Fig. 



'49 



150 



'S' 



[52 



IS3 

 154 

 155 

 .56 



157 

 158 



'59 

 160 

 i6i 

 162 

 163 

 .64 



■65 

 166 

 167 

 168 

 169 

 [70 

 171 

 172 

 173 

 '74 

 '75 

 .76 

 177 

 [78 

 179 

 180 

 [81 

 182 



'83 

 184 



!5 

 186 



^7 

 iS 

 [89 

 190 

 191 

 192 



'93 

 194 



'95 

 .96 



'97 

 198 



'99 



200 



201 



202 

 203 

 204 

 205 



Author's original, from life 



l^alvata tricarinata 



Valvata bicarinata 



Vahata sincera . . . 



Ampullaria depressa . 



Ampullaria miamiensis 



Somatog'^rus altilus 



Somatogyrus subglobosa 



Amnicola limosa . . . 



Bichynia tentaculata , 



Goniobasis virginica 



Goniobasis multineata 



Anculosa carinatm . . 



Succinea obliqua . . 



Succi?iea retusa . . . 



Lymniea stagnalis . . 



Lymriisa palustris . 



Lymritea columella . . 



Lymnixa decidiosa 



Lymncea catascopiiim . 



Planorbis bicarinatus 



Planorbis campanulatm 



Planorbis trivohis 



Planorbis magnificus . 



Segmentina armigerus 



Segmentina wheatleyi 



Ancylus rivularis 



Ancylus parallelus . . 



Physa heterostropha 



Aplexa hypnorum . . 



Lymnaa auricularia . 



Viviparus malleatus .' 



Spharium simile. Enlarged . After Gould 



Spharium striatinum . 



Pisidium compressum . 



Pisidium abditum . . 



Unto complanatus 



Lampsilis radiatum 



Lampsilis ochraceus 



Lampsilis cariosus . , 



Anadonta cataracta 



Anadonta implicata 



Margaritana margaritifera 



Margaritana marginata . . 



Tubiculous Worms, Timnodrilis claparadii 



Author's original, from life 

 Freshwater Polyps, Hydra viridis and H. fusca 



Author's original, from life 

 Freshwater Polyp, Cordylophora lacustra . . 



After Hess 

 Outline of a Water Beetle . . 



Water-boatman, Corisa interupta. 

 Back-swimmer, Notonecta undulata . . 

 Water-scorpion, Napa apiculata . . . 

 Water-scorpion, Ranatra fusca . . 

 Giant Water-bug, Belostoma griseum . . 

 Giant Water-bug, Zaitha fluminea . . 

 Giant Water -bug " " 

 Creeping Water-bug, Ambrysus signoretti 

 Toad-bug, Belogonus americanus 

 Shore-bug, Salda signoretti 



Author's original, from life 



374 



