298 FOSSIL OSTEEID^ OF NORTH AMERICA. 



Ostrea multilirata Conrad. 



(Plate XXXVIII, Figs. 1, 2.) 



No very perfect examples of this species have been obtained, but it 

 is apparently a well-marked one. Conrad's types were collected near 

 the boundary between Mexico and Texas, and published in the report 

 of the United States and Mexican Boundary Survey, Vol. I, page 157, 

 Plate Xir, Fig. 1, a, b, c, d. 



Ostrea nasuta Morton. 



This form is regarded as only a variety of Ostrea larva Lamarck. (See 

 remarks under the latter head on a preceding page.) 



Ostrea owenana Shumard. 



Dr. Shumard published this form without illustration in the Proceed- 

 ings of the Boston Society of Natural History, Vol. VIII, page 200. It 

 was obtained by him from the Cretaceous strata of Texas. Not being 

 illustrated it seems impracticable to identify it from the description 

 alone. 



Ostrea panda Morton. 



Dr. Morton described this form as coming from Cretaceous strata ; 

 but Professor Heilprin regards it as of Tertiary age. (See his remarks 

 under the same head on a following page.) 



Ostrea pandceformis Gabb. 



This species was described by Mr. Gabb in the Proceedings of the 

 Academy of Natural Sciences of Philadelphia for 1861, page 328. It is 

 reported to come from the Cretaceous of Mississippi, but not having 

 been illustrated it seems impracticable to identify it. 



Ostrea patina Meek & Hay den. 



(Plate XLVII, Figs. 4, 5, 6.) 



This is a very common yet variable species in the Cretaceous strata 

 of the Upper Missouri Eiver region. Mr. Meek referred it with some 

 doubt to the genus Qryphcea. It is described and figured in Vol. IX of 

 the United States Geological Survey of the Territories, page 16, Plates 

 X and XI. 



Ostrea peouliaris Conrad. 



Conrad described this species in the Journal of the Academy of Nat- 

 ural Sciences of Philadelphia, Vol. Ill (n. s.), p. 329. On Plate 34 of 

 that volume he gave a single figure of a small shell, but it is too indefi- 

 nite to be of use in the identification of the species. It is reported to 

 come from the Cretaceous rocks of Mississippi. 



