OF NORTH AMERICA. 



537 



meekii, 99, 101. 



megalosoma, 185. 



megasoma, 1, 2, 3, 5, 7, 20, 47, 183, 



184-191, 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. 

 modicdla, 6, 19, 20, 27, 52, 53, 63, 199, 



210, 245, 246, 258, ^5P-270, 279, 281. 



282, 283, 288, 294, 295. 

 molleri, 370, 371. 

 montana, 436, 437. 

 multistriata, 111. 

 Musculium truncatulum, 20. 

 Mya arenaria, 28. 



nashotahensis, 108, 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. 



obrussa, 1, 2, 6, 9, 27, 33, 39, 53, 63, 

 77, 87, 107, 127, 162, 170-177, 199, 

 203, 233, 236, 240, 254, 263, 267, 270. 

 271, 275-292, 296, 312, 319-321, 378, 

 379, 392. 



occidentalis, 160, 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, ^-309, 



311-330, 334-337, 340, 343, 344, 351, 



356, 357, 359, 361-379, 384-390, 404- 



407, 414, 432, 440, 442. 

 parva, 2, 19, 20, 33, 39, 52, 63, 87, 199, 



202, 204, 236, 239, 241, 242, ^-254, 



258, 262, 264, 267, 274, 281, 282, 370, 



373, 466. 



pellucida, 165, 167. 

 peninsulae, 283, 285. 

 perampla, 157. 

 pereger, 15. 



peregra, 28, 32, 39, 40-46, 54, 400. 

 Perla, 41. 

 perpolita, 222-224. 

 petersi, 454-5<5, 457. 

 petitii, 466. 



petoskeyensis, 295, 296. 

 Philadelphia, 273-275, 282. 

 Physa, 22, 25-27, 33, 44, 81, 84, 88, 



121, 458. 

 Physa acuta, 28. 



ancillaria, 388. 



" elliptica, 462. 



" fontinalis, 41. 

 gyrina, 20. 



heterostropha, 332, 462. 

 primeana, 35. 



" sayii, 24-27. 

 Physastra, 124, 128. 



vestita, 128. 

 Physidae, 124. 

 pilsbryana, 430, 435, 436. 

 pilsbryi, 254. 

 pingelii, 54, 358, 374-376. 

 pinguis, 382, 383, 389-391, 398, 448. 

 Pisidium, 29, 372. 



