REFERENCE TO PLATES. 419 



PLATE 29. 



FIGURE. PAGE. 



1-3. Cylichna chevreuxi Dautz. Camp. Sci., . . . 291 

 4-7. Cylichna richardi Dautz. Camp. Sci., .... 293 

 8-10. Retusa crossei B. D. & D. Moll. Rouss. . . .211 

 11. Retusa umbilicata Mont. Sars., ..... 210 

 12-14. Retusa umbilicata Mont. Moll. Rouss., . . . 210 

 15-17. Cylichna cylindracea Penn. Moll. Rouss., . . 289 



PLATE 30. 



I, 2, Cylichna noronyensis Wats. Chall. Rep., . . . 301 

 3, 4. Cylichna labiata Wats. Chall. Rep., . . . .313 

 5, 6. Cylichna reticulata Wats. Chall. Rep., . . . 316 



7. Cylichna discus Wats. Chall. Rep., 299 



$, 9. Cylichna subreticulata Wats. Chall. Rep., . . .317 

 10. Cylichna tahitensis Wats. Chall. Rep., . . . .320 



II. Retusa ovata Jeffr. Chall. Rep., . . . . . 232 



12. Cylichna crispula Wats. Chall. Rep., . . . .315 



PLATE 31. 



13, 14. Scaphander mundus Wats. Chall. Rep., . . .251 



15. Scaphander niveus \\ r ats. Chall. Rep., .... 252 



16. Scaphander punctostriatus Migh. Sars., . . . 246 



17. Scaphander lignarius L. Sars., ..... 245 



18. Scaphander watsoni Dall. Blake Rep., .... 248 



19. 20. Scaphander gracilis Wats. Chall. Rep., . . .247 

 21, 22. Scaphander lignarius L. Moll. Esp., . 245 



23. Scaphander lignarius L. Moll. Rouss., . .. . . 245 



PLATE 32. 



24, 25. Scaphander lignarius L., 245 



26. Scaphander interruptus Dall. Proc. U. S. Nat. Mus. . 250 



27, 28. Scaphander bathymophila Dall. Blake Rep., . . 256 

 29, 30. Atys gibbulus Jeffr. diaphana Arad. Ann. Mag. 278 

 31, 32. Scaphander nobilis Verril. Tr. Conn. Acad., . . 249 

 33, 34. Scaphander issellii Bell. Bull. Soc. Mai. Ital., . . 255 



35. Atys sandersoni Dall. Blake Rep., .... 275 



36. Atys hyalina Wats. Chall. Rep .271 



37. Atys freyi Brancsik = naucum L., . . . . . 264 



38. 39. Diaphana seguenzce Wats. Chall. Rep., . 



PLATE 33. 



40, 41, Smaragdinella andersoni Nev. J. A. S. B., . . 260 



42. Smaragdinella glaucii = viridis. Thes., .... 258 



43, 44. Smaragdinella glaucii Q, & G. Astrol., . . .259 



