STSTEIiTIC INDEX. 



1. 



2. 

 3. 

 4. 

 5. 

 6. 

 7. 

 8. 

 9. 

 10. 



11. 



12. 



13. 



Page 

 COBBICrLAD^. 1 



CorI>icula, Megekle. 2 



Corbicula convexa, Desh. 3 

 Corbicula paranensis, Desh. 3 

 Corbicula obsoleta, Desh. 

 Corbicula rotunda, Prime. 

 Corbicula limosa, Desh. 

 Corbicula cuneata, Desh. 

 Corbicula brasiliana, Desh 

 Corbicula perplexa, Privie. 75 

 Corbicula truncata, Prime. 7 

 Corbicula moreauensis, 



M. Sr H. 1 

 Corbicula nebrascensis, 



M. ^ H. 8 

 Corbicula occidentalis, 



M. cy H. f 

 Corbicula cytheriformis, 



M. ^' H. { 



19 

 20 

 20 

 21 

 21 

 22 

 23 



Cyrena, Lamakck. 



11 



14. Cyrena caroliniensis, Z-am- 12 



15. Cyrena sordida, Han. 



16. Cyrena radiata, Han. 



17. Cyrena solida, Phil. 



18. Cyrena triangula, Busch. 



19. Cyrena obscura, Prime. 



20. Cyrena insignis, Desh. 



21. Cyrena arctata, Desh. 



22. Cyrena fortis, Prinie. 



23. Cyrena olivacea, Cpr. 



13 

 13 

 14 

 14 

 15 

 15 

 16 

 17 

 17 



Page 



24. Cyrena regalis, Prime. 18 



25. Cyrena meridionalia, Prime. 



19 



26. Cyrena ordinaria, Prime. 



27. Cyrena nitidula, Desh. 



28. Cyrena placens, Han. 



29. Cyrena fontaineii, Orb. 



30. Cyrena acuta, Prime. 



31. Cyrena mexicana, Sow. 



32. Cyrena californica, Prime 



33. Cyrena panamensis, Prime. 24 



34. Cyrena recluzii, Prime. 24 



35. Cyrena cumingii, Desh. 25 



36. Cyrena isocardioides, Desh. 



25 



37. Cyrena tumida, Prime. 



38. Cyrena pullastra, March. 



39. Cyrena inflata, Phil. 



40. Cyrena boliviana, Phil. 



41. Cyrena maritima, Ad. 



42. Cyrena notabilis, Desh. 



43. Cyrena floridana, Conr. 



44. Cyrena cubensis, Prime. 



45. Cyrena salmacida, Mrl. 



46. Cyrena colorata, Privie. 



47. Cyrena anomala, Desh. 



48. Cyrena densata, Conr. 



49. Cyrena dakotensis, M. &^- 



26 

 26 

 26 

 27 

 27 

 28 

 28 

 29 

 29 

 30 

 30 

 31 



Sphaerium, Scopoli. 32 



50. Sphaerium sulcatum, Lam. 33 



51. Spheerium aureum, Prime. 35 



(ix) 



