ART. XXXIV.—A CONTRIBUTION TO THE KNOWLEDGE OF THE 
IGHTHYOLOGICAL FAUNA OF THE GREEN RIVER SHALES, 
By E. D. Cops. 
The railroad-cut through the bluff on the west side of Green River, 
Wyoming, at Green River City, has been known for some years for the 
numerous fishes preserved in the shales through which it is excavated. 
An investigation into the ichthyology of this horizon and locality was 
undertaken by the writer, and a report published in the Annual Report - 
of the United States Geological Survey of the Territories for 1870. 
Hight species of fishes were there described. Subsequently, in my ex- 
pedition of 1872, I discovered a second locality, sixty miles north of the 
“ Fish-cut”, near the mouth of Labarge Creek, from which several species 
of fishes and insects were obtained. A third locality, nearer the main 
line of the Wasatch Mountains, has been more recently found, and a 
very fine collection of fishes procured and forwarded to me by my 
friend, H. Schoomaker. The specimens are mostly in a fine state of. 
preservation, and are preserved on slabs of a calcareous shale, with leaves 
and insects. The mineral is of softer consistence than the slate otf 
Green River, and thus permits of a more complete exposure of the bony 
structure of the fishes. In the following pages, sixteen species from this 
locality are described, all of which are new to science. Many of them - 
~ are nearly allied to the species. already known from the cut at Green 
River, belonging to the same genera, but none of them are identical.. 
Three genera not previously represented in ute fauna are added. Gen- 
eral remarks follow the descriptions. 
DAPEDOGLOSSUS TESTIS, Cope, gen. et sp. nov. 
Char. gen.—Family Osteoglossidee. A single row of elongate acute 
teeth on the premaxillary, maxillary, and dentary bones;. vomer, tongue, 
and (?) basihyal bones closely studded with short comic grinding teeth. 
Mouth rather short. Pectoral fin with the anterior ray elongated; dor- 
sal fin not elongate, with the anal well separated from the caudal. No 
beards. 
This interesting genus presents the characters of the family to which 
I refer it in its segmented scales, posterior dorsal fin, etc., and does not 
differ widely in essentials from Osteoglossum. The principalsdifferences 
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