442 GEOLOGICAL SURVEY OF THE TERRITORIES. 



Semotilus corporalis, Mitchill. Cope, Trans. Ainer. Pliilos. Soc, 

 1866, 363, Platte Eiver; Eed Cloud Creek. 



CERATICHTHYS SQUAMILENTUS, (COPE ;) Sp. 110V. 



Most nearly related to section III, (Trans. Amer. Pliilos. Soc., 1866, p. 

 365,) and therefore to the C. prosthemius,* Cope, but differing- from the 

 latter in its very much smaller scales. General form stout ; length of 

 head entering that of body, exclusive of caudal fin, 3.8 times ; depth 

 entering the same, five times ; eye 4.6 times in length of head, § length of 

 muzzle, and .6 interorbital width. Parietal region convex ; profile nearly 

 plane ; muzzle not prominent. Mouth horizontal ; maxillary bone not 

 reaching orbit. Dorsal fin considerably nearer the base of the caudal fin 

 than the end of the muzzle, and originating a very little in advance of 

 the origin of the ventrals. Eadii, D. 1. 8 ; A. 1. 7 ; Y. 7, extending to 

 anal, pectorals not reaching ventrals. Isthmus rather wide. Teeth 

 4.2-1.4. Scales small, 17-66-14, covering both dorsal and thoracic 

 regions completely. This description is taken from a small, probably 

 young, specimen ; length, M. .058. The barbels are short and slender 

 and easily overlooked. 



Above olive, below silvery ; a lateral band of blackish dust from the 

 head to the base of the caudal fin, widening behind ; a black band round 

 muzzle ; sides and back black dusted. Fins unspotted. 



Fron Henry's Fork of the Green Eiver, Wyoming. Cam. Carrington 

 discoverer. Several specimens. 



Ehinichthys maxillosus, Cope ; Proc. Acad. Nat. Sci., Phil., 1864, 

 p. 278, Numerous specimens from Eed Cloud Creek and the Platte. In 

 life the upper lip, ventral and anal fins, and inferior aspect of caudal 

 peduncle, are vermillion. 



Siluridce. 



Noturus flatus, Eafinesque. — From the waters of the Platte ; iden- 

 tical with those from the Ohio. 



IX.— MATERIAL RESOURCES. 



EEPOET ON THE LNDF/STEIAL EESOUECES OF WESTEEN 

 KANSAS AND EASTEEN COLOEADO. 



By E. S. Elliott. 



An article by Professor J. G. Cooper on " The Forests and Trees of 

 Northern America, as connected with Climate and Agriculture," ap- 

 peared in the Agricultural Eeport of the Commissioner of Patents for 

 1S60. In Professor Cooper's division of the continent into "provinces" 

 the word " campestrian " is used to express the "most marked charac- 

 teristic of the prairie and great central plain regions of North America, 

 which consists in their comparative destitution of forests and nearly 

 uniform surface, gradually rising from the Gulf of Mexico to the base 

 of the Eocky Mountains, where they attain an elevation of 4,000 to 5,000 

 feet." The campestrian x>ro vince, whose eastern boundary is the west 



* Deceived by some specimens in the Liverpool Museum, Dr. Gunther lias described 

 this species in the Catal. British Museum as the Gobio jplunibeus of Agassiz. A consid- 

 eration of Professor Agassiz's description makes it apparent that a very different fish 

 "tvas the subject of it, probably, as Girard has observed, a species of Semotilus. 



