236 PALAEONTOLOGY OF CALIFORNIA. 



HOMOMYA, Agas. H. CONCENTRICA, Gabb. 



Panopcea concentrica, Gabb; Vol. 1, p. 148, pi. 22, fig. 119. 



Homomya concentrica, Gabb ; Vol. 2, p. 179. 



Chico Group, Tuscan Springs, Cotton wood Creek, and Martinez. 



NEJERA, Gray. N. DOLABRJEFORMIS, Gabb. 



Necera dolabrceformis, Gabb ; Vol. 1, p. 153, pi. 22, fig. 125. 

 Tejon Group, Martinez. 



MACTRA, Linn. ? M. TENUISSIMA, Gabb. . * 



? Mactra tenuissima, Gabb; Vol.^p. 179, pi. 29, fig. 68. 

 Martinez Group, Martinez. 



\ 



M, GIBBSANA, Meek. 



Mactra Gibbsana, Meek; Proc. Phil. Acad., 1861, p. 315. 

 Cret.?, Island in Gulf of Georgia. 



CYMBOPHORA, Gabb. C. ASHBURNERII, Gabb. 



Mactra Ashburnerii, Gabb; Vol. 1, p. 153, pi. 22, fig. 127. 



Cymbophora Ashburnerii, Gabb ; Vol. 2, p. 181, pi. 29, fig. 69. 



Cbico Group, Pence's, Chico Creek, Texas Flat, Martinez, Tuscan Springs, 

 Orestimba, Benicia, ahd San Luis Gonzaga ; Martinez Group, Martinez 

 and Benicia; Tejon Group, Martinez, Marsh's, Clayton, Griswold's, and 

 Tejon. 



LTTTRARIA, Lam. L. TRUNCATA, Gabb. 



Lutraria truncata, Gabb; Vol. 1, p. 154, pi. 22, fig. 128. 

 Chico Group, Pence's and Chico Creek. 



ASAPHIS, Modeer. A. UNDULATA, Gabb. 



Asaphis undulata, Gabb ; Vol. 1, p. 154, pi. 22, fig. 129. 

 Chico Group, Texas Flat. 



A. MULTICOSTATA, Gabb. 



Asaphis multicostata, Gabb; Vol. 2, p. 181, pi. 29, fig. 70. 

 Chico Group, Crooked River of Des Chutes, Eastern Oregon. 



