240 



INDEX OF GENERA AND SPECIES. 



? Inoceramus rectangulus, 47. 



Leda, 199. 



Leda protexta, 199. 



translucida, 199. 

 Lima, Jur., 43; Cret., 202. 

 Lima apj)ressa, 203. 

 ? cuneata, 44. 

 microtis, 202. 

 recticostata, 44. 

 ? sinuata, 43. 

 Limopsis, 200. 



Limopsis transversa, 200. 

 Lithophagus, 185. 



Lithophagus oviformis, 185. 



LlTHOSTROTION, 5. 



Lithostrotion Californiense,6. 

 mamillare, 5. 

 Littorina, 131. 



Littorina compacta, 131. 

 Loripes, 177. 



Loripes dubia, 177. 

 Lucina, 175. 



Lucina cretacea, 177. 

 cumulata, 176. 

 nasuta, 175. 

 postradiata, 175. 

 subeircularis, 176. 

 Lunatia, 105. 



Lunatia avellana, 105. 

 ? Conradiana, 107. 

 Hornii, 106. 

 nuciformis, 107. 

 Shumardiana, 106. 

 Lutraria, 154. 



Lutraria truncata, 154. 

 Lysis, 138. 



Lysis duplicosta, 138. 



Mactra, 153. 



Mactra Asburnerii 153. 



Margaritella, 118. 



Margaritella crenulata, 118. 

 globosa, 119. 

 Martesia, 145. 



Martesia elausa, 145. 

 Meekia, 191. 



Meekia navis, 192. 

 radiata, 192. 

 sella, 191. 

 Megistostoma, 144. 



Megistostoma striata, 144. 

 Meretrix, 163. 



Meretrix arata, 166. 



Californica, 166. 

 Hornii, 164. 

 lens, 164. 

 longa, 165. 

 nitida, 165. 

 ovalis, 166. 

 Uvasana, 163. 

 Mitra, 103. 



Mitra cretacea, 103. 

 Modiola, 184. 



Modiola cylindrica, 185. 

 ornata, 184. 



Siskiyouensis, 184. 

 Monotis, 31. 



Monotis subeircularis, 31. 

 Morio, 104. 



Morio tuberculatus, 104. 

 Myacites, Trias., 28 ; Jur., 51. 

 Myacites depressus, 51. 



Humboldtensis, 28. 

 Myophoria, 33. 



Myophoria alta, 33. 

 Mysia, 178. 



Mysia polita, 178. 

 Mytilus, Trias., 29; Jur., 49; Cret., 

 183. 

 Mytilus ascia, 183. 



Homfrayi, 29. 

 humerus, 184. 

 multistriatus, 49. 

 pauperculus, 183. 



