!. Obj. II. Oc. III. 



— 20. — — — - Asthenosoma varium. Obj. II. Oc. III. 



— 21. — — — - Porocidaris putpiirata. Obj. II. Oc. I. 



— 22. — — — - Cidaris affinis; a. from tlie outer, b — c. from the lower part. 



Obj. II. Oc. I. 



— 23. Piece of the intestine, with imbedded spicules, of Stereocidaris ingolfiana. Obj. II. Oc. I. 



— 24. — - transverse section of a primary spine of Dorocidaris (?) micans. Ol^j. II. Oc. I. 



— 25. Spicules of an abactinal tube foot of Plwrmosoma placenta. Obj. II. Oc. I. 



— 26. a — d. — of a tube foot of Dorocidaris papillata. Obj. II. Oc.III. 



— 27. — — — - Hygrosoma Petersii. Obj. II. Oc. I. 



— 28. a — d. — — — - Stereocidaris ingoljiaiia. Obj. II. Oc.III. 



— 29. — — — - Calveria kystrix. Obj. II. Oc. III. 



— 30. Piece of a primary spine with the crest of a young Stereocidaris ingolfia7ia. Obj. 00. Oc. o. 



— 31. — - transverse section of a primar>- spine of Dorocidaris papillata., larger specimen. 



Obj. II. Oc.o. 



— 32. Piece of the crest of a primar\' spine of Stereocidaris ingolfiana. Obj. II. Oc.o. 



— 33. — - transverse section of a primary spine of Stereocidaris ingolfiana. Obj. II. Oc. I. 



