30 University of Michigan 



J lead compressed, rather deep, obtuse, upper profile more 

 inclined than lower or with slight angle over front nostrils 

 and lower more inclined and evenly convex. Sides of head 

 flattened, not constricted below. Snout obtusely convex both 

 in profile and over surface, width but trifle greater than its 

 length. Eye small, rounded, high, about first 2/5 in length 

 of head. Mouth moderate, oblique, jaws nearly even or man- 

 dible but slightly protruding. Premaxillaries little protruded 

 down. Maxillary narrow, concealed along its upper portion, 

 reaches opposite hind nostril or not quite to front rim of eye. 

 Lips thin. ]\Iandible depressed, rather shallow, broad, and 

 rami but little elevated inside mouth. Jaw edges rather thin, 

 trenchant and tough. Tongue thick, fleshy and little free. 

 Nostrils together on upper side of snout, posterior larger and 

 exposed in crescent, and anterior with well developed cutane- 

 ous edge, placed about last third in snout length. Interorbital 

 evenly convex. Preorbital rather rounded, its width 7/8 its 

 length. Postorbital Avidth i 1/4 in eye, other suborbitals but 

 little narrower. Hind edge of preopercle nearly straight, in- 

 clined forward. 



Gill-opening extends forward to middle of head, isthmus 

 width I 4/5 in eye horizontally. Gill-rakers 2 + 9, slender 

 firm points, longest about 7 in longest gill filaments. Last 

 nearly equal eye. Pseudobranchic-e i 1/2 in eye. Teeth 2,4 

 - 4.2. hooked, each with well developed grinding-surfaces. 

 Scales very small, crowded over predorsal region of back, 

 also on breast. Preventral scales and postventral scales next 

 in size, those on caudal peduncle, postdorsal and postanal 

 regions rather broadly exposed. Scales on costal region very 

 narrowly imbricated, those on caudal base not much smaller 

 than others. Short pointed adnate scale in ventral axil. L. 1. 



