642 GEOLOGICAL SURVEY OF THE TERRITORIES, 



is uot seen in any genns. The bristle-like bodies are scattered over 

 the whole extent of the fish, excepting the head and the fins, and are 

 arranged in little aggregations, which are irregularly disposed. The 

 processes themselves lie irregularly together, as though free from each 

 other, and arc evidently not the impressions of keels of the scales. 

 Traces of other scales are not visible, and the bodies described would 

 suggest the existence of an ossified ctenoid fringe on a less fully calsi- 

 tied scale, or jjossibly without such basis. 



Tbichophanes hians. Cope. 



Loe. cit., 480. 



Vertebrae, D., 9 ; C, 15 ; six between iuterneural spine of dorsal and 

 interhoeinal of anal fin. Radii, D. II, (?) 0, (soft rays somewhat injured ;) 

 A. II, 7; V. and P. not all preserved ; caudal rays numerous, forming a 

 deeply bifurcate fin. The ventrals reach a little over half way to the 

 anal, and the latter about half way from its basis to that of the caudal 

 fin. The dorsal fin, laid backward, reaches the line of the base of the 

 first anal ray. The first dorsal ray is a little nearer the end of the muz- 

 zle than the origin of the caudal fin. Tiie muzzle is very obtuse, and, if 

 the specimen be not distorted, not longer than the diameter of the orbit. 

 The gape extends at least to tlie posterior line of the orbit. The subor- 

 bital region is deep posteriorly. In its present somewhat distorted con- 

 dition, the specimen measures in — 



M. 



Total length : 0. 059 



Head 016 



Vertebra 029 



Gaiulalliu 0142 



Len <>th dorsal spiue 008 



Length anal spine '. 008 



Leugtii hair-like bodies 0005 



From the paper-coal of Osiuo, Nevada. 



AMYZON. Cope, Gen. Nov. Catostomidarum. 

 Proceed. Amer. Philos. Soc, 1872, p. 480. 



Allied to Bubaliohthys. Dorsal fin elongate, with a few fulcral spines 

 in front, and the anterior jointed rays osseous for a considerable part of 

 the length ; a few short osseous rays at front of anal fin; scales cycloid; 

 caudal fin emargiuate; mouth rather large, terminal. 



The characters of this genus appear to be those of the Catostomidw. 

 There are three broad branchiostegals. The vertebrge are short, and 

 the haima spines of the caudal fin are distinct and rather narrow. In 

 one specimen a pharyngeal bone is completely preserved. Not having 

 it before me at the moment, I merely observe that it is slender, and 

 with elongate inferior limb. The teeth are arranged comb-like, are 

 truncate, and number about thirty to forty. This and other portions of 

 the structure will be' more fully described when the whole series of spe- 

 cimens is investigated. The bones bordering the mouth above are a 

 little displaced, and the lower jaw proj(^cts beyond them-, and is directed 

 obliquely upward. The dentary bone is slender and toothless, and the 

 angular is distinct. The premaxillary appears to extend beneath the 

 whole length of the maxillary. Shoukl this feature be substantiated, it 

 will indicate a resemblance to Cyprinidte. The maxillary has a high 

 expansion of its superior margin, and then contracts toward its extrem- 



