COPE ON CRETACEOUS AND TERTIARY FISHES. 73 



Measurements. 



M. 



Total lengtli (head imperfect) 0.040 



Length to opercular border 0.010 



Length to first dorsal ray (axial) 0, 013 



Length to first ventral 0. 016 



Length to first anal 0, 023 



Length to base of caudal fin 0. 032 



Length of base of dorsal fin , 0. 005 



Length of base of anal fin 0. 002 



Depth at first dorsal ray 0. Oil 



Depth at first anal ray 0. 009 



Depth at base of caudal fin 0. 0065 



From the Niobrara Cretaceous of Dakota; from Br. F. Y. Say den. 



Teichophanes poliarum, sp. nov. 



The Tertiary shales of Florissant in the South Park of Colorado have 

 already yielded numerous species of plants, insects, and fishes, which 

 have been described by Messrs. Lesquereux, Scudder, and myself.* 

 Six species of fishes have been determined, three of which pertain to 

 a genus of Catostomidce, which I had originally procured from the paper 

 coal of Osino, Nevada. On this ground, an approximation of the hori- 

 zons of the two localities was made. I now record the occurrence of a 

 species of the second genus found in the Osino coal, TricJiophanes, of 

 which the T. Mans has been up to the present time the only one known. 

 The epochal identification of the two formations is thus confirmed. 



The TricJiopJianes foUarum is represented by a larger individual than 

 the T. Jiians, but which wants the posterior part of the body, including 

 the caudal and part of the anal fin. The generic and family characters 

 are, however, very clearly visible in the anterior portion of the skeleton. 



The premaxillary bone forms all or nearly all of the superior arcade 

 of the mouth. There are a few rows of small equal teeth en brosse on the 

 dentary bone. Four rather wide branchiostegal rays are visible in the 

 8pecimen. The posterior superior angle of the operculum (which is dis- 

 placed in the specimen) is drawn out into an acute short spine. There 

 is a row of small teeth en hrosse probably on the palatine or pterygoid 

 bone. The anterior vertebrae are unmodified, and the centra are not elon- 

 gate. A strong acute spine supports the dorsal fin, and a similar one the 

 anal fin in front. There is an elongate postclavicle on each side, which 

 extends parallel with the femur to the base of the. ventral fin. The 

 femur is divided ; the external portion is straight, and extends to the 

 clavicle, while the other portion is curved inward and forward, reaching 

 the apex of the corresponding bone of the opposite side. Ventral radii, 

 8. The dorsal fin originates above the ventral fin. The scales are 

 peculiar, and characteristic of the genus. They are very thin, and with- 

 out or with, minute sculpture. Their borders are fringed with long, 

 closely-set, bristle-like processes, which correspond to the teeth of the 

 ctenoid scale. 



* Bulletin U. S. Geol. Surv Terrs. 1875, n. 1, 3. 



