296 FOSSIL OSTEEID^ OF NORTH AMERICA. 



Ostreu exogyrella Gabb. 



Mr. Gabb published this forai without figures in the Proceedings of 

 the Academy of Natural Sciences of Philadelphia for 187G, page 322. 

 He reported it from -the Cretaceous strata of Georgia, but so far as I 

 am aware it has not since been recognized. 



Ostrea faleata Morton. 



(See Ostrea larva Lamarck, on a following page, with which Morton's 

 form is regarded as identical.) 



Ostrea franMini Coquand. 



(Plate XXXIX, Figs. 1, 2, 3.) 



Dr. D. D. Owen figured but did not describe this form on Plates VII 

 and VIII of the Second Eeport of the Geological Survey of Arkansas, 

 and referred it to the Ostrea cretacea of Morton. (See remarks under 

 the head of 0. cretacea on a preceding page.) 



" Ostrea gabbanna Meek & Hayden." 



This name appears in Meek's Check List of North American Creta- 

 ceous Fossils, but it is believed that no description or illustration of it 

 has ever been published. 



Ostrea inornata Meek. 



A description and figure of this small form are given by Mr. Meek 

 in Vol. IX of the United States Geological Survey of the Territories, 

 page 14, Plate X, Fig. 4. The latter is an unsatisfactory representation 

 of a species, and the description fails to convey a clear idea of it. 



Ostrea idriaensis Gabb. 



(Plate XXXIV, Figs. 7, 8.) 



Mr. Gabb described both this form and 0. appressa from the Tejon 

 Group of California. Under the head of the latter name on a previous 

 page I have suggested that both forms probably belong to one and the 

 same species. 0. idriaensis is figured by Mr. Gabb on Plates 33 and 34 

 of Vol. II, Paleontology of California, and it is described on page 203 of 

 the same volume. 



Ostrea (Alectryonia) larva Lamarck. 



(Plate XLII, Figs. 2, 3, 4, 5, 6, 7, 8, 9.) 



This variable species has probably a wider geographical distribution 

 than any other Cretaceous Ostrea; and it has been known under more 

 than a dozen sjiecific names. It is known in various parts of Europe, in 

 Southern India, and in different parts of the United States, esi)ecially 

 in New Jersey and Alabama. 



Morton in his synopsis proposed for three American varieties of this 

 shell the three specific names falcata, nasuta, and mesenterica. 



