46 



INDEX OF SPECIES. 



Cyrena 



Mexicana, 27, 164, i, 175, 

 O 24S, 281, 308, P 115. 



Mexicana, var. 227, O 232. 



altilis, U 202. 



olivacea, 27, 164, 248. 281, 

 O 308, P 114, P "6. 



Panamensis, 164. 



placens, P 114. 



pullastra, 164. 



radiata, 164. 



Reuluzii, 164, 



solida, 60, 164, 2S1, 309. 



sordida, 164. 



subquadrata, 164, 2S7, 309. 



triangula, 164, 



tumida, 164. 



varians, 164, P 115. 

 Cyrenoida 



seriicata, P 104. 

 Cyrtopleura 



trunuata, 121. 

 Cyrtulus 



dir^tortus, 231. 



patulus, P 501. 

 Cytherea 



sequilatera, 203, 246, P 549. 



affiiiis, 201, 185, 191,0 229, 

 247, 278, P 69. 



alternata, 247, 289, P 69. 



argentina, 185, O 236, P 539. 



arguta, 60. 



aurantia, 174, 229, 278. 



aurantiaca, 47, 201, 246, 

 278, P 63. 



biradiata, 9, 211, 236, 

 246, 366, P 64. 



brevispina, 281. 



brevispinosa, 289, P 69. 



callosa, 12, 279, 197, V 216. 



casta, P 70. 



castanea, P 70. 



chione, O 211, 289, P 64. 



chionaea, 236, P 64, P 539. 



circinata, 2S9, P 69. 



conciuna, O 1S5, P 69. 



Cytherea 



consanguiuea, 5S, 201, 278. 

 corbiculA, 246, P 54, P 55, 



P539. 

 crassatelloides, 58,0 196,0 207, 



P 58, V 216. 

 Darieua, 80. 

 decisa, 77. 

 Dione, var. 61, 1S5, 246, 



28s, P 67. 

 Dunkeri, 60. 

 elegaus, 246, P 64. 

 erjcinoides, V 216. 

 foimosa, P 70. 

 fusca, P 70. 

 gigaiitea, 39, 60, 246, 289, 



P 60. 

 gracilior, 58, 246, P 55. 

 gvapliica, P 70. 

 Guineensis, P 69. 

 Hindsii, 246, P 55. 

 impudica, P 70. 



intermedia, 246, 289, P 55. 

 Iseta, 58. 

 lepida, 246. 

 ligula, 58. 

 lupiuaria, 6, 1S5, 229, 



284, P 67. 

 lusoria, P 70. 

 lutea, 58. 

 mactroides, 60, 246, P 55, P 



59- 

 meretrix, 58, P 70. 

 morphiua, P 70- 

 nitidula, 58. 

 nobilis, 12, 106, 280. 

 ovnm, P 70. 



Pacifica, 60, 246, P 55. 

 petechialis, 69, 202, 247, 



305, 366, P 70. 

 lauulata, 47,0 176,0 189, P59. 

 punctata, P 97. 

 radiata, 58, 201, 191, 278. 

 rosea, 175. 

 semifulva, 236, 246, P 55, 



P539. 



