180 Trans. Acad. Sci. of St. Louis. 
INDEX TO GENERA. 
Acalypha 110 
Acantholeberis 164, 168-171, 174 
Acer 54 
Acris 76, 78-80 
Aglia 42-43. 
Agriolimax 76 
Allium 102, 108 
Alona 165-166, 168-171, 174 
Alonopsis 165, 168-171, 174 
Alopecurus 107 
Ambystoma 81 
Amelanchier 105, 109 
Anura 79 
Arabis 101, 109 
Arenaria 108 
Aristida 103, 107 
Asplenium 101, 107 
Baptisia 110 
Bifidaria 76 
Bosmina 162-164, 168-171, 174 
Brancippus 161 
Bufo 75-76, 79-81 
Bulimulus 75-76 
Buthus 75 
Camassia 108 
Camptocerus 165, 168-171, 174 
Camptosorus 107 
Canthocamptus: 159, 168, 170-172 
Carex 108 
Catalpa 54 
Celtis 108 
Cercis 110 
Ceriodaphnia 160, 168-171, 174 
Chaerophyllum 102, 111 
Cheilanthes 101, 107 
Chorophilus 78, 80 
Chydorus 166, 168-171, 174 
Claytonia 109 
Cnemidophorus 76 
Coreopsis 103-104, 112 
Crataegus 109 
Crotonopsis 102-103, 110 
Cuphea 111 
Cyclops 156-159, 168, 170-172 
Cynosciadium 102, 111. 
Cyperus 102, 106, 108 
Daphnella 160, 168-171, 174 
Daphnia 161-162, 168-171, 174 
Daucus 111 
Desmognathus 91 
Diaptomus 153-155, 168-172 
Diemyctilus 91 
Digitaria 107 
Diodia 112 
Diospyros 105 
Dodecatheon 111 
Draba 109 
Dryopteris 101, 107 
Eleocharis 102, 108 
Engystoma 74, 80 
Equisetum 107 
Eragrostis 103, 107 
Eumeces 76 
Euphorbia 110 
Eurycerus 164, 168-171, 174 
Eutaemia 75-76 
Festuca 108 
Fimbrystylis 102 
Fraxinus 54, 105, 111 
Gamasus 115 
Gleditschia 54 
Glyceria 108 
Helicina 76 
Heuchera 109 
Holbrookia 74-76 
Hyla 79 
Hypericum 102, 110 
Ilyocryptus 164, 168-171, 174 
Isanthus 103, 111 
Juglans 54 
Juncus 102, 108 
Juniperus 76 
Labidocarpus 120 
Lathyrus 102, 110 
Lechea 110 
