34 FISH-CULTURAL ‘ASSOCIATION. 
77. Premaxillary and tongue toothless; gill-rakers 46-52 . 
arted, 
vg. Eye large (} to 4 length of head); size small. 
k. Anal rays to; gill-rakers 55 . . Aoyz. 
kk. Anal rays 14; gill-rakers 45 . . merk¢ subsp. — 
1. Stenodus mackenzs¢zz Rich. Inconnu., 
Luciotrutta Mackenzii Gunther, Cat. Fish. Brit. Mus., vi., 1866, 
p. 164. Mackenzie’s River and its tributaries; Yukon 
river, Alaska. 
A food-fish of great value; the largest of the white-fishes. 
Growing to four feet in length, and reaching 50 pounds in 
weight. “It is full of spawn from September to Janu- 
ary, when it disappears.” —Dall. ‘ 
2. Coregonus labradoricus Rich. Lake Whiting. 
Great Lake Region; lakes of the Adirondacks, of mountains of 
New England and north-eastward, preferring clear, cold 
lakes. 
Itiis abundant in cold, clear Jakes; and’ in Labrador tie 
species frequently reaches the length of eighteen inches, but 
in New England the average size is somewhat belowthis. This 
species may be regarded as certainly nearly related to the com- 
mon white-fish, C. clupetformis, from which it differs chiefly in its 
somewhat more decided lingual dentition and its slenderer body. 
It seems besides never to reach so large a size as the typical 
great lake form. It would seem that the size of the species 
increases somewhat in the northern portion of its habitat. This 
species has been erroneously placed in a group characterized by 
numerous long and slender gill-rakers; asa matter of fact the 
gill-rakers are not more numerous in this species than in zz/- 
fiamsoni and kenicottit, The oldest name for this species is the 
one here employed, but the New England form has since been 
described by Prescott in the American Journal of Science and 
Arts, 1851, under the name of Coregonus cohantoniensis. 
3. Coregonus clupetformds (Mitch). Milner. Common white-fish. Great 
lakes. British America. 
This is the most important of all the white-fishes; it has 
been extensively reared by artificial methods and dis- 
tributed as widely as New Zealand. The Otsego lake form 
is said to be the most southerly in the United States, but 
wellZamsone?é OCCurs in rivers of Utah. 
