Occasional Papers of the Museum of Zoology 7 



over its anterior half. The width of the type specimen is 62% 

 of the depth; in other specimens 55-65%. The head is short 

 and is contained 4.4 [(3.9) 4.2 — 4.4 (4.8)]* times in the total 

 length. It is of moderate depth, bluntly triangular in side view ; 

 its dorsal contour, not including the premaxillaries, straight or 

 faintly convex. The snout is likewise short, truncated in side 

 view on account of the nearly vertical direction of the premaxil- 

 laries, and is contained 3.8 [(3.5) 3.6 — 4.0 (4.4)] times in the 

 head. The premaxillaries are always heavily pigmented, and 

 usually make an angle of 60^ — 70° with the horizontal axis of 

 the head, so that their tip is usually at or below the lower edge 

 of the pupil. The maxillary is always more or less pigmented, 

 the cutting edge usually rimmed with black halfway to its distal 

 end; it is short, being contained 2.7 [(2.5) 2.6 — 2.8 (3.0)] 

 times in the head. The eye is large, is contained 3.8 [(3.6) 3.9 

 — 4.2 (4.4)] times in the head and is situated in the second 

 quarter of the head-length, encroaching more or less on the 

 third. The lower jaw is always shorter than the upper and is 

 usually heavily tipped with black. The lateral line scales num- 

 ber y2 [(67) 72 — 81 (96)]. The gill-rakers on the first 

 branchial arch number 14-I-23 [(11) 12 — 14 (16) -j- (20) 21 

 — 24 (27) = (31) 34 — 38 (43)]. The paired fins are rela- 

 tively short. The pectoral length divided into the interval be- 

 tween the pectoral and ventral insertions equals 2.1 [(1.8) 2.0 — 

 2.5 (2.8)] ; the ventral length into the distance from its origin 

 to the anal equals 1.4 [(1.2) 1.4 — 1.7 (1.8)]. 



The color of living paratypes has not been recorded but it is 

 probably not different from that of the race of rcighardi oc- 

 curring in the northern basin of Lake ]\Iichigan. As in other 



^These and succeeding figures given in brackets are based on an ex- 

 amination of 145 paratypes ranging in length from 200-257 mm. ; the 

 usual as well as the extreme range in variation is given, the latter in 

 parentheses. 



