CRETACEOUS FOSSILS. 247 



I. Whitneyi, Gabb. 



■ Jnoceramus Whitneyi, Gabb; Vol. 2, p. 193, pi. 31, fig. 91. 

 Chico Group, Polsom. 



I. subundatus, Meek. 



Inoceramus subundatus, Meek; Proc. Phil. Acad., 1861, p. 315. 

 Chico Group, Vancouver Island. 



AUCELLA, Keys. A. Piochii, Gabb. 



Inoceramus Piochii, Gabb; Vol. 1, p. 187, pi. 25, fig. 173 (exclus. fig. 174). 



Aucella Piochii, Gabb ; Vol. 2, p. 194, pi. 31, fig. 92, a-c. 



Shasta Group, Mitchell Canon, north side of Mount Diablo; Knoxville, Puta 

 Creek, and elsewhere in Lake County; near the Simmons' Springs, and 

 elsewhere, Colusa County, and at numerous other spots along the eastern 

 face of the northern Coast Range ; also southwest of San Jose, below the 

 Almaden mines ; and from Washington Territory. 



PINNA, Linn. P. Brewerii, Gabb. 



Pinna Brewerii, Gabb ; Vol. 1, p. 188, pi. 25, fig. 175 a. 

 Id., Gabb; Vol. 2, p. 195, pi. 32, fig. 93. 



Chico Group, Curry's, south of Mount Diablo, Martinez, Cottonwood Creek, 

 Shasta County, and Cottonwood Creek, Siskiyou County. 



TRIGONIA, Brug. T. Tryoniana, Gabb. 



Trigonia Tryoniana, Gabb ; Vol. 1, p. 188, pi. 25, fig. 176. 

 Chico Group, Tuscan Springs. 



T. EvANSANA,Meek. 



Trigonia Evansana, Meek; Trans. Albany Inst., Vol. 4, p. 42. 



T. Evansii, Gabb; Vol. 1, p. 189, pi. 25, fig. 177. 



One of the most characteristic fossils on the "West Coast, peculiar to the Chico 

 Group, and found in California, at Pacheco's Pass, south of Mount Diablo, 

 Orestimba, Martinez, Benicia, Tuscan Springs, Chico Creek, Pence's, Cot- 

 tonwood Creek, Shasta County, Cottonwood Creek, Siskiyou County, Texas 

 Plat, and Rag Canon ; in Oregon, at Jacksonville, on the Siskiyou Moun- 

 tains, and on the Crooked River of the Des Chutes ; and finally, on Van- 

 couver Island, at Nanaimo, whence it was described by Mr. Meek. 



