INDEX OF GENERA AND SPECIES. 



299 



Venus angustffrons, 118. 

 bisecta, 28, 99. 

 brevilineata , 95. 

 Californica, 94. 

 callosa, 96. 



Kennerlyi, 22, 55, 94, 95. 

 lamellifera, 95, 97. 

 lenticularis, 239. 

 maxima, 98. 

 Nuttallii, 95. 

 Pajaroensis, 118. 

 pertenuis, 22, 55, 95. 

 rhysomia, 96. 

 rigida, 97. 

 securis, 95. 

 succincta, 94. 

 tantilla, 96. 

 tetrahedra, 239. 

 varians, 239. 

 Yeatchii, 238. 



Vola,104. 



dentata, 104. 

 Volutilithes, 76, 220. 



Californica, 225. 



indurata, 76. 



Navarroensis, 220. 



YOLDIA, 31, 58, 103. 



Cooperii, 31, 59, 103. 

 impressa, 58, 103. 

 nasuta, 58, 103. 



ZIRPH.EA, 18, 52, 88. 



crispata, 88. 



dentata, 18, 124. 



Gabbii, 52, 88. 

 Zizyphinus, 17, 83, 170, 229. 



annulatus, 83. 



canaliculatus, 83. 



