C0REG0NU8 HIEMALIS. 31i5 



Ihe head is sub-triangular, rather truncated at the snovit, with the jaws nearly 

 equal, though the upper is slightly the longer. The maxillary bone extends 

 below the front margin of the eye, and the supplementary maxillary is broad 

 and semicircular. 



There are a few minute teeth on the tongue and jaws, though from their 

 small size they may be easily worn away. The eye is rather large, one-quarter 

 of the length of the head, and separated from the snout by its own diameter. 

 As in other species of the genus, the nostrils are close together, midway 

 between the eye and the snout, and rather near the profile of the head. The 

 dorsal and abdominal profiles are moderately convex, as in the Herring. The 

 lateral line is in the middle of the side. The dorsal fin is midway between 

 the snout and the base of the adipose fin ; it is higher than its own base is 

 long. The ventral fin is below the middle of the first dorsal, and the 

 elongated scale at its base is one-third of the length of the fin. The pectoral 

 fin is inserted low down on the throat and is more pointed than the ventral. 

 The anal fin is nearer the caiidal than the ventral ; it is as deep as its base 

 is long. In colour, the back and upper part of the head are dark blue; 

 the sides are paler, often with a tinge of yellow ; the belly and under side 

 silvery. All the fins are dull bluish-black, darkest at the margin. There are 

 one hundred and twenty pyloric appendages to the intestine ; thirty-eight 

 vertebriB in the thorax, and twenty in the tail. 



Coregonus hiemalis (Jurine). 



9 



D. 14, A. 15. Scales : lat. line 76 — 90, transverse -rr 



In the Lake of Geneva is a Coregonus known as la Gravemhe, the same 

 fish in Lake Constance is Krojiffelclten. It occurs generally in the lakes of 

 Switzerland and South Gei*many, such as the Ammer See ; it is also known as 

 Kilck and Kilchen (Fig. 166). 



This species is somewhat smaller than the other German forms of Coregonus, 

 ranging from eight to eleven inches in length. It is chietly caught in the spring 

 and at the close of summer, at spawning-time. It lives in considerable herds 

 at great depths, mostly upon the bottom, where it feeds on small mollusca. It is 

 less prized as food than the other species which occur with it. 



C. Jiiemalis has a shorter body than the other Continental representatives 

 of the genus. The body is four and a half times as long as high (Fig. 166). 

 The length of the head is less than the height of the body ; it is two- 

 ninths of the length of the fish without the caudal fin. The snout is rather 

 short, as long as the eye, obliquely truncated so that the upper jaw projects 



