INDEX. 



Synonyms are printed in italics ; genera, subgenera, families, etc., in 

 SMALL CAPITALS; the page number indicating reference to a diagnosis is 

 in italics. 



AGNATHA, i6g. 

 AGNATHOMORPHA, 777. 

 AGRIOLIMAX, 195, ig8, 

 Agriolimax campestris, 194, 195, 799. 

 ALASMIDONTA, 392 

 Alasmidonta truncata, 392. 

 ALASMODONTA, 56, 100. 

 Alasmodonta complanata, 57, 58, 60. 

 deltoidea, 57, 63, 64. 

 marginata, 57, 62, 63, 64. 

 pressa,57,j<S, 60, 73. 

 rhombica, 67. 

 rugosa, 57, 58, 59, 60. 

 ALBINULA, 232. 

 ALEXIA, 256. 

 AMNICOLID^E, 327. 

 AMNICOLA, 330, 331, 339, 343, 346. 

 Amnicola attenuata, 338. 



cincinnatiensis, 331, ??5, 



336, 337. 



emarginata, 331, j>jd. 

 ferniginea, 331. 

 depressa, 341. 

 limosa, 33, ?? 7-336, 361. 

 lustrica.331, 334, 335, 337. 

 orbiculata, 334. 



sayana, d3o. 

 porata, 331, 334. 

 shrokingeri, 331. 

 walkeri, 409. 

 ANCYLID^E, 302. 

 ANCYLUS, 302, 303,306, 307. 

 Ancylus fluviatilis, 303. 

 obliquus, 306. 

 rivularis, 303, 304, 305, 306, 



307. 



shimekii, 303, 306. 

 tardus, 303.JW. 

 Anatomy of the shell, 36. 

 Anguispira, 204. 

 Angustula, 241. 

 ANISOPLEURA, 138. 

 ANODONTA, 48, 49, 50, 69, 100. 

 Anodonta annu/ata, 67. 



arkansasensis, 67. 



decli-uis, 51. 



decora, 51. 



footiana, 51,53,5^, 55. 



gigantea, 51. 



grandis.49,50,57,54, 55,73. 



harpethensis , 51. 



Anodonta hordea, 55. 



imbecilis, 



incerta, 55. 



inornata, 51. 



me neilii, 54. 



marryattana, 54. 



opalina, 54. 



ovata, 51. 



plana, 51, 307. 



salmonia, 51. 



shajferiana, 67. 

 ' subangulata, 54. 



tetragona, 67. 



ivardiana, 69. 

 ANODONTOIDES, 75. 

 Anodontoides ferussacianus, 65, 7^, 74, 



75. 



subcylindraceus, 65, 7/. 

 Anodontopsis, 72. 

 Anoplophrya vermicularis, 361. 

 APLEXA, j>77. 



Aplexa hypnorum, J77, 318. 

 Appendix, 391. 

 Anon, 208. 

 Aspidogaster conchicola, 48. 



AULACOPOUA, 77^f. 



AURICULID.E, 253. 



BASOMMATOPHORA, 253. 

 Bibliography, 366. 

 BIFIDARIA, 229, 231. 

 Bifidaria armifera, 228, 232, 233, 236, 

 237. 



contracta, 228, 234, 235, 236, 

 237. 



corticaria, 227, 229, 230. 



cristata, 231. 



curvidens, 185, 228, 2W, 240. 



holzingeri, 228, 236, 237. 



pentodon, 228, 238, 239, 240. 



procera, 227, 231, 232. 



ruidosensis, 232. 

 Bulimnea, 260. 

 Bulimus lubricoides, 246. 

 Bulinus tryoni, 317. 

 Bullafluviatilis, 288. 

 BYTHINIA, 328, 330. 

 Bythinia tentaculata, 328, 329. 

 Bythinella nickliniana, 33. 



CALYCULINA, 120. 



Calyculina partumeia, 113, 123, 124. 



