240 



INDEX OF GENERA AND SPECIES. 



? Inoceramus rectangulus, 47. 



Leda, 199. 



Leda protexta, 199. 



translucida, 199. 

 Lima, Jut., 43; Cret., 202. 

 Lima appressa, 203. 

 ? euneata, 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. 



Loi'ipes dubia, 177. 

 Lucina, 175. 



Lueina eretacea, 177. 

 cumulata, 176. 

 nasuta, 175. 

 postradiata, 175. 

 subeireularis, 176. 

 Lunatia, 105. 



Lunatia avellana, 105. 

 ? Conradiana, 107. 

 Hornii, 106. 

 miciformis, 107. 

 Shumardiana, 106. 

 Lutraria, 154. 



Lutraria truncata, 154. 

 Lysis, 138. 



Lysis duplicosta, 138. 



Mactra, 153. 



Mactra Asburnerii 153. 



Margaritella, 118. 



Margaritella erenulata, 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. 

 TJvasana, 163. 

 Mitra, 103. 



Mitra eretacea, 103. 

 Modiola, 184. 



Modiola cylindrica, 185. 

 ornata, 184. 

 Siskiyouensis, 184. 

 Monotis, 31. 



Monotis subeireularis, 31. 

 Morio, 104. 



Morio tubereulatus, 104. 

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

 Myacites depressus, 51. 



Humboldtensis, 28. 

 Myophoria, 33. 



Myopboria alta, 33. 

 Mysia, 178. 



Mysia polita, 178. 

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

 183. 

 Mytilus ascia, 183. 



Homfrayi, 29. 

 bumerus, 184. 

 multistriatus, 49. 

 pauperculus, 183. 



