LYMNEIDZ OF NORTH AMERICA. 539 
subcarinata, 466. 
subula, 149. 
subulata (Sowb.), 93. 
subulata (West.), 149, 153. 
subulata (Dunker), 353-355. 
succinea, 150. 
Succinea, 462, 467. 
ot grosvenori, 247. 
. pellucida, 165, 167. 
= putris, 41. 
s ovalis, 170. 
Y retusa, 166. 
A wilsoni, 165, 167. 
succiniforimis, 165, 167. 
sufflatus, 302, 304, 305, 313. 
sumassi (authors), 303, 314, 359, 435, 
440. 
sumassi, (Baird), 53, 403-407. 
Tanousia, 127. 
tazewelliana, 243, 244, 248. 
techella. 1, 2, 4, 84. 100, 207-209, 211, 
213, 214-223, 231, 241, 396. 
terebrina, 467. 
terre-novee, 465. 
tenuicosta, 91, 92, 93, 103. 
tenuicostata, 91, 93, 198. 
tenuis, 464. 
Thaumastus, 94, 95. 
~ californicus, 94. 
Tortacella, 81, 84. 
i haldemani, 110. 
traskii (Lea), 365, 367. 
traskii (Tryon), 53, 203, 295, 346, 
367, 368, 369, 456. 
Triton teeniatus, 42. 
truncatula, 39, 41, 54, 101, 127, 196, 
199, 201-204, 208, 234, 235, 243, 247, 
255, 256, 274, 466. 
tryoniana, 303, 365, 367. 
tryonii, 365, 366, 367, 372. 
Tubifex rivulorum, 37. 
turricula, 314, 467. 
turritus, 353, 354. 

Typha, 21, 170; 339, 352. 
‘Se elatitolia, 21. 
umbilicata (authors), 205, 227, 234. 
umbilicata (Adams), 2, 22, 208, 236- 
242, 244, 245, 247, 258. 
umbrosa, 300, 323, 324, 327, 331, 332, 
347, 361, 362. 
Unio, 81, 84. 
ss complanatus, 332. 
utahensis, 29, 53, 84, 103, 222, 223, 
458. 
vahlii, 54, 235, 303, 307, 346, 370, 371- 
376. 
Vallonia gracilicosta, 247. 
Valvata, 21. 
variegata, 149. 
velutina, 128. 
Velutinopsis, 128. 
ventricosa, 182, 467. 
Vesica, 134. 
vetusta, 95, 97, 101. 
virginica, 467. 
virginiana, 463. 
vitrea, 464. 
Vivipara, 41, 84, 467. 
< contectoides, 467. 
3 decisa, 322. 
vulgaris, 127, 149. 
walkeri, 341, 342, 355. 
WASATCHENSIS, 152, 153. 
WHITEAVESI, 93. 
wilsoni, 165, 167. 
wisconsinensis, 1, 21, 155, 156-160}. 
413, 416, 421, 425, 426, 427. 
woodruffi, 21, 28, 366, 397, 398-400. 
446. 
wormskioldi, 370, 371, 373. 
wormskjoldi, 370. 
Zagrabica, 127. 
brusiniana, 128. 
naticoides, 127. 
zebra, 344, 345, 347. 
zrmanje, 127. 
“ 
