THIRTEENTH ANNUAL MEETING. 37 
« 
C. guadrilateralis is apparently the most widely distributed of 
all the white-fishes and naturally is subject to much variation. In 
the Yukon river region the form of the head is somewhat dif- 
ferent from that of the ordinary eastern type, and, strangely 
enough, this variation of the head is repeated in some of the 
Maine lakes. The appearance of this species on the Island of 
Kodiak which is separated from the mainland of Alaska by a 
wide and deep ocean channel is one of the most interesting of 
recent discoveries in the ichthyology of Alaska. C. guadrilateralis 
is a small and slender species, seldom exceeding fifteen inches 
in length, but its quality is excellent. It is noteworthy that this 
species has a smaller number of gill-rakers than any other spe- 
cies of the North American white-fishes. Prescott, in the jour- 
nal already referred to, redescribed this white fish under the 
name Coregonus nove-anglia. 
6. Coregonus welliamsoniz, Girard. Rocky Mountain white-fish ; Chief 
Mountain white-fish. 
Coregonus couestz. Milner. Rept. U.S. Comm. Fish. for 1872— 
1873 (1874), p. 88. 
Clear streams and lakes fromthe Rocky Mountains to the Pacific, 
northward to Oregon; found also in tributaries of the Sas- 
katchewan and of the upper Missouri. Recently received 
from Mill Creek, Oregon, whence it was sent by Col. I. R. 
Moores. This isan abundant and valuable food-fish. 
The size of Coregonus williamsonit is small, about equal to that 
of C. guadrilateralis, which it closely resembles; it has, usually, a 
larger maxilla and less elongate body, and the number of gill- 
rakers is somewhat larger. The Chief Mountain white-fish (C. 
couestt, Milner) is now known to be identical with Coregonus wit- 
liamsonit. 
7. Coregonus kennicotté?. Milner. Broad white-fish. 
Known in Alaska from the Kuskoquim basin to Meade river in 
the extreme northern part of the territory. 
This is the Muksun of the Russians, a name transferred from 
a Siberian species of similar appearance. The broad white-fish 
reaches the weight of thirty pouuds, ranking next in size to the 
Inconnu only. It has a short head, remarkably small, subequal 
jaws, and its body is very thick. It is a food-fish of great excel- 
