REFERENCE TO PLATES. 



PLATE 1. 



FIGURED PAGE. 



j. Neritopsis radula, Linn. Portion of radula. Fischer's 



Manual, f. 568, 12 



2. Navicella clypeolum. Dentition, Troschel, Gebiss der 



Schnecken ii, t. 16, f. 1, 10 



3. Neritina reclivata, Say. Dentition. Ibid, ii, t. 16, f. 10, . 6 



4. Cyclostrema basistriatum, Jeffr. Dentition. Ibid, ii, t. 2, 



f. 3, . . 14 



5. 6. Peltarion bilobatus, Desh. Operculum. Fischer's 



Manual, f. 569, 12 



7, 8. Neritopsis radula, Linn. Operculum. a, external face, 



b, internal face. Fischer's Manual, f. 570, . . .12 

 9, 10. Neritina. Operculum, 9 internal, 10 external face. 



Fischer's Manual, f. 563, 561, 6 



11, 12. Navicella operculum, b, internal, a, external face. 



Ibid. f. 566, 10 



13. Naticopsis placida, Kon. Operculum. Ibid. f. 572, . 12 



14. Naticopsis planispira, Kon. Operculum. Ibid. f. 573, . 12 



15. Nerita peloronta, Linn. Showing absorption of inner 



walls. Ibid. f. 559, 18 



16. Neritina zigzag, Lam. Showing apophysis. Ibid. f. 562, 5 



17. Naticopsis ampliata, Koninck. Ibid. f. 571, . . .12 



18. Craspedostoma elegantulum, Lindstr. Ibid. f. 588, . 17 



19. 20. Crossostoma reflexilabrum, d'Orb. Ibid. f. 589, . 17 



PLATE 2. 



21-23. Nerita albicilla, L. Reeve, Conch. Icon. f. 64, . 19 



24. Nerita venusta, Phil. ( = albicilla, L.) Phil. Abbild. 



i, t. 1, f. 11, 19 



25, 26. Nerita forskalii, Reel. ( albicilla.) Reeve, Nerita, 



f. 67, 19 



27. Nerita plexa, Chemn. Ibid. f. 12, ... . 19 



28. Nerita chlorostoma, Lam. ( == plexa, Chemn.) Ibid. f. 



32,6, 19 



29. Nerita exuvia, L. Ibid. f. 1, a, . . . , . 19 



30. Nerita granulata, Rve. Ibid. f. 79, a, . . . . 20 

 :U-33. Nerita stella, Chemn. ( = chamaeleon.) Ibid. f. 60, . 20 

 34-36. Nerita squamulata, Le Guill. (= chamaeleon.) Ibid. 



f.63, . . . ... 20 



PLATE 3. 



37. Nerita modesta Hombr. et Jacq. (= chamaeleon.) Voy. 



Astrol. et Zel. t. 16, f. 6, 20 



(291) 



