PLATE XXXI. 



PAGE 



Fig. 202. Trigonia G-ibboniana. Natural size. 190 



Fig. 265. Aeca dectjrtata. Natural size. 195 

 265 a. Id. Opposite side, exhibiting the truncation. 



Fig. 266. Cucull^a Mathewsonii. Natural size. 195 



Fig. 267. Axin^ea (? Limopsis) sagittata. Natural size. 197 

 207 a. Id. Surface. 



Fig. 268. A. cor. Magnified. 198 

 268 a. Id. Surface. 



Fig. 270. Pecten Californicus. Magnified. 201 



Fig. 271. Lima appressa. Natural size. 203 



Fig. 272. Ostrea malleiformis. Natural size. 204 



Fig. 273. Exogyra parasitica. Natural size, lower valve. 205 



273 a. Id. Upper valve. 



Fig. 274. ? Astroccenia petrosa. Natural size. 208 



274 a. Id. Surface magnified. 



Fig. 275. Indet. 209 



