674 



ZOOLOGY FISHES. 



the total five and three-fourths times. The scales are materially larger on 

 the caudal peduncle than on the post-scapular region, and the dorsal fin 

 originates considerably nearer the end of the muzzle than the basis of the 

 caudal fin. Radial formula: D. I. 11 ; C. 18, openly emarginate; A. I. 7 ; 



15 



V. 9, not reaching vent ; pectoral reaching half way to ventral. Scales, j. 



12 



The orbits are excavated at their superciliary border, and their diameter 

 enters their frontal interspace 1.66 times, and the length of the head 4.6 

 times, twice in the length of the muzzle in front of its border. The muzzle 

 considerably overhangs the mouth. The lip folds are tubercular and largely 

 developed, forming a discoidal funnel. The posterior is deeply incised be- 

 hind ; and there is a notch where it joins the anterior lip. The commissure 

 is transverse and abruptly an gulate to the canthus, and covered - with a 

 cartilaginous sheath as in Cliondrostoma. Isthmus very wide. 



Total length, O m .168; length to basis of caudal, CT.149 ; length to basis 

 of ventral, O m .082 ; length to basis of dorsal, O m .070 ; length of head, (T.029 ; 

 width of muzzle at mouth, O m .015; width of head at pterotics, O m .0156. Color 

 blackish ; belly and ventral fins yellowish (I pink). This species resembles 

 the Catostomus discobolus, Cope, but has larger scales, besides presenting 

 generic differences. Several specimens from near Provo. Collected by 

 Dr. H. C. Yarrow and H. W. Henshaw. 



PANTOSTEUS JAREOVII, Cope. 

 PLATE XXIX, FIGS. 2, la. 



Minomus jarrovii, COPE, Proc. Am. Phil. Soc. Phila., 1874, 135. Id., Eep. Plagop. & 

 Ichtby. Utah, 1874, 9. 



A less elongate species than the last, with a much less enlarged muzzle. 

 The anterior scales are smaller than the posterior, and the first dorsal ray is 

 nearly intermediate between the end of the muzzle and the basis of the 

 caudal fin. Radii: D. 9; C. 18; A. I. 7; V. 9, well removed from both 

 vent and pectoral fin. Depth at dorsal fin 5.75 times in total length, into 



