— 30 — 



Ocinebra circumtexta Stearns. 



"Occasional papers," May, 1871. Amer. Jour, of Conch., March, 



1872, vol. VII, p. 172, pi. 14, f. 14 (not 15). 0. lurida, var. d. Carp., 



Mss. No. 762 (J. G. Cooper), Geog. Catal., part. Keep, West Coast 



Shells, p. 24, f. 6. 



Living — Monterey to San Miguel I. 



Quat. — San Joaquin Bay, Orange County, and San Nicolas Island 

 (S. Bowers). 



Ocinebra poulsoni Carpenter. 



Jour, de Conchy 1., XII., 1865, p. 148. Moll, of West. Amer., p. 



151, 316. 



Living — Santa Barbara to San Diego. 

 Quat. — Ventura, Calif. (S. Bowers). 



Ostrea palmula Carpenter. 



0. conchaphila, var. palviula. Carp., Mazatlan Shells, p. 163, 1857; 

 "A distinct species," in Appendix, p. 550. Also, in Proc. Zool. Soc. 

 Lond., 1863, p. 364. Moll, of West. Amer., pp. 199, (646), (132). 



Living — San Diego to Panama. 



PI. — Ventura County (S. Bowers). Identified by Dall. This is one 



of the marine plicated forms like 0. vespertina Conrad, and several 



others of my former Catalogue, that will probably be united as one 



species. 



Ostrea subfalcata? Conrad. 



Foss. of Med. Tertiary Formation, p. 50, pi. XXV, f. 2. Heilprin, 



in Foss. Ost. of N. Amer. Geol. Kept., 1884, p. 313, pi. 68, f. 1, 2, 3. 



C. R. Orcutt, " The Colorado Desert," in 10th Annual Pveport of the 

 State Mineralogist, 1890, pp. 839-916. 



Carrizo Creek, San Diego County (C. R. Orcutt). The "expert" of 

 the U. S. Geol. Survey, who named the specimens sent from Carrizo 

 Creek by Orcutt, may have easily mistaken those of 0. vespertina Con. 

 for the above-named fossil, before known only from Virginia, though 

 there are some strong differences in the types as described by Conrad, 

 who also remarks on their resemblances. It might be supposed that if 

 0. virginica can have existed on this coast, any other Eastern species 

 could also. This is quite possible, and some of those described by 

 Carpenter as now living on the west Mexican coast may prove to be 

 the connecting links. The species called 0. veatchii by Mr. Orcutt is 

 probably 0. heermanni Con., the former not having been before recog- 

 nized at Carrizo Creek. Still they may be identical species. 



