LYMNZIDZ OF NORTH AMERICA. 537 
meekii, 99, 101. 
megalosoma, 185. 
megasoma, 1, 2, 3, 5, 7, 20, 47, 183, 
~ 784-191, 410, 451. 
megastoma, 184. 
Melania multistriata, 111. 
Melanopsis, 89. 
merostoma, 166 
mexicanus, 353-355. 
michiganensis, 303, 321, 322, 324, 327, 
334, 362. 
micronema, 81, 92. 
mighelsi, 1, 32, 400, 402, 409, 412-415, 
416, 427, 432, 440, 447, 452, 453, 460. 
mighelsianus, 417. 
minor, 370, 373. 
minuscula, 95. 
minuta, 466. 
modicella, 6, 19, 20, 27, 52, 53, 63, 199, 
210, 245, 246, 258, 259-270, 279, 281. 
282, 283, 288, 294, 295. 
mOlleri, 370, 371. 
montana, 436, 437. 
multistriata, 111. 
Musculium truncatulum, 20. 
Mya arenaria, 28. 
nashotahensis, 208, 109. 
nasoni, 397, 398, 409. 
navicula, 165, 167. 
nebrascensis, 98. 
NEOPALUSTRIS, 358, 376, 377. 
Neritina, 28, 84. 
Neritostoma, 178. 
niagarensis, 391, 392, 394. 
nigrescens, 466. 
nitens, 370, 373. 
nitida, 375. 
nitidula, 89, 91. 
nuttalliana, 302-305, 313, 363, 364. 
obrugsay Ie 2,10; 9) 27, 39 39) 535) 6s: 
ae i, WO NZ, Wee. WWORI76 “Ales 
203, 233, 236, 240, 254, 263, 267, 270. 
271, 275-292, 296, 312, 319-321, 378, 
379, 392. 
occidentalis, z60, 161. 
Omphalia, 297, 
Omphalobulimus, 127. 
Omphiscola, 296-298, 461. 
ontariensis, 416, 432, 433. 

opacina, 382. 
oronensis, 403, 438-440. 
Otostomus dombeyanus, 463. 
ovata, 32, 41, 457, 463, 466. 
owascoensis, 250, 251, 254. 
Pachymelania, 84. 
pallida (authors), 274, 282. 
pallida (Adams), 162, 203, 282, 377, 
378, 379. 
palmeri, 463. 
Paludina, 41. 
palustris, 1-7, 15, 19, 21, 22, 27-29, 32, 
38, 41-43, 46, 52-54, 63, 94, 96, 101, 
127, 149, 170, 279, 281, 283, 298-309, 
311-330, 334-337, 340, 343, 344, 351, 
356, 357, 359, 361-379, 384-390, 404- 
407, 414, 432, 440, 442. 
patva, 2, 19.205 33; 39,52; '631-87,199! 
202, 204, 236, 239, 241, 242, 243-254, 
258, 262, 264, 267, 274, 281, 282, 370, 
373, 466. 
pellucida, 165, 167. 
peninsule, 283, 285. 
perampla, r5r. 
pereger, 15. 
peregra, 28, 32, 39, 40-46, 54, 400. 
Perla, 41. 
perpolita, 222-224. 
petersi, 454-456, 457. 
petitii, 466. 
petoskeyensis, 295, 296. 
philadelphica, 273-275, 282. 
Physa, 22, 25-27, 33, 44, 81, 84, 88, 
121, 458. 
Physa acuta, 28. 
se ancillariamasc: 
“«  elliptica, 462. 
fontinalis, 41. 
gyrina, 20. 
“heterostropha, 332, 462. 
primeana, 35. 
sayii, 24-27. 
Physastra, 124, 128. 
- vestita, 128. 
Physide, 124. 
pilsbryana, 430, 435, 436. 
pilsbryi, 254. 
pingelii, 54, 358, 374-376. 
pinguis, 382, 383, 389-391, 398, 448. 
Pisidium, 29, 372. 
