Xlll 



INDEX TO THE GENERA. 



Referring to Plates and Figures. 



Achatina, xxiv. 24. 

 Aclis, xit. 23, 25. 

 Acmsea, x. 22, 23. 

 Acme, xxiv. 26. 

 Adeorbis, xi. 25. 

 Akera, xx. 16. 

 Ampliispira, xx. 14, 15. 

 Ancylus, xxi. 14-17. 

 Anodonta, vn. 4. 

 Anomia, vin. 18-21. 

 Aplysia, XX. 28. 

 Aporrhais, xv. 4, 5. 

 Area, vin. 8-12. 

 Argiope, ix. 20, 23. 

 Artemis, iv. 10, 11. 

 Assiminea, xiii. 1, 2. 

 Astarte, iv. 17, 22. 

 Avicula, vin. 15. 

 Azeca, xxiv. 23. 



Balea, xxiv. 17. 

 Barleeia, xiv. 12. 

 Bithinea, xn. 6, 7. 

 Buccinum, xvin. 8-13. 

 Bulla, xx. 17-19. 

 Bulimus, xxiv. 1-4. 



Calyptraea, x. 29. 

 Capulus, Pileopsis. 

 Cardium, v. 4-13. 

 Carychium, xxn. 8. 

 Caecum, xv. 6-7. 

 Cemoria, Puncturella. 

 Ceratisolen, II. 11 



Cerithiopsis, xv. 11-15. 

 Cerithium, XV. 8-10. 

 Chemnitzia, xvi. 1-11. 

 Chiton, x. 5-17. 

 Circe, v. 2. 

 Clavatula, Mangelia. 

 Clausula, xxiv. 18-21. 

 Clausina, v. 20-22. 

 Cochlodesma, n. 10. 

 Conovulus, xxii. 4-7. 

 Corbula, I. 22-24. 

 Crania, ix. 24. 

 Crenella, vn. 12-17. 

 Cyclostoma, xxiv. 25. 

 Cyclas, vi. 16-20. 

 Cylichna, xx. 4-13. 

 Cypraea, xix. 28. 

 Cyprina, v. 1. 

 Cytherea, iv. 23. 



Dentalium, x. 26, 27. 

 Diodonta, II. 16, 16*. 

 Diplodonta, v. 19. 

 Donax, ill. 19, 20. 

 Dreissina, vn. 5. 



Emarginula, xi. 4-6. 

 Euomphalus, xiv. 17, 18. 

 Eivillia, in. 17. 

 Eulima, xv. 22-26. 

 Eulimella, xiv. 26-30. 



Fissurella, xi. 1, 2. 

 Fusus, xviii. 14-19. 



