314 FOSSIL OSTREID^ OF NORTH AMERICA. 



capacious. All traces of radiate plications, if it ever possessed any such 

 ornanientatiou, have disa|)peared in the specimens before me. The 

 long forms may be readiiy distinguished from the 0. cranslssima La 

 marck by the comparative shortness of the umbonal rcsiou. 



Osirea rcleriana Conrad. 



(Plate LXX, Fig. 1.) 

 This species was collected in Arizona by the Onited States and Mexi- 

 can Boundary Commission, and published in Vol. I, Part IT, page ICO. 

 It is stated to be probably Miocene. 



Ostrea virglnica Gmcliu ( = 0. virginiann Lamarck). 



Syn. — 0. mauricensis Gabli ; Journal of Iho PbiladelpLia Acaili my of Natural 

 Sciences, IV (n. s.), page 376. 



The 0. manricen-iis does not appear to ditfer materially, if it differs at 

 all, from the long fcrms of 0. virginicn. This species has been found 

 fo.ssil in New Jersey, Maryland, Virginia, North Carolina, and South 

 Carolina. 



A fossil form of the Faluns of Touraine, and in the vicinity of Bor- 

 deaux, is recognized as identical with the common living oyster of our 

 Atlantic coast — 0. virgimca {M6m. Soc. G6o\. do France, II). 



PLIOCENE. 



Ostrea aUcoodi Gabb. 



This species has already been noticed under the head of Miocene. 

 Gabb was undecided whether to refer it to Miocene or Pliocene age. 



Ostrea hourgeoisii Esmond. 



(Plate LXXI, Fig. 1.) 

 Published in the Proceedings of the California Academy of Sciences, 

 1863, page 13, and by Gabb in Paleontology of California, II, page 33. 

 It is referred to the Pliocene strata of California. 



Ostrea hecrmanni Conrad. 



This is also a reputed California species. It was published in the Pro- 

 ceedings of the Philadelphia Academy of Sciences for 1855, page 267; 

 and in the Pacific Eailroad Reports, V, page 320. 



Tliis species was originally described as probably Miocene (as prob- 

 ably from the same deposit which contained 0. vespertina), and is given 

 as such in Meck's Miocene List; but in the appended "Notes and Ex- 

 planations" (page 20) it is stated that "Conrad now thinks his Osirea 

 hecrmanni probably a Cretaceous si^ecies." Carrizo Creek, Colorado 

 Desert, where it was found, is Pliocene, according to Gabb ; and the 

 0. hecrmanni is accordingly given as a Pliocene species in Paleontology 

 of California, II, p. 107. 



