NO. 2177. FOSSIL FISHES IN NATIONAL MUSEUM— EASTMAN. 283 



LEPIDOTUS WALCOTTI, new species. 

 Plate 12, fig. 4; plate 13, fig. 3. 



An imperfectly definable robust species of moderate size, attaining 

 a total length of about 30 cm., and exhibiting similar proportions as 

 in L. minor and L. notopterus; apparently closely related to the Upper 

 Triassic L. gallineld. Scales smooth, thick, deeply overlapping, not 

 serrated; clavicle extremely massive; head parts and paired fins 

 not observed; dorsal with about 15 stout rays. (Cat. No. 8119, 

 U.S.N.M.) 



It is to be regretted that no complete individuals of this early 

 representative of the genus have yet been discovered. The examples 

 figured in the accompanying plates are the most perfect which are 

 contained in the collection made by Doctor Walcott during his first 

 work in connection with the United States Geological Survey. Al- 

 though the collections were made more than 35 years ago by Doctor 

 Walcott, in whose honor I have pleasure in dedicating the species, 

 it does not appear that any other person has obtained fish remains 

 from the Utah Trias, nor has any other species of Lepidotus been 

 described from this country. 



Although fish remains were found by Doctor Walcott in considera- 

 ble abmidance hi the Kanab section, no other fossil vertebrates were 

 noticed by hmi. Besides Lepidotus, the only other genus that can 

 be certainly identified among the remains is Pholidopliorus, evidently 

 of primitive character. A single saurian tooth, perhaps crocodilian, 

 has also been recognized. This latter is significant in view of the 

 fact that a Triassic saurian fauna has been found on the Little Colo- 

 rado in Arizona, in the San Juan Valley, Utah, not far from the Colo- 

 rado River, at various points in southwestern Colorado where Doctor 

 Cross has been engaged in survey work for many years, and in the 

 vicinity of Lander, Wyoming, where Dr. S. W. Williston has made 

 collections. Li the opinion of Doctor Cross, as stated to the writer 

 in a personal commmiication, "the horizon exploited by Williston^ 

 in Wyoming is the same as that which furnished the vertebrates 

 described by Lucas ^ in Arizona. 



The section made by Doctor Walcott in the Kanab Valley, Utah, 

 was first published by Doctor Cross, as already remarked, in 1908. 

 That part of it lying above the Permian is here introduced in order to 

 show the relations of the beds which carry a vertebrate famia. 



SECTION IN KANAB VALLEY, UTAH, MADE BY C. D. WALCOTT, 1879. 



Jurassic. 



Feet. 



1. White Cliff sandstone, massive, cross-bedded, light gi'ay, broken into five 



principal belts by horizontal lines of bedding 585 



1 williston, S. W. Notice of some new reptiles from the Upper Trias of Wyoming. Journ. Geol., vol. 

 12, 1904, pp. 68S-697. 



> Lucas, F. A. Vertebrates from the Trias of Arizona. Science, vol. 14, 1901, p. 376. A new batrachian 

 and a new reptile from the Trias of Arizona. Proc. U. S. Nat. Miis., vol. 27, 1904, pp. 193-195. 



