INDEX. 



PATULA, 204, 205, 217. 

 Patula albina, 208. 

 PELECYPODA, ^5. 

 PHILOMYCUS, 200. 

 Philomycus carolinensis, 201, 202. 

 PHILOMYCID^E, 200. 

 Phryganea, 352. 

 Physemoda cequalis, 127. 

 PHYSA, 256, 307, 308, 317, 318. 

 Physa alba, 308. 



altonensis, 315. 



ampullacea, 311, 315. 



aurea, 315. 



cylindrica, 311. 



elliptica,j>/5. 



elongata, 317. 



elongatina, 317. 



febigerii, 315. 



fontana, 308. 



gabbi, 314, 315. 



glabra, 317. 



gyrina.j//, 308-316. 



haivnii,'S\.\. 



heterostropha, 139,?o5, 309, 310, 

 314, 316. 



hildrethiana, 311. 



integra, 308, 310, 314, 315. 



minor, 315. 



nicklinii, 315. 



oleacea, 315. 



/rt/, 311. 



plicata, 311. 



sayii, 308, j/o, 311, 314, 316. 



striata, 311. 



troostiana, 315. 



turrita, 317. 



virginea, 315. 



warreniana, 310. 

 PHYSID/E, 307. 

 PISIDIUM, 113, 7*4 125. 

 Pisidium abruptum, 127. 



abditum, 7^5, 129, 130, 396, 



400, 401, 402, 406, 408. 

 arcuatum, 126. 

 boreale, 401. 

 deer, 128. 



compressum, 125, 126, 128, 

 397, 398, 401, 404, 406-408. 

 cruciatum, 398, 401, 408. 

 fallax, 400, 401, 407, 408. 



ande, 397. 

 ndwerki, 406, 407. 

 kirklandi. 707. 

 kurtzi, 126. 

 mainese. 401. 

 minus, 126. 

 notatum, 126. 

 obscurum, 126. 

 pauperculum, 407. 

 plenum, 126. 



politum, 126, 759, 397, 400. 

 punctatum, ./o?, 404, 408. 

 resartum, 126. 



Pisidium roperi, yoj. 



rubellum, 126. 

 rubrum, 126. 

 regulars, 126. 

 septentrionale, 400. 

 scutellatum, ^OP, 403. 

 splendidulum, /oo. 

 tenellum, 126. . 

 variabile, 130, ?p7, 398, 408. 

 ventricosum, 400. 

 vesiculare, 400. 

 virginicum, 125, 126, 127, 397, 



398, 402, 403, 408. 

 walkeri, 401, 403, 408. 

 zonatum, 126. 

 PLAGIOLA, 75, go. 

 Plagiola donaciformis, 66, 97, 92. 



elegans, 66, 92, 93. 

 PLANORBIS, 256, 257, 286, 305. 

 Planorbis angulata, 292, 294. 

 antrosits, 292. 

 aroostookensis, 292. 

 &?//*, 294. 

 bicarinatus, 287, 292, 293- 



296. 



billingsii, 297. 

 brogniartiana, |296. 

 campanulatus, 287, ^/, 295, 



296. 



circumstriatus, 297. 

 concavus, 297. 

 corneus, 286, 287. 

 corrugatus, 292. 

 deflectus, 287, 2Q<). 

 distortus, 288-290. 

 engonatus, 292. 

 exacutus,287, 296. 

 fallax, 288. 

 hyalina, 296. 

 laulus, 292. 

 /^5, 296. 

 lenticularts, 296. 

 /,?/?, 288. 



macrostomus, 288, 290. 

 major, 292. 

 megastoma, 288. 

 minor, 294. 

 obliquus, 299. 

 parallelus, 2\Z. 

 parvus, 287, ^97, 298, 299, 



300. 



planorbula, 288. 

 plexata, 288, 290. 

 regularis, 288. 

 striatus, 292. 

 trivolvis, 286, 55*, 291, 293, 



295, 296. 

 truncatus, 286, 290, 291, 295, 



296. 



vermicularis, 297. 

 PLANORBULA, 300. 

 Plethodon erythronotus, 33. 

 PLEUROCERA, 319, 325, 326. 



