PLATE XXVIII. 



Fig. 



199, 



a 



Pig. 



200. 





Fig. 



200, 



a. 



Fig. 



201. 





Fig. 



202. 





Fig. 



203. 





Fig. 



204. 





Fig. 



205. 





Fig. 



205, 



a. 



Fig. 



206. 





Fig. 



206, 



a. 



Fig. 



207. 





Fig. 



208. 





Fig. 



209. 





Fig. 



209, 



a. 



Fig. 



210. 





Fig. 



210, 



a. 



Fig. 



211. 





Fig. 



212. 





Fig. 



213. 





Fig. 



213, 



a. 



Fig. 



214. 





Fig. 



215. 





Fig. 



216. 





Fig. 



218. 





Section of Volution of Ammonites Newberryanus. 

 Helicoceras declive. Natural size. 



(I (i a u 



Turrilites. Sp. inclet. Natural size. 



Fusus arattjs. Magnified. 



Cordiera microptygma. Magnified. 



Fusus Kingii. Natural size. 



F. Californious. Natural size. 

 Id. Magnified view of the surface. 



F. (Hemifusus) Hornii. Natural size. 

 Id. Magnified view of the surface. 



F. (H.) Cooperii. Natural size. 



Tritonium Hornii. Magnified. 



T. paucivaricatum. Magnified. 

 Id. Magnified view of body volution. 



T. Whitneyi. Natural size. 

 Id. Magnified view of body volution. 



Buccinum liratum. Natural size. 



Pseudoliva volut/eformis. Natural size. 



Fasciolaria sinuata. Natural size. 

 Id. Magnified view of body volution. 



F. Io. Natural size. 



Mitra cretacea. Magnified. 



Whitneya ficus. Slightly magnified. 



Lunatia nuciformis. Natural size. 



PAGE 



61 

 73 



73 



73 

 84 

 93 

 85 

 85 



86 



86 

 94 

 95 



96 



96 



99 



101 



101 

 103 

 104 

 107 





