64 



animal and the shell. The description above quoted, from the observations 

 of M. Deshayes, informs us that there is a peculiarity in the structure of 

 the disc, beautifully illustrated by M. Quoy in the ' Voyage de T Astrolabe ', 

 in having the front extremity furnished with two ear-shaped appendages, 

 and the hind part bifurcated, the corners presenting a tentacle-like ap- 

 pearance. 



There is a singular uniformity in the form and colour of the shells of 

 Nassa ; they are all small, and mostly distinguished by a remarkably thick- 

 ened deposit of enamel in the vicinity of the aperture. 



Some time after Lamarck introduced the genus Nassa, he abandoned it 

 except as a sectional division of the Buccina ; the generic peculiarities of 

 this comparatively extensive group were, however, too obvious to escape 

 attention. 



They are confined to the southern and tropical regions. 



1. abbreviata, Desk. 



2. achatina, id. 



3. acuta, Say. 



4. ampullacea, Desk. 



5. annulata, id. 



6. arcularia, Lam. 



7. Ascanias, Desk. 



8. attenuata, Gray. 



9. Belangeri, Desk. 



10. callosa, Gray. 



11. canaliculata, Desk. 



12. can dens, Hinds. 



13. coccinella, Besh. 



14. complanata, Fowls. 



15. concinna, id. 



16. conoidalis, Besh. 



17. coronata. Lam. 



18. crenata, Llinds. 



19. crenulata, Besh. 



20. dentifera, Powis. 



21. exilis, id. 



22. fasciata, Besh. 



23. fasciolata, id. 



Species. 



24. festiva, Powis. 



25. gaudiosa, Hinds. 



26. gemmulata, Besh. 



27. gibbosula, Lam. 



28. glans, Besh. 



29. globosa, id. 



30. grana, id, 



31. granifera, id. 



32. Grayi, id. 



33. inflata, id. 



34. limata, id. 



35. luteostema,^r. ^(Sb?/;. 



36. marginulata. Lam. 



37. msesta. Hinds. 



38. Melanoides, Besh. 



39. miga, id. 



40. muricata, Qiwy. 



41. mutabilis, Besh. 



42. myristicata, Hinds. 



43. neritea, Lam. 



44. nodata, Hinds. 



45. nodifera, Powis. 



46. obsoleta, Say. 



47. olivacea, Besh. 



48. Ohvseformis, id. 



49. pallida, Powis. 



50. papillosa, Sow. 



51. pauperata, Lam. 



52. pei-pinguis. Hinds. 



53. pohta, Besh. 



54. polygonata. Lam. 



55. pulla, id. 



56. reticulata, Besh. 



57. retusa, id. 



58. Eoissyi, id. 



59. scabriuscula, Powis. 



60. stolata, Besh. 



61. subspinosa, id. 



62. sutiiralis, id. 



63. texta, id. 



64. Thesites, Lam. 



65. tricarinata, Besh. 



66. trivittata. Say. 



67. unicincta, id. 



68. vibex, id. 



Figure. 

 Nassa luteostoma. Plate 3. Fig. 11. — From Mr. Cuming's collection. 



