302 FOSSIL OSTEEID^ OF NORTH AMERICA. 



Tertiary species, but he never properly published it. (See Professor 

 HeilpriD's remarks under the same head on a following page.) 



Ostrea uniformis Meek. 



(Plato XLVIII, Figs. 6, 7.) 



In the report of Macomb's Exploration, page 124, Plate I, Figs. 2, a, 

 b, c, Mr. Meek published a form from New Mexico, which appears to 

 be a well-marked species; but so far only the type specimen is known. 



Ostrea ■vellicata Conrad. 



This species is not satisfactorily known. Conrad described and figured 

 it in the Eeport of the United States and Mexican Boundary Survey, 

 Vol. I, page 156, Plate XI, Figs. 2, a, b. It does not perhaps differ 

 specifically from 0. cortex, by the same author, which is figured on the 

 same plate. 



Ostrea vomer Morton. 



(Plate XLVIII, Figs. 8, 9, 10.) 



Dr. Morton published this form in his Synopsis of the Cretaceous 

 Formation of the United States, page 54, Plate IX, Fig. 5, under the 

 above name. Mr. Gabb and others have regarded it as identical with 

 the Ostrea lateralis of Nilsson; but it appears to me to as well deserve a 

 separate name as many other American forms which resemble European 

 species. Conrad made it the type of his proposed genus Qryphaostrea. 

 I do not, however, regard the characters upon which that proposed genus 

 was based as even subgenerically distinct from those of true Ostrea. 

 Genus Gryph^a Lamarck. 



GrypJiwa mucronata Gabb. 



This name was proposed by Mr. Gabb in Paleontology of California, 

 Vol. II, page 274, for the variety of 0. pitolieri to which Conrad had pre- 

 viously given the name 0. navia, 



Gryphwa mutabilis Morton. 

 (See Gryphwa vesieularis Lamarck.) 



Grgplicea navia Conrad. 



As above stated, Gabb gave the name G. mucronata to this form. 

 Professor Eoemer figured it on Plate IX of Kreidebildungen von Texas 

 as G. pitcheri, and he was doubtless right, as G. pitcJieri is a very variable 

 species, and G. navia is regarded as only a variety. 



Qryphwa pitcJieri Morton. 



(Plate XLIX, Figs. 1,2,3,4,5,6.) 



This is perhaps one of the most widely distributed and most variable 

 species among the Ostreidae of North America. It was originally dis- 



