INDEX. 



Sphserium fabale, 113, 118, 119. 

 lilycashense, jpj, 396. 

 occidental, 113, 119, 124. 

 simile, 113, 116. 

 solidulum, //j>, 115, 117. 

 stamineum, 113, //./, 116, 



117, 118,395. 

 striatinum, 112, 113, 114, 



117. 



vermontanum, jp/, 395. 

 Spirogyra, 298, 299. 

 Statistics, 33. 

 STENOTREMA, 140, 163. 

 STREPTODONTA, jjg. 

 STREPTONEURA, ?/o. 

 Strobila, 225. 

 Strobila morsei, 225. 

 strebeli, 225. 

 STROBILOPS, 225, 228. 

 Strobilops labyrinthica, 225, 226. 

 STROPHITUS, 66. 

 Strophitus edentulus, 65, 67, 6S, 73. 



pavonius, 65, 68, 69. 

 STYLOMMATOPHORA, JJQ. 

 SUCCINEA, 217, 218. 

 Succinea alba, 223. 



avara, 223, 224. 

 calumetensis, 220. 

 compacta, 223. 

 decampi, 220. 

 forsheyi, 220. 

 magister, 223. 

 major, 223. 

 obltgua, 218, 220. 

 oval is, 217, 218, 219, 220, 224 

 Pellucida, 260. 

 peoriensis, 220. 

 retusa, 220, 222, 224, 260. 

 totteniana, 218, 220. 

 vermeta, 223. 

 wardiana, 223. 

 ivihoni, 220. 



SUCCINID/E, 2l6. 



SYMPHYNOTA, 392. 

 Symphynota complanata, 392, . 



compressa, 58, 392. 



costata, 392. 



TjENIOGLOSSA.J/?. 



Tebennophorus, 200. 

 TELEODESMACEA, ///. 

 Tellina pusilla, 127. 

 TESTACELLA, i6g, 170. 

 Testacella haliotoidea, 269, 170. 

 TESTACELLID.E, i6g. 

 Topography, 12. 

 TRIODOPSIS, 140, 14.3. 

 Triodopsis lunula, 144. 



UNIO, 48, 49, 65, 69 

 Unio aesopus, 48. 



affinis, 103. 



approximus, 103. 



Jnio arctior, 70. 

 asperatus, 86. 

 asperrimus, 83. 

 bullatus, 86. 

 canadensis, 94. 

 cardium, 94. 

 carinatus, 108. 

 chunii, 76. 

 cormttus, 89. 

 costatus, 82. 

 crassus, 108. 

 delicatus, j>pj. 

 dilatatus, 70. 

 distans, 103. 

 dolosus, 99. 

 dorfeuillianus, 86. 

 ellipticus, 108. 

 fasciatus, 108. 

 flaws, 77. 

 floridensis. 100. 

 fragilis, 99. 

 gibbosus, 66, 70, 83. 

 gouldianus, 79. 

 gouldii, 79. 

 hildrethianus, 65, 77. 

 hippopeeus, 80. 

 inflates, 103. 

 latecostatus, 82. 

 leprosus, 101. 

 lunulatus, 83. 

 luteolus, 30, 33, 36. 

 mortoni, 86. 

 novieboraci, 105. 

 occidens, 94. 

 pernodosus, 86. 

 pilsbryi, 82, 83. 

 prcelongus, 101. 

 prasinus, 86. 

 quadrates, 83. 

 rariplicata, 80. 

 riddellii, 76. 

 ^a^rz, 101. 

 jtf tor, 94. 



schoolcraftensis, 86. 

 schoolcraftii, 86, 88. 

 siliquoideus, 103. 

 subovatus, 94. 

 /^r^, 100. 

 truncates, 92. 

 upsoni, 108. 

 zigzag, 91. 



Utricularia vulgaris, 299. 



VALLONIA, ^5. 

 Vallonia americana, 252. 



amurensis, 251. 



costata, 251, 252, 253. 



enniensis, 249. 



helvetica, 251. 



hispanica, 249. 



montana, 251. 



parvula, ^5^. 



