248 PALEONTOLOGY OF CALIFORNIA. 



T. Gibboniana, Lea. 



Trigonia Gibboniana, Lea ; Trans. Am. Phil. Soc, 1840, p. 255, pi. 9, fig. 7. 



T. Hondaana, Lea ; loc. cit., p. 256, pi. 9, fig. 9. 



T. Hondaana, d'Orb. ; Prod. Pal. Strat , Vol. 2, p. 106, No. 771. 



T. Gibboniana, Gabb ; Vol. 1, p. 190, pi. 17, fig. 178; pi. 31, fig. 262. 



Chico Group, Martinez, Jacksonville, and Crooked Creek of the Des Chutes. 



T. .equicostata, Gabb. 



Trigonia cequicostata, Gabb; Vol. 2, p. 196. 

 bidet, Vol. 1, p. 209, pi. 26, fig. 198. 



Chico Group, Orestimba, south of Mount Diablo, Martinez, Cottonwood 

 Creek, Shasta County, and Jacksonville, Oregon. 



MEEKIA, Gabb. M. sella, Gabb. 



Meekia sella, Gabb; Vol. 1, p. 191, pi. 25, fig. 179. 



Martinez Group, Martinez ; Chico Group, Tuscan Springs, and Siskiyou 

 Mountains. 



M. radiata, Gabb. 



Meekia radiata, Gabb; Vol 1, p. 192, pi. 25, fig. 179 a. 



Chico Group, Pacheco's Pass, Orestimba, Tuscan Springs, Siskiyou Mountains, 

 and Jacksonville, Oregon. 



M. navis, Gabb. 



Meekia navis, Gabb; Vol. 1, p. 192, pi. 25, fig. 180. 

 Chico Group, Martinez, Chico Creek, and Pence's. 



ARGA, Lam. A. Breweriana, Gabb. 



Area Breweriana, Gabb ; Vol. 1, p. 193, pi. 25, fig. 181. 

 Chico Group, Cottonwood Creek, Tuscan Springs. 



A. gravida, Gabb. 



Area gravida, Gabb; Vol. 1, p. 194, pi. 30, fig. 264. 



Chico Group, Pacheco's Pass, and Rag Canon, Napa County. 



A. decurtata, Gabb. 



Area decurtata, Gabb ; Vol. 1, p. 195, pi. 31, fig. 265 a. 

 Chico Group, Rag Canon. 



