SOME NEW AMERICAN PYCNODONT FISHES. 



By James Williams Gidley, 



Assistant Curator of Fossil Mammals, United States National Museum. 



In the United States National Museum are several specimens rep- 

 resenting five apparently undescribed species of Pycnodont fishes. 

 One of these is referable to Microdon, a genus liitherto not known 

 from deposits of this continent. The others are apparently referable 

 to species of two other Old World forms Gododus and Anomceodus, 

 but the latter genera have already been reported from American 

 deposits. These specimens form the basis of the 

 following descriptions and brief note: 



MICRODON TEXANUS, new species. 



Type. — Vomerine plate containing nearly aU 

 the teeth. (Cat. No. 7621, U.S.N.M.) See fig. 

 1, p. 445. 



Paratype. — Portion of left splenial containing 

 teeth of three rows. (Cat. No. 7065, U.S.N.M.) 



Type-locality. — Hamilton County, Texas. The 

 paratype came from near Vanderpool, Bandera 

 County, Texas. Both the type and paratype 

 specimens come, apparently, from similar de- 

 posits, and are probably of Lower Cretaceous 

 age. 



Description. — Size, large, as compared with 

 M. elegans, the type-species; dental surface rela- 

 tively broad and decidedly convex laterally, 

 with teeth of the inner rows loosely spaced; 

 teeth of the various rows about the same rela- 

 tive proportions to each other as those of M. 

 discoides (Woodward), but differ from those of 

 the latter iu general form; teeth of median row 

 broadly elipsoid, about one and one-half times broader than long; 

 inner paired series irregularly triangular, with long axis obUquely 

 inclined and set well within the interspaces of the median row; teeth 

 of outer paired series much larger than those of inner paired rows. 



Fig. 1.— Miceodon texanus. 

 Type. Vomerine plate, 

 NAT. SIZE. 1. Palatine 

 VIEW. la. Section about 



MIDDLE POINT TAKEN FEOM 

 POSTERIOR VIEW. 



Proceedings U. S. National Museum, Vol. 46— No. 2036. 



445 



