CEETACEOUS. 



301 



Ostrea subovata Sliumard. 



Dr Sbumard briefly described this form in the report of Marcy's Ex- 

 ploratiou of the Eed River of Louisiaua, page 193. He gave one figure 

 of it on Plate 5 of that volume, but it is too indistinct to be of any serv- 

 ice in the identification of the species. I suspect, however, that Shu- 

 mard's form is identical with the one I have mentioned on a previous 

 page under the name of 0. diluviana Lin. 



Ostrea siihspatulata Forlaes. 



(Plate XXXVII, Figs. 1, 2.) 



The type specimens of this species were obtained by Sir Charles Lyell 

 in New Jersey, and published by Forbes, with two wood-cuts, in the 

 Quarterly Journal of the Geological Society of Londou, Vol. I, i>age 

 CI. It has since been somewhat unsatisfactorily identified in the Cre- 

 taceous rocks of the Gulf States, but it has not been anywhere recog- 

 nized as an abundant form. 



Ostrea teeticostata Gabb. 



(Plate L, Figs. 4, 5.) 



Mr. Gabb reported this form as coming from the Cretaceous strata 

 of Tennessee and New Jersey. It is published in the Journal of the 

 Academy of Natural Sciences of Philadelphia, Vol. IV (u. s.), page 

 403. Two small, unsatisfactory figures of it are given on Plate 68 of 

 that volume. 



Ostrea torosa Morton. 



Dr. Morton published a form under this name in his Synopsis of the 

 Cretaceous Formation of the United States, page 52, Plate X, Fig. 1. 

 It is evidently, as Gabb has pointed out, only a distorted example of 

 Exogyra costata Say. (See remarks under that head on a following page.) 



Ostrea translucida Meek & Hayden. 



See remarks on a previous page under the head of Ostrea pellucida. 

 If as is supposed, this form is identical with that which the same au- 

 thors described under the name of 0. pellucida, the latter name must give 

 place to 0. translucida, because it was preoccupied by Defrancein 1821. 



Ostrea tuomeyi Coquand. 



Professor Tuomey obtained this species from the Cretaceous strata of 

 Alabama. It has never been figured, but it was described by him under 

 the name of Ostrea crenulata in the Proceedings of the Academy of Nat- 

 ural Sciences of Philadelphia for 1854, page 171. This name having 

 been preoccupied by Lamarck in 1801, Professor Coquand, in his Mon- 

 ographic du Genre Ostrea, page 68, gave Professor Tuomey's species 

 the name of 0. tuomeyi. 



Conrad seems to have intended to give the name Ostrea tuomeyi to a 



