Species Head in length} Depth in length | Depth of caudal 
peduncle in head 
Tae tis. a A ms * tes 4.33 a 43-46 ; 3.0 
ee MER op ee ge n eee ; 4.66 : es : 2.9 
eS ition cis Brahh toet ae ininee ; : - : a 455 a : 3.74.2 2.66 
ee a ae ees ea > | 3 peacg 1 ee eee 
L. Sa : Set eee ee git 4.4 | 3.3-3.5 2-2 
Accordingly for each fish examined the necessary measurements were made 
for the calculation of the above proportions. In addition the girth and the 
weight were determined and scales removed for age estimation. From June 14 
to August 24, 1920, the ciscoes taken in twenty pound nets at the Crewe Bros. 
Fishery near Merlin were examined daily. In August and November the fish 
taken at Port Dover, Nanticoke, McKillop’s Fishery (near Port Maitland) 
and Dunnville were examined. The following species have been identified: 
(1) Leucichthys sisco huronius (J. & E.), Lake Huron cisco. 
This species was readily distinguished by the long spindle-shaped body. 
The average proportions for 60 individuals were as follows: head in length 4.6, 
depth in length 4.3, depth of caudal peduncle in head 2.95. These figures are 
practically identical with those given by Jordan and Evermann for Lake Huron. 
This species is taken rather abundantly in the pound nets at Merlin but very 
few specimens were seen east of Long Point. 
(2) L. ertensis (J. & E.). Jumbo cisco. 
This is the most abundant species taken in pound nets from Rondeau to 
Point Pelee. It also occurs in large numbers eastward to Long Point but appears 
to become very much less abundant beyond. It is noted for the large size 
attained as compared with the other species of the genus Leucichthys. The 
outstanding characters are (1) the deep body, (2) the more or less pronounced 
hump at the nape, (3) the deep caudal peduncle, (4) the relatively large scales. 
The average proportions for 150 individuals were: 4.41, 3.42 and 2.44. 
(3) L. artedi (Le Sueur). Lake Erie cisco or grayback. 
This species occurred in numbers at Merlin next in abundance to L. eriensis 
and appears to occur abundantly throughout the lake. It has been distinguished 
from the jumbo cisco by (1) the somewhat narrower peduncle, (2) the narrower 
body with usually little or no hump at-the nape, (8) the smaller scales with 
less of the shiny appearance, (4) the much slower rate of growth as shown in the 
following table and also later in the discussion of the results of the scale exam- 
nations. 
