206 



NORTHERN ZOOLOGY. 











Dimensions. 















Inches. 



Lines. 





Inches. 



Lines 



Length 



from 



tip of snout to tip of caudal 



18 



9 



Length 



of attachment of dorsal 



2 



1 



»T 



»j 



end of central rays . 



18 







» 



its longest rays . . . 



2 



1 



)J 



»i 



end of scales 



17 







» 



its last ray .... 







8 



J» 



>j 



anus .... 



12 



9 



j? 



pectorals .... 



2 



2 



» 



» 



ventrals . 



8 



2 



j> 



ventrals .... 



1 



10 



}) 



jj 



dorsal .... 



; 







« 



attachment of anal 



1 



3 



ft 



» 



edge of gill-cover 



2 



9i 



» 



its longest rays . . . 



1 



7 



» 



ji 



nape .... 



1 



11 



» 



lobes of caudal 



2 



6 



>J 



» 



orbit 







7 



» 



its central rays beyond the scales 







11 



!> 



5? 



nostrils .... 







5 



Depth of caudal fork .... 







8 



)» 



of intermaxillaries, vertically . 







24 



Breadth of snout between the articulations of 







» 



labials .... 







6i 



the labials ..... 







2 



» 



lower jaw . . . 







10 



» 



nape ..... 



1 



3 



)» 



lateral line from gill-opening t< 



) 





Depth of body ..... 



3 



6 



end of scales ..... 



14 



3 











[79.] 



Salmo (Coregonus) Labradoricus. (Richardson.) 

 Musquaw River Coregonus. 



Mr. Cumming did me the favour of preparing a specimen of this Coregonus, 

 which inhabits Musquaw River, that falls into the Gulf of St. Lawrence, near the 

 Mingan Islands. The colours and exact form of the body cannot be determined 

 from the dried specimen, but in the shape of the scales and opercular pieces it 

 resembles the Attihawmeg, though its labials, and consequently the orifice of its 

 mouth, are much smaller. 



DESCRIPTION. 



Form. — Body apparently much like that of the Round-fish : its depth is one-fifth of the 

 length, excluding the caudal. Head small, constituting only a sixth part of the distance be- 

 tween the tip of the snout and end of the scales on the caudal. The orbit is exactly twice as 

 far from the edge of the gill-cover as from the tip of the snout. Cranial ridges nearly as in 

 the Round-fish. The labials are a little longer than in that fish, and their posterior pieces are 

 of a different shape, being ovate, whereas they are acutely elliptical in the other. The 

 under jaw measures a very little more than one-half the length of the upper surface of the head, 

 and when the mouth is distended its tip is exactly even with the end of the snout. Jaws and 

 palate toothless : four longitudinal rows of teeth on the tongue. 



Scales orbicular, thin, flexible, and deciduous, seventy- eight on the lateral line, correspond- 

 ing with an equal number of rows on the back and belly. The middle, between the tip of the 

 snout and end of the scales, is at the thirty-second scale of the lateral line, and opposite to the 

 third ventral ray, or tenth dorsal one. A linear inch, measured on the sides, includes seven 

 scales. There are eight scales between the dorsal and lateral line, and as many between the 

 latter and the ventrals. 



