26 University of Michigan 



est at ventral origin. Caudal peduncle compressed, least depth 

 about half its length. Head compressed, flattened sides con- 

 verging below, and lower profile little more inclined. Snout 

 convex, length about 4/5 its width. Eye rounded, high, about 

 first 2/5 in head. Mouth inclined, lower jaw slightly includ- 

 ed. Maxillary rather slender, well inclined, reaches eye. Low- 

 er jaw rather shallow. Tongue fleshy, adnate. Nostrils to- 

 gether, posterior larger. Interorbital broadly convex. Pre- 

 orbital about equals eye. Hind preopercle edge vertical. Gill- 

 opening last 2/5 in head. Rakers (damaged) pointed, moder- 

 ate, firm. Filaments and pseudobranchise moderate. Teeth 

 1,4-4.1, hooked, with entire grinding-sur faces. Scales mostlj' 

 narrowly imbricated, strije radiating, series parallel with 1. 1., 

 little smaller on breast. L. 1. continuous, decurved, little low 

 along side of caudal peduncle at first. Tubes simple, well over 

 scale exposures. Dorsal origin little nearer caudal base than 

 snout tip. Anal origin slightly after dorsal base. Caudal 

 (damaged) evidently emarginate. Pectoral long, slender, 2/3 

 to ventral. Latter inserted little before dorsal, reaches vent, 

 which close to anal. 



Color in alcohol faded mostly uniform dark brownish. 

 Sides of trunk leaden. Head sides silvery tinted. Iris dull 

 leaden. Fins pale brownish, upper hind part of dorsal with 

 slightly dusky tint. 



Length 57 mm. (caudal damaged). 



No. 22,901, A. N. S. P., cotype of Photogcnis spiloptcrus 

 Cope. St. Joseph River in southwestern Michigan. E. D. Cope. 



Cope gives eye 3 1/2 in head. He also says "median part 

 of caudal fin, a spot on the upper hinder portions of the dor- 

 sal, and a narrow vertebral line black", all of which cannot be 

 satisfactorily determined in my example. Otherv.'ise his ac- 

 count agrees. 



