132 KENDALL: NEW ENGLAND SALMONS. 



8.4-mch male parr only. The Grand Lake 17.6-inch breeding male equals the 24.8-inch 

 non-breeding female of the Atlantic salmon. The 18.9-inch breeding female Sebago 

 salmon, the 19.3-inch breeding female Grand Lake fish, and 21.9-inch non-breeding male 

 Sebago salmon, equal the 20.3-inch non-breeding and the 28.6-inch breeding females 

 of the Atlantic salmon. The 16.5-inch Sebago female is 2 per cent lower than the 16.3- 

 inch Atlantic female. These proportions for the snout indicate only that the lake 

 salmon, particularly the Presumpscot fish, average somewhat lower than the Atlantic 

 salmon. 



Maxillary. — Only the 21.9-inch non-breeding male Sebago salmon is not represented 

 in the proportions of the Atlantic salmon. This average may be distrusted since all the 

 proportions of male lake sahnon are aUke. However, there are two length-classes of 

 female lake salmon with proportions of only one per cent lower, which equal the pro- 

 portion of only one length-class of Atlantic salmon, i.e., the 16.5-inch non-breeding 

 Sebago female and the 19.3-inch breeding female of Grand Lake which equal the 28.3- 

 inch breeding male Atlantic salmon. 



The proportions of the maxillary of the male Atlantic salmon increases from the parr 

 to the breeding male, which exceeds the male and female parr (which are alike) by 

 three per cent. The proportions of the maxillary of the female Atlantic salmon remain 

 the same from the 6.5-inch Atlantic parr up to, and including the 28.6 inch breeding fe- 

 male of the Atlantic salmon. The 29.3-inch non-breeding female is two per cent higher 

 than the others. 



The proportions of the maxillary of the male lake salmon are unchanged from the 12.8- 

 inch Presumpscot male (which is two per cent higher than the 6.5-inch Atlantic parr) 

 up to, and including the 25.5-inch Sebago breeding male, excepting that of the 21.9- 

 inch non-breeding Sebago male above mentioned. The proportion of the latter is higher 

 than any other either of lake or Atlantic salmon. The percentile proportions of the 

 maxillary of the lake salmon average higher than those of the Atlantic salmon in both 

 sexes, even disregarding the 21.9-inch male. The proportional length of the maxillary, 

 then, may be regarded as a distinctive character, at least as far as the present averages 

 indicate. 



Mandible. — The proportions of the mandible in the Grand Lake 17.6-inch breeding 

 male, the 16.5-inch and 21.9-uich non-breeding females, and the 25.5-inch breeding 

 Sebago male equal none of the proportions of the Atlantic salmon. But the 13.2-inch 

 non-breeding and the 14.8-inch breeding Presumpscot females, as well as the 18.9-inch 

 breeding Sebago female have the same proportion as the 28.6-inch breeding female 

 Atlantic salmon. The proportion of the 17.6-inch Grand Lake male is one per cent lower 

 than that of the 28.3-inch breeding Atlantic male. The 25.5-inch Sebago breeding 

 male exceeds all the other length-classes of Atlantic or lake salmon, being four per cent 

 higher than the 28.3-inch breeding male Atlantic salmon in this proportion. The propor- 

 tions of both males and females of Atlantic salmon increase regularly with the increase in 

 length of the fish, but the lake salmon are irregular in this respect. The largest length- 

 class of each sex has a higher proportion than the smallest length-class of each. 



