144 CALIFORNIA ACADEMY OF SCIENCES. [Proc. .^d Ser. 



EXPLANATION OF PLATE VH. 



Page. 

 Lytoceras iimotheaniun IMayor. 63 



Figs. 145-148. Young adult shells. 

 Schlcenbachia oregoncnsts, sp. nov. 122 



Fig. 149. Very young shell; diameter 5.6 mm. 



Fig. 150. Very young shell; diameter 1.65 mm. 

 After J. P. Smith. 

 ( For cross-section see Fig. 144, Plate VI.) 

 Pholadomya anadna, sp. nov. 73 



Fig. 151. Shell; natural size. 

 Baculiles fairbanksi, sp. nov. 92 



Fig. 152. Adult; natural size. 



Fig. 153. Cross-section of same. 

 Lytoceras argonautaruin, sp. nov. 85 



Figs. 154-155. Young shells; two-thirds natural size. 

 Mactra gabbiana, sp. nov. 74 



Fig. 156. Shell; natural size. 

 Rhynchonella densleonis, sp. nov. 72 



Figs. 157-158. Top and front views. 

 Pedunculus pacificus, sp. nov. 74 



Fig- 159- Shell; natural size. 

 Rhyfichonclla whifeana, sp. nov. 72 



Figs. 160-161. Top and front views; natural size. 



