INDEX 



Ablabesmyia, 95, 97, loi, 103, 107, 



109, 133, 184, 198. 

 Abramis chrysoleucas, 220, 221. 

 Acarina, 97, loi, 103, 107, 109, 129, 



205. 

 Acella, 148, 182, 223. 

 Acella haldcmani, 107, 127, 154, 



157, 178. 

 Acroperus harpae, 92, 94, 97, loi, 



103, 107, 184, 190, 191. 

 Adams, 194, 220. 

 Agraylea miiltipunctata, 92, 94, 97, 



loi, 103, 107, 109, 116, 138, 143, 



184, 196. 

 Alasmidonta, l6l. 

 Alasmidonta truncata, 140. 

 Alasmidonta undulata, 161. 

 Algae, 81, 92, 94, 97, loi, 109, III, 



137, 138. 

 Algae, blanket, 81. 

 Algae, blue-green, 63. 

 Algae, filamentous, 41, 55, 56, 59, 



63, 70, 1Z, 82, 83, 95, 96, 103, 105, 



121, 147, 151, 152, 157, 170-175. 

 178, 181-183, 189-193, 199, 200, 

 201, 206, 223. 



Alona quadrangularis, 92, 94, 97, 



184, 190. 

 Ambloplites rupestris, 220, 221. 

 Ambloxis, 167. 

 Ameiurus natalis, 220. 

 Ameiurus nebulosus, 220, 221. 

 Amiatus calvns, 211. 

 Amnicola, 94-96, 100, 102-109, 120, 



122, 124, 137, 138, 141, 146, 148, 

 155, 158, 176. 



Amnicola bakeriana, 16, 78, 94, 97, 

 99, loi, 103, 107, 133, 138, 143, 

 147, 154, 169, 244, 245._ 



Amnicola bakeriana nimia, 78, 92, 

 94, 97, 99, loi, 103, 107, 109, 130, 

 133, 137, 138, 147, 154- 169, 245. 



Amnicola clarkei, 97, loi, 109, 170, 

 245- 



Amnicola cmarginata, 107, 109, 



153-155. 171. 182. 

 Amnicola limosa, 155, 168, 169, 



244. 

 Amnicola limosa porata, 97, 109, 



168. 

 Amnicola lustrica, 138, 154, I55. 



170, 214, 246. 

 Amnicola oneida, 92, 94, 95, 97, 



99, loi, 103, 105, 107, 109, 133. 



138, 143, 146, 150, 159, 170, 246. 

 Amnicola schrockingeri, 245. 

 Amnicola walkeriana, 245. 

 Amnicolidae, 205. 

 Amphipoda, 82, 92, 94, 95, 97, loi, 



103, 105, 107, 109, 116, 123, 127, 



129, 133, 138, 205. 

 Anabasna, 81. 

 Ancylidae, 205. 

 Ancylus, 132. 

 Ancylus tuscus, 103, 174. 

 Ancylus parallelus, 94, 97, loi, 103, 



107, 109, 123, 125, 127, 131, 153, 



154, 174- 

 Ancylus species, 174. 

 Ancylus tardus, 174. 

 Animal life, greatest development 



of, 222. 

 Animals, characteristic bottom, 



146. 

 Animals, deep water, 109, 144, 145. 

 Animals, decrease in number with 



depth, 153, 184. 

 Animals, small size of, 202. 

 Anodonta, 161. 

 Anodonta cataracta, TJ, 109, 113, 



117, 161. 

 Anodonta grandis, 140, 161. 

 Anodonta grandis footiana, ^^, 



109, 113, 114, 117, 154, 161. 

 Anodonta implicata, 113, 153, 154, 



161. 

 Anodonta marginata, 161. 

 Aphanotheca saxicola, 83, 97, 



* Reference to pages 92, 94, 96, 97, loi, 103, 107, 109, 138, 152, and 184, 

 are to be unnumbered inserted tables facing these pages. 



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