36 University of Michigan 



Also Nos. 2,153 to 2,156, same data. Head 3 1/2 to 4 1/2; 

 depth 4 to 4 3/4; D. Ill, 7, I ; A. usually in, 7, i, seldom in, 

 6, I ; scales in lateral line to caudal base often 62 or 65, seldom 

 54. 56, 58, 63 or 64, and usually 3 more on caudal base, rarely 

 4; usually II or 12 scales above 1. 1., seldom 10; 7, 8 or 9 scales 

 below 1. 1. ; usually 34 predorsal scales, vary 28, 30, 32, 33, 35 

 or 36; snout 3 1/5 to 3 1/2 in head ; eye 3 7/8 to 4 1/3 ; maxil- 

 lary 2 3/4 to 3 1/3; interorbital 2 4/5 to 3 1/4; teeth usually 

 2,4-4,2, rarely 1,4-4,1 or 1,4-4,2; length 54 to 140 ? mm. 



Platygohio gracilis (Richardson) 



Hypsilcpis cornutus (part) Cope, Proc. Acad. Nat. Sci. Phila., 1864, 

 p. 279. Bruce, Macomb County (not of Mitchill). 



Head about 3 3/4 ? (caudal peduncle damaged) ; deptb 

 4 3/4 ? ; scales 40 -|- ? i'l lateral line ; 6 scales above 1. 1., 5 

 below ; 22 predorsal scales ; head width i 4/5 in its length ; 

 snout 3 ; eye 6 1/2 ; maxillary 2 4/5 ; interorbital 2 1/4. 



Body elongate, compressed, back slightly elevated, and 

 caudal peduncle rather long. Head broad as deep, sides not 

 converging below. Snout broad, depressed, length about 2/3 

 its width. Eye small, lateral, hind edge slightly before mid- 

 dle in head length. Mouth large, nearly horizontal, lower jaw 

 included within upper and snout tip slightly protrudes. Max- 

 illary barbel terminal, nearly as long as diameter of pupil. 

 Lips rather firm. Tongue broad, thick, adnate. Mandible 

 shallow, rami little elevated inside mouth. Nostrils large, to- 

 gether, close before eye, hind one crescentic. Preorbital 

 elongate crescent, long as i 1/2 eye diameters. Other subor- 

 bitals all narrow. Preopercle edge free. Interorbital broadly 

 convex, depressed medianly. Gill-rakers i -|- 5 short weak 

 points. Gill-filaments nearly long as eye, pseudobranchi^e lit- 

 tle smaller. Scales rather large, cycloid, all well exposed, 



