BULLETIN 



American Museum of Natural History. 



Volume XIX, i903. 



Article I. — ON CERTAIN GENERA AND SPECIES OF 



NORTH AMERICAN CRETACEOUS ACTINOP- 



TEROUS FISHES. 



By O. P. Hay. 



Plates I-V, and 72 Text Figures. 



The present paper has resulted from observations made by 

 the author on Cretaceous fishes in the course of his work of 

 identifying, cataloguing, and arranging the Cope Collection of 

 fishes and reptiles, now the property of the American Museum 

 of Natural History. In this collection are most of the types 

 of the fishes which Professor Cope described from the Creta- 

 ceous deposits of Kansas, South Dakota, and New Jersey; and 

 there are likewise many other specimens which had not been 

 carefully identified and studied. A comparison of these ma- 

 terials with the types, and of the types with one another, and 

 an estimation of the value of the proposed species in the light 

 of work done by more recent investigators, have resulted in 

 the reduction of a considerable number of nominal species to 

 the position of synonyms. Many of Cope's types have hitherto 

 never been figured and the opportunity offered by the liber- 

 ality of the Museum authorities has been employed to furnish 

 many drawings and photographic reproductions of interest- 

 ing specimens. My thanks are especially due to Prof. Henry 

 F. Osborn for the opportunity to prepare and present this 



[;/anitarj', igoj.] [i] 1 



