151 



list of the species is from the last edition of Lamarck. A monograph of 

 the genus is much needed. 



1. acicula, Soiv. 



2. acuta, Besm. 



3. alba, Forbes. 



4. arata, Recluz. 



5. Bruguierei, Payrffl«<(?. 



6. Bryerea, Macgill. 



7. Buccinoides, Besh. 



8. cancellata, RecUiz. 



9. Cliesnetii, MicJiaud. 



10. cingillata, Macgill. 



11. cingulus, Michaud. 



12. costata, Recluz. 



13. crenulata, Michaud. 



14. cyclostomata, Recluz. 



15. deformis, Sow. 



16. Desliayesiana, Recluz. 



17. Desmarestii, id. 



18. elongata, Phil. 



19. excavata, id. 



20. fragilis, Michaud. 



21. fill V a, z^. 



22. Gougeti, ^■c?. 



Species. 



23. graciUs, Macgill. 



24. grossa, Michaud. 



25. Guerinii, Recluz. 



26. hyaUiia, Besm. 



27. Inca (i(!mm'wa), D'Or. 



28. interrupta, Johnston. 



29. labiata, P/««7. 



30. lactea, Michaud. 



31. lilacina, Recluz. 



32. lineolata, Michaud. 



33. marginata, Z6?. 



34. Matoniana, Recluz. 



35. minutissima, ilfic/i. 



36. monodonta, PM. 



37. Montagui, Tayraud. 

 38.'muriatica, Macgill. 



39. oblonga, Besm. 



40. parva, Recluz. 



41. praeusta, z'c?. 



42. pulchella, P7m7. 



43. punctulum, z¥. 



44. punctuxata, Macgill. 



45. pusilla, i)es/^. 



46. pygmaea, Michaud. 



47. radiata, P/m7. 



48. reticulata, Sow. 



49. rubra, Macgill. 



50. scalari s, ilfic^awf?. 



51. semistriata, Johnston. 



52. spirata, /S'o2<7. 



53. Souleyetana, Recluz. 



54. striata, Qwoy. 



55. striata, Macgill. 



56. striatula, Recluz. 



57. subumbilicata, Jf«c. 



58. tridentata, Michaud. 



59. tristriata, Thompson. 



60. truncata, Macgill. 



61. ulvse, it?. 



62. unifasciata, Recluz. 



63. ventricosa, Desw?. 



64. ventricosa, Macgill. 



65. violacea, Besm. 



66. vittata, Recluz. 



Figure. 



RissoA CuMiNGii. PI. 15. Kg. 75. Shelly showing the aperture with 

 its thickened lip and sinuated formation at the upper part. 



Family 8. PLICACEA. 



Shell ; distingvAslied by having the columella strongly plaited and 

 the base entire without indication of any sinus, the animal 

 being of marine habits, and furnished with a horny operculum. 



Little is known of the soft parts of this family beyond the external form 

 of Pyramidella described by M. Quoy in the ' Voyage de 1' Astrolabe"^/ 



* Comme on le voit, rien n'est encore connu snr Torganisation interieure dea Pyramidelles ; 



