3-NOTES ON FISHES FROM THE BASIN OF THE MACKENZIE RIVER IN 
BRITISH AMERICA. 
By CHARLES H. GILBERT, 
Professor of Zoology in Leland Stanford Junior University. 
The following notes are based npon a small collection of fishes from the Mackenzie 
Eiver, British America, recently presented by Miss Elizabeth Taylor to the Museum 
of the Leland Stanford Junior University. 
Coregonus kennicotti Miluer. 
The single specimen is a skin in good condition, from the Delta of the Mackenzie 
Eiver (No. 808, L. S. Jr. Univ. Museum). Length 62 cm. This species is in many 
respects midway between Prosopium and Coregonus. The gill-rakers are short and 
few in number, but are .slender. The iireorbital is very long and narrow, its width 
less than diameter of pni)il. The maxillary is comparatively long and the supple- 
mental bone broad and ovate. Thus the gill-rakers are about as in quadrilateralis 
and other species of the section Prosopium, while all the other characters given ally 
the sjiecies with clupeifortnis and the rest of tlie Coregonus group. 
The head is very blunt, the iiremaxillaries wide and vertically placed. The mouth 
is inferior, with the high blunt snout but little projecting. The maxillary reaches 
slightly beyond the vertical from front of eye; its length, measured from its anterior 
articulation, equals length of snout, and is contained 4| times in the head (=4 in head 
when measured from tip of snout). Maxillary broadly ovate, apparently slenderer 
than in C. richardsoni as figured by Giinther, and with different outlines. Preoi'bital 
narrow, its greatest width contained 5 times in its length and 3^- times in diameter of 
eye. Eye moderate, shorter than snout, 54 in head, 14 in interorbital S]iace. Width 
of supraorbital bone two-fifths its length. Gill rakers short and slender, tapering to a 
slender flexible point; the longest is three-fourths diameter of pupil; six are developed 
on vertical limb, and fourteen on horizontal limb, of outer arch. Hyoid bone with 
a round patch of weak bristle-like teeth. These are very similar to those found in 
Stenodus, and are disposed in longitudinal series. The vertical height of head at nape 
is less than length of head by one-half diameter of eye. Head small, 5| in length to 
base of caudal; depth about 4|. Distance from tip of snout to nape one-third dis- 
tance from nape to front of dorsal. 
Front of dorsal nearer snout than base of median caudal rays by length of snout 
and eye. Adipose fin large, a wade strip at base covered with small regularly imbri- 
cated scales. It is inserted over last rays of anal, extending but slightly behind last 
23 
