INDEX. 
Synonyms are printed in z¢adics, 
‘genera, subgenera, families, etc., in 
SMALL CAPITALS; the page number indicating reference to a diagnosis is 
in 2talics. 
AGNATHBA, J69. 
AGNATHOMORPHA, 7712. 
AGRIOLIMAX, 195, 708. 
Agriolimax campestris, 194, 195, zgo. 
ALASMIDONTA, 392 
Alasmidonta truncata, 392. 
ALASMODONTA, 56, 100. 
Alasmodonta complanata, 57, 58, 60. 
deltoidea, 57, 67, 64. 
marginata, 57, 62, 63, 64. 
pressa, 51, $8, 60, 73. 
rhombica, 67. 
rugosa, 57, 58, 59, 60. 
ALBINULA, 232. 
ALEXIA, 256. 
AMNICOLID&, 327. 
AMNICOLA, 370, 331, 339, 348, 346. 
Amnicola attenuata, 338. 
cincinnatiensis, 
336, 337. 
emarginata, 331, 376. 
Serruginea, 331. 
depressa, 341. 
limosa, 33, 3??7-336, 361. 
lustrica, 331, 334, 335, 337. 
orbiculata, B34. s! 
parva, }?4. 
sayana, 335. 
porata, 301, 334. 
shrokingeri, ce 
walkeri, zoo. 
ANCYLID2, 702. 
ANCYLUS, 702, 303, 306, 307. 
Ancylus fluviatilis, 303. 
obliguus, 306. 
re 303, 304, 305, 306, 
shimekii, 303, 706. 
tardus, 303, 705. 
Anatomy of the shel), 36. 
Anguispira, 204. 
Angustula, 2A1. 
ANISOPLEURA, /38. 
ANODONTA, 48, 19, 50, 69, 100. 
Anodonta annu/ata, 67. 
arkansasensts, 67. 
declivis, 51. 
decora, 51, 
footiana, 51,53, 54, 55. 
gigantea, 51, ; 
grandis, 49, 50, 57, 54, 55, 75. 
harpethensts, 51. 
381, 725, 
Anodonta ordea, 55. 
imbecilis, 51, 55. 
incerta, dd. 
tnornata, dl. 
mc netlit, 54. 
marryattana, 54. 
opalina, 54. 
ovata, 51. 
plana, 51, 807. 
salmonia, 51. 
shafferiana, 67. 
subangulata, 54. 
tetragona, 67. 
waratana, 69. 
ANODONTOIDES, 72. 
Anodontoides ferussacianus, 65, 72, 74, 
75. 
subcylindraceus, 65, 74. 
Anodontopsis, 72. 
Anoplophrya vermicularis, 361. 
APLEXA, 3/7. 
Aplexa hypnorum, 377, 318. 
Appendix, 391. 
Arion, 203. 
Aspidogaster conchicola, 48. 
AULACOPODA, /74. 
AURICULID&, 253. 
BASOMMATOPHORA, 253. 
Bibliography, 366 
BIFIDARIA, 220, 231. 
Bifidaria Steet 228, 272, 233, 236, 
4. 
ray 228, 274, 235, 286, 
ise 
: corticaria, 227, 229, 230. 
cristata, 231. 
curvidens, 185, 228, 239, 240. 
holzingeri, 228, 276, 257. 
pentodon, 228, 278, 239, 240. 
procera, 227, 277, 232. 
ruidosensis, 282. 
Bulimnea, 260. 
Bulimus lubricotides, 246. 
Bulinus tryoni, 317. 
Bulla fluviatilis, 288. 
BYTHINIA, 328, 330. 
Bythinia tentaculata, 728, 329. 
Bythinella nickliniana, 33, 
CALYCULINA, 720. 
Calyculina partumeia, 113, 723, 124. 
