REFERENCE TO PLATES. 



419 



Plate 29. 



FIGURE. 



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

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

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

 11. Retusa umbilicata Mont. Sars., 

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

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



PAGE. 



. 291 

 . 298 

 . 211 

 . 210 

 . 210 

 . 289 



Plate 30. 



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

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

 5, 6. Cylichna reticulata AVats. Chall. Rep., 



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



8, 9. Cylichna subreticulata AVats. Chall. Rep., 

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



II. Retusa ovata JefFr. Chall. Rep., 



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



Plate 31. 



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



15. Scaphander niveus Wats. Chall. Rep., . 



16. Scaphander punctostriatus Migh. Sars., 



17. Scaphander lignarius L. Sara., 



18. Scaphander watsoni Dall. Blake Rep., . 



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

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

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



Plate 32. 



301 

 313 

 316 

 299 

 317 

 320 

 232 

 315 



251 



252 

 246 

 245 

 248 

 247 

 245 

 245 



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. Ittil., . . 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 seguenza? Wats. Chall. Rep., . . .282 



Plate 33. 



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



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



43, 44. Smaragdinella glaucii Q. & G. Astro!., . . . 259 



