L. artedi L. eriensis 
. Length Weight Age } Date Length | Weight| Age 
No. Date em. Oz. Years|| No. Date c.m. Oz. Years 
600 me 8 20.7 6 4 | 234 we 8 20.8 6 / 3 
a is ne orale ere | ang 7 3 
602 pa 21.0 me 6 5 237 f =A Na 7 3 
603 21.5 6 5 . 238 : 22.2 8 3 
604 21.0 6 eS 239 : 22.6 8 3 
605 - 22.2 6 ; 6 . 240 | 22.8 9 2 ; 
606 21.8 6 ; 5 || . 241 ade 9 23.7 9 3 
607 | July 9 : “22.8 i ; 6 | 242 ei 26.5 12 4 
=== || : = —— = — = 
609 22.9 7 5 | 243 21.5 7 3 
610 | al 23.4. ie: 7 ee 5 Ie 244 arte | o L 10 3 
Figure 1 shows a drawing of a scale from specimen No. 606, L. artedi and a drawing of a 
scale from specimen No. 235, L. ertensts. 
The average proportions for 50 individuals as they occurred at Merlin were 
4.26, 3.7 and 2.86. These figures are somewhat different from those given by 
Jordan and Evermann and may be due in part to the fact that the young of 
L. eriensis are somewhat difficult to separate from this species, and in the selec- 
tion of the above 50 individuals rather extreme forms were chosen. There is 
an indication, however, that L. artedi is more closely related to the species of 
the other lakes than perhaps the figures of Jordan and Evermann show. 
(4) L. prognathus (Smith). Lake Ontario deep water cisco or longjaw. 
In both the pound nets and gill nets from Port Dover to Port Maitland 
a cisco occurs very abundantly whose exact identity and relationships have not 
been determined as yet. Dr. B. W. Evermann, to whom ten specimens were 
submitted for identification, refers them provisionally to the species prognathus 
pending further examination of these and additional specimens. The out- 
standing features of this form are the following: (1) the long mandible which 
usually projects beyond the upper jaw and in extreme cases almost hooks over 
it, (2) the relatively long bony snout, (3) the narrow caudal peduncle, (4) the 
shiny appearance of the scales, (5) the rather deeply forked caudal fin. Ina 
great many individuals the above characters are extreme as well as other features, 
as indicated by the following proportions, 4.0,4.2,and3.2. In other specimens 
the proportions are about as follows: 4.3, 3 75, and 2.85. The average for 
148 individuals is 4.22, 3.88, and 2.85. However, Dr. Evermann states that 
L. prognathus varies greatly. Only a single longjaw was taken at Merlin during 
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