INDEX OF GENERA AND SPECIES. 



233 



Cuma, 9, 75. 



biplicata, 9, 75. 

 Cumingia, 94. 



Californica, 94. 

 Cyclas, 100, 120. 



acutilineatiis, 100. 



Estrellana, 120. 



fibrosa, 120. 



permacra, 120. 

 Cylichna, 115, 232. 



costata, 232. 



Oregona, 115. 



petrosa, 110. 

 Cylindrites, 232. 



brevis, 232. 

 Cymbophora, 179, 236. 



Ashburnerii, 180, 236. 

 Cyphosoma, 276. 



Texanum, 276. 

 Cypr^a, 78, 163, 225. 



Bayerquei, 163, 225. 



Mathewsonii, 164, 225. 



spadicea, 78. 

 Cyprina, 99. 



bisecta, 99. 

 Cyprinella, 242. 



tenuis, 212. 

 Cyrena. 26, 98. 



Californica, 98. 

 Cytherea, 95, 96, 118.- 



callosa, 96. 



crassatelloides, 96. 



gigantea, 97. 



Oregona, 95. 



solidissima, 96. 



vespertine, 118. 

 Defrancia, 7. 



Delphinula, 264. 

 Dentalium, 86, 115, 230. 



Cooperii, 230. 



bexagonum, 86. 



Nanaimoensis, 230. 



pusillum, 230. 



sti'amineum, 230. 



substriatum, 115. 

 Diadema, 276. 



Texana, 276. 

 Diadora, 115. 



crucibuliformis, 115. 

 Diodus, 242. 



tenuis, 242. 

 Dione, 95, 118, 239, 241. 



angustifrons, 118. 



brevilineata, 95. 



Conradiana, 241. 



Oregona, 95. 



Uvasana, 239. 



varians, 239. 



vespertina, 118. 

 Diptychoceras, 143, 214. 



laevis, 144, 214. 

 Discohelix, 224. 



Leana, 224. 

 Doliopsis, 113. 



b'diratus, 113; 



petrosus, 113. 

 Dolium, 113. 



petrosum, 113. 

 Donax, 89, 96, 183, 238. 



latus, 183, 238. 



protexta, 89. 



stultorum, 96. 

 Dosinia, 24, 96, 97, 119, 240. 



alta, 25, 97, 240. 



