342 LAKE SUPERIOR. 



deeply furcated ; its lobes are pointed. The ventrals are large, tri- 

 angular, regular, the outer margin somewhat longer than the inner ; 

 their extremity is not an inch from the anus ; they are inserted on 

 the lower face of the body, and very near each other ; their base 

 of insertion is rounded ; the cutaneous prolongation of their upper 

 margin is much elongated. The pectorals are elongated and pointed. 



Br. 8 ; D. I, 11 ; A. II, 13 ; C. 7, I, 10, 9, I, 7 ; V. I, 11 ; 

 P. 16. 



This species is from the Pic ; but occurs everywhere along the 

 northern shores. 



COREGONUS ALBUS, LeSU. 



COREGONUS ALBUS Lesu. Journ. Acad. N. Sc. Philad. 1818, L, 232 

 (figured.) 



The general form is elegantly elongated, lanceolate, with very reg- 

 ular outlines. The curve of the back is similar to that of the belly, 

 except that the space on the back, which extends from the nape of 

 the neck to the dorsal, is more arched, whilst, on the belly, it is most 

 arched between the ventrals and the anal. However, in young 

 individuals from five to eight inches long, these two lines present the 

 greatest uniformity. The body is regularly compressed ; the greatest 

 height before the dorsal is contained four times and a half in the 

 length, reckoned from the end of the snout to the end of the scales on 

 the caudal. The thickness is equal to half of the height. 



The head is conical, pointed at its extremity, and more compressed 

 than the body, attenuated below ; it forms the fifth part of the 

 length, excluding the caudal. The skull is rather flattened than 

 convex ; it is sloping as much as the lower surface is raised. The 

 eyes, very large and circular, are situated at the distance of their 

 diameter from the end of the snout, and of twice and a half this same 

 diameter from the posterior margin of the opercular apparatus. The 

 suborbital bones, very much developed, encroach upon almost the 

 whole face, of which a very small and narrow space is left bare above 

 the anterior branch of the preoperculum as far as the posterior ex- 

 tremity of the maxillaries. The nostrils open on the upper face of the 

 rostrum, at equal distances from its extremity and the anterior margin 



