Pleurocera elevatum, 320, 321, 322, 324, 



325,330. 

 intensum, 322. 



subulare, 320, 322-326. 

 PLEUROCERID^;, 319. 

 Polita, 177. 



POLYGYRA, 140, 141, 142. 

 Polygyra alba, 148, iji, 163. 



albida, 165. 



albolabris, 39, 41, 139, 142, 

 757, 153-156. 



alicse, 165. 



alleni, 151. 



altispira, 163. 



andrewsi, 142. 



bidentata. 144. 



clausa, 142, 143, 158, 161. 



complanata, 144. 



dentata, 154. 



edentilabris, 144. 



exoleta, 142, 134, 155. 



fraterna, 167, 168. 



fraudulenta, 143, 144, 146, 

 147. 



friersoni, 165. 



hirsuta, 143, 163, 164. 



imperforata, 165. 



inflecta, 143, 146. 



introferens, 147, 148. 



juxtigens, 144. 



maritima, 151. 



minor, 151. 



monodon, 139, 143, 164, 165, 

 166, 167. 



multilineata, 142, 151, 161. 



pennsylvamca, 142, 759, 160. 



pilula, 163. 



profunda, 139, 142, 148, 149, 

 150, 151, 161, 162, 163. 



pulchella, 151, 156. 



sanctisimonis, 156. 



rubra, 163. 



thyroid. ?, 139, 142, 152, 153, 

 j 5 6, 157, 158, 159, 168. 



tridentata, 42, 143, 144, 145, 

 146, 147. 152. 



uncifera, 163. 



unidentata, 144. 

 POMATIOPSIS, 269, 343, 346. 

 Pomatiopsis cincinnatiensis, 335, 343, 



344, 346. 

 lapidaria, 336, 343, 344, 



345. 



PRIONODESMACEA, 46. 

 PRIVATULA, 229. 

 PSEUDOHYALINA, 189. 



PUNCTUM, 214. 



Punctum minutissima, 215, 216. 



pygmaeum, 185, 215, 216. 

 PULMONATA, 138. 

 PUPA, 225, 240. 



Pupa arizonensis, 228. 

 armigera, 232. 

 carinata, 231. 

 curta, 238. 

 deltostoma, 234. 

 fallax, 228. 

 fordiana, 236. 

 floridana, 239. 



gracilis, 239. 

 hordeacea, 231. 

 minuta, 231. 

 modes ta, 242. 

 montanella, 238. 

 ovulum, 242. 

 pellucida, 231. 



tappaniana, 238. 



PUPOIDES, 228. 



Pupoides marginatus, 227, 228. 

 PYRAMIDULA, 204, 205, 225. 

 Pyramidula alba, 210. 



alternata, 151, 168, 189, 

 205, 206, 207, 211, 212. 



carinata, 206. 



catskillensis, 210. 



fergusoni, 208. 



knoxensis, 206. 



limitaris, 208. 



mordax, 208. 



occidentalis, 208. 



perspectiva, 212. 



rarinotata, 206. 



solitaria, 204, 208, 209. 



striatella, 167, 205, 210, 

 214. 



eUADRULA, 7J. 

 uadrula coccinea, 66, 78, 79, 80, 393. 

 lachrymosa, 66, 83. 

 plicata, 66, 50,81,83, 96,393. 

 pustulosa, 48, 66, 86. 

 rubiginosa, 66, 77, 80. 

 trigona, 66, 76, 77, 78, 80. 

 tuberculata, 38, 393. 

 undulata, 48, 66, 81, 82, 83. 

 verrucosa, 66, 5j;393. 



Radix, 260. 



SEGMENTINA, 300. 



Segmentina armigera, 300, 301, 303. 



SlGMURETHRA, 140. 



Selenites, 171. 



SOMATOGYRUS, 339. 



Somatogyrus integer, 341, 342. 

 isogona, 339, 340. 

 subglobosus, 339, 340, 

 341. 



SPH^RIUM, ///, 112, 113, 125. 



