344 LAKE SUPERIOR. 



anal. The anal itself is much longer than high, and the disproportion 

 between the anterior and the posterior margin is greater than on the 

 dorsal ; the outer margin is concave. The caudal is furcated ; its 

 lobes are pointed. The ventrals are very near each other, and 

 shaped as in C. dupeiformis, and the cutaneous prolongation of 

 their upper margin is long and triangular. The pectorals, little 

 longer than the ventrals, are oblong and less pointed than in C. clw- 

 peiformis. 



Br. 7; D. II. 10; A. II. 11; C. 8, 1. 9, 9,1.7; V. 11; P. 17. 



Lesueur did not give the dimensions of his fish : those which I 

 have procured do not exceed fifteen and a half inches, though I have 

 seen a numerous series of them. I do not know whether they 

 attain a larger size. 



This species is common about the Pic ; but I have also secured 

 specimens from various localities along the northern shores of the 

 lake. 



COREGONUS SAPIDISSIMUS, AgaSS. 



COREGONUS ALBUS TJiomps. N. H. Verm. 1842, 1., 143, (wood-cut) 

 ( White-fish or Lake shad.^) 



"We take as the type of this species the description and the figure of 

 Mr. Thompson, which though much reduced, gives a clear idea of it. 

 We have several individuals twenty-two inches in length, the size 

 of those which Mr. Thompson himself has described. A complete 

 series of young individuals enables us to give a full description, and 

 in order to render it more intelligible we shall begin with the adult. 



The general form is slender, the sides compressed, the back and 

 belly prominent. The space contained between the anterior margin 

 of the dorsal and the occiput is much arched, convex ; and the nape of 

 the neck itself is sometimes very prominent. From the dorsal the 

 line of the back descends abruptly on the tail ; it is somewhat de- 

 pressed immediately behind the adipose fin, and rises somewhat on 

 the insertion of the canclal. The ventral line is almost uniformly 

 convex, but the region situated between the ventrals and pectorals is 

 somewhat more prominent. This line becomes very oblique and 

 ascendant beneath the thoracic region and the head. The greatest 



