238 



Corneocyclas abjssorum 14^ 



jequilateralis 141 



arctica 144 



borealis 144 



compressa 142 



glacialis 144 



henslowana 14s 



idahoensis 141 



nivalis 144 



occidentalis 143 



pulchella 144 



randolphi 144 



rotundata 143 



scutellata 141 



sibirica 144 



steenbuchii 14J 



ultramontana 144 



variabilis 142 



ventricosa 143 



virginica J41 

 Cornu (Si) 

 Corjne 183 



brachiata 177, 183, 210 



eximia (184) 

 Costatella (100), loi 

 Costella (100) 

 Cotulina polyzonias (201) 



tricuspidata (201) 

 Cumingia (loS) 

 Cyclas appendiculata (145) 



aurea (135) 



bulbosa 136 



calyculata 140 



dentata (137) 



dubia (141) 



elegans (136) 



emarginata (138) 



fabalis (137) 



flava (13S) 



fuscata 136 



jayensis (139) 



lenticula 140 



media (140) 



nobilis (137) 



ovalis (137) 



partumeia (139) 



patella (138) 



pulchella (144) 



rhomboida (136) 



Cyclas saratogea (135) 



similis {134) 



solidula (136) 



stagnicola (140) 



staminea (136) 



steenbuchii (143) 



striatina (135) 



sulcata (134) 



tenuis 139 



transversa (139) 



truncata (140) 

 Cyclocalyx 143 

 Cyclolimnsa 64 

 Cyclostoma lapidaria (119) 



tricarinata (121) 

 Cymatocjclas compressa 142 



Dall, W. H., land and fresh water 



mollusks 1-171 

 Dentati 97 

 Dentatus (97) 

 Diastropha (99) 

 contorta 100 

 Diplodiscus (82), 85, 86 

 Discoidina (83 ) 

 Discus (97) 

 Drepanotrema 82, 86 



EndodontidiE 49 

 Enydra (99) 

 Epiphragmophora 21 



fidelis 21 

 Erinna (61), 62, 65 



newcombi 61, 65 

 Euconulus J9, 40, 45 



fabricii 41, 42 



f ulva 42 



fulvus 39, (40), (41) 



trochiformis 40, 41, 42 

 Eucopella campanularia (188) 

 Eudendrium annulatum i86 



bacciferum (184) 



pvgmteum 1S6 



vaginatum 177, 182, 185, 212 

 Euhadra iiscina II 

 Eulimneus (61) 

 Eulota fiscina 11 



iJexibilis 11 



weyrichi 11 



