PROCEEDINGS OF THE NATIONAL MUSEUM. 



203 



MOLLUSKS OF THE TRES MARIAS ISLANDS. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 1.5. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 

 27. 

 28. 

 29. 

 30. 

 31. 

 32. 



33. 

 34. 

 35. 

 36. 

 37. 

 38. 

 39. 

 40. 

 41. 

 42. 

 43. 

 44. 



Mytilns multiformis, Cpr. 

 Byssoarca miitabilis, Sby. 

 Venericardia flammea, Mich. 

 Cardita crassa, Gray. 

 Chione undatella, Sby. 

 Psammobia regulaiis, Cpr. 

 Orthalicus undatiis, Brug. 

 O. tiudatus var. = ? O. mclanochei- 



lu8, Val. 

 Siphouaria lecanium, Phil. 

 Conns Dalli, Stearns. 

 Conns vittatus, Lam. 

 Conns pnrpnrascens, BroiL 

 Conns gladiator, Brod. 

 Conns brunnens, Wood. 

 Conns brnnnens var.=tiaratus, Brod. 

 Conns nnx, Brod. 

 Oliva vennlata, Lam. 

 Oliva splendidnla, Sby. 

 Olivella cyanea Reeve, var. 

 Harpa crenata, Rnmph. 

 Solenosteira moditicata, Rve. 

 Mitra lens, Wood. 

 Leucozonia cingnlata, Lam. 

 Latirus ceratns, Wood. 

 Nassa corpnlenta, C. B. Ad, 

 Nassa Inteostoma, Brod and Sby. 

 Coliimbella fuscata, Sby. 

 Anachis coronata, Sby. 

 Nitidella cribraria, Lam. 

 Meta cedonnlli, Rve. 

 Strombina macnlosa, Sby. 

 Chicoreus palma-roste m ex lean a, 



Stearns. 

 Pnrpnra patula, Linn.Tpiis. 

 Purpnra columellaris, Lam. 

 Monoreras tnbemilatnm, Gray. 

 Monoceras Ingubri.s, Sby. 

 Rhizochilns, nnx, Rve. 

 Triton vestitum, Hds. 

 Cassis vibex-mexicana, Stearns. 

 Levenia coarctata, Sby. 

 Oniscidia tubercnlosa, Rve. 

 Cypra-a isabeUa-mexicana, Stearns. 

 Cypriea albnginosa, Mawe. 

 Cypriea aral>icula, Lam. 



45. Trivia sanguinea, Gray. 



46. Trivia radians. Lam. 



47. Trivia pnlla, Gask. 



48. Pustularia pustnlata, Lam. 



49. Stronibns galeatns. Wood. 



50. Cerithiura maculosnm, Kien. 



51. Cerithium incisum, Sby. 



52. Clava gemmata, Hinds. 



53. Modnlns (erodes, A. Ad. 



54. Modnlns discnins, Phil. 



55. Modnlns catcnnlatns, Phil. 



56. Petaloconchns macrophragma, Cpr. 



57. Littorina couspersa. Phil. 



58. Torinia variegata, I>am. 



59. Crucibnlnni imbricatnm, Sby. 



60. Crncibnlnm spinosnm, Sby. 



61. Crepidnla nngniformis. Lam. 



62. Crepidnla dorsata var. ligulata, Ged. 



63. Galerus m ami liar is, Brod. 



64. Amalthea barbata, Sby. 



65. Amalthea serrata, Cpr. 



66. Natica excavata, Cpr. 



67. Natica zonaria, Cpr. 



68. Natica Pritchardi, Fbs. 



69. Lnnatiai otis, Brod and Sby. 



70. Lnnatia otis var. fusca, Cpr. 



71. Neverita Reclnziana, Rve. 



72. Acmaja pedicnlns, Phil. 



73. Acmsea fascicnlaris, Mke. 



74. Acmsea discors, Phil. 



75. Acmsea atrata, Cpr. 



76. Scnrria mesolenca, Mke. 



77. Scnrria mesolenca var. ? = vespertina, 



Rve. 



78. Patella Mexlcana, Brod and Sby. 



79. Phasiauella perforata, Phil. 



80. Senectns sqnamiger, Rve. 



81. Calloponia tlnctnosus, Wood. 



82. Chlorostonia gallina, Fbs. 



83. Omphalins globnlns, Cpr. 



84. Nerita Bernhardi, Recluz. 



85. Fissurella volcano, Rve. 



86. Fissuridea mnrina, Cpr. 



87. Fissnridea inaiqnalis, Sby. 



88. Fissuridea, ina'qualis var. pica, Sby. 



89. Fissuridea alta, C. B. Ad. 



It will be seen that the tbregoiug segregation includes 89 species and 

 varieties of the 294 contained in the general catalogue. The island list 

 is apparently small conipared with the latter, and still smaller when 

 compared with the number of species known to exist in the Mazatlan 

 and Panama province. It should, however, be borne in mind that no 

 special eftbrt was made to investigate the Mollusk fauna of the Tres 

 Marias and that the species collected in this little group of islands 



