12 
BULLETIN OF THE BUREAU OF FISHERIES. 
longer than eye, and 3.5 times in the distance from the depressed dorsal to its base. The gillrakers are 
16 to 18 + 31 or 32. The eye, as in huronius, is smaller than in the original sisco from Lake Tippecanoe. 
It is astonishing how long the slight characteristics of the Lake Michigan and Lake Huron herring 
{huronius) persist in these separated waifs of the glacial lakes, once part of this lake system. 
Leucichthys sisco huronius (Jordan & Evermann). Lake Huron Herring. (PI. 11.) 
Argyrosomus huronius Jordan & Evermann, Proc. U. S. Nat. Mus., xxxvi, p. 167, fig. 2, March 3, 1909, Port 
Stanley, Ontario. 
This is the common bluebaek or Michigan herring of Lake Huron and Lake Michigan. It occa- 
sionally enters Lake Erie, where it is recognized as the Lake Huron herring. We found no specimens 
in Lake Superior, but have recently received 4 from Wiarton, on Georgian Bay, through the kindness 
of the Doyle Fish Company, of Toronto. The original type of huronius figured by Jordan & Evermann 
was obtained at Port Stanley, on the north shore of Lake Erie, where about a dozen of this species were 
found mixed with about a thousand of Leucichthys eriensis. We have also specimens obtained at Erie, 
Pa., by Dr. Seth E. Meek, and numerous young examples from Lake Michigan. We are not able to 
see that these differ from Lake Huron specimens. Numerous specimens were taken at Port Huron 
and Mackinac. These vary considerably in the number of scales (80 to 90), but the form and general 
coloration of lustrous blue is seen in all examples. In all, the adipose fin is large, and the space 
between pectoral and ventral more than twice length of pectoral. The caudal peduncle is almost as 
Fig. 6. — Leucichthys sisco huronius (Jordan & Evermann). Lake Huron Herring. From the type. 
slender as in harengus. We may note that but a single specimen of artedi as accurately determined 
has been seen by us from Lake Huron. 
The Lake Huron herring may be described as follows' Head 4.66 in length to base of caudal; depth 
4.25; length of caudal peduncle from anal to first caudal rays 2 in head; depth of caudal peduncle 2.9; 
eye 5; snout 4; interorbital space 3.33; length of maxillary from tip of snout 3; dorsal 10 or 11; anal 
11 or 12; scales in lateral line 75 to 85; between lateral line and origin of dorsal 8; between occiput and 
dorsal 36; gillrakers 14 to 16+29 1:0 3 1 - 
Body notably elongate, elliptical, with slender, pointed head and slender tail, less compressed than 
in the other species of the genus; head small, the snout long and pointed, distance from tip of snout 
to posterior edge of orbit equaling 0.5 length of head; 0 lower jaw not closing within the upper, but 
extending slightly beyond it; maxillary reaching a pcint below center of pupil, its width contained 3 
times in the length; teeth on tongue only, minute, seen only by drying; gillrakers on first arch very 
slender, those near angle equal in length to diameter of eye, lateral line almost straight; scales large 
and rather loosely attached; dorsal inserted midway between anterior border of eye and base of 
caudal; height of first ray contained about 1.6 times in length of head; adipose fin large, longer 
than eye; length of base about equal to its height; origin of ventrals below middle of dorsal, the rays 
slightly shorter than those of dorsal; length of first anal ray 2.5 in head; caudal deeply forked; pectoral 
short, about 1.5 in head. 
a Our drawing is not accurate as to this character. 
