3 IS Tin-: FKESH-WATEK FISHES OF EL'Kol'E. 



equal to the length of the head. The snout is truncated, shorter than the 

 diameter of the eye, which measures little more then one-third of the leng-th 

 of the head. The maxillary bone extends back to below the front margin of 

 the eye. The jaws are equal in length. 



Coregon"as nilssoni (Cuvier and Val.). 



D. 11—1.5, A. 15. Scales: hit. line 85—88. 



This Coregonus has a small head and elongated body; the body, without the 

 caudal fin, being six times as long as the head, while the depth of the body is 

 no more than the head length. 



The truncated snout is rather larger than the eye, the jaws are equal, 

 and the diameter of the eye is from one-fourth to one-fifth of the length of 

 the head. 



It is known from Lake Ring, near Lund, in Sweden, where it is named 

 Bladk, and attains a length of ten to twelve inches. It is said to occur in 

 other lakes in Sweden and Lapland. 



(4.) Sjiecies with the mandif)le lonr/er than the anoiit. 



Coregonus albula (Linn^us). 



D. 12—13, A. 15—10, p. 15—10, V. U, C. I'J. 

 Scales: lat. line 75 — 81, transverse 9/10. 



Coregouus atljida belongs to a division of the genus in which the mandible 

 is longer than the upper jaw, into a shallow notch of which it fits. The head 

 approximates in aspect to that of the Herring. There are five teeth on the 

 tongue. The maxillary bone does not reach back to the eye. The eye is as 

 long, or nearly as long, as the snout, and about one-fourth of the length of the 

 head. The iris is silvery. The fins present no distinctive peculiarities in form 

 or position. The lateral line descends over the pectoral fins and then runs in a 

 straight line in the middle of the body. The dorsal outline is rather more 

 arched than the ventral contour. The colour is greenish-blue above; the sides 

 and belly are silvery. The dorsal, caudal, and adipose fins are grey ; the other fins 

 are colourless. There are fifty-seven to fifty-eight vertebra? in the vertebral 

 column. 



This species is found in the north of Europe, from the Ural region in Russia, 

 to Mecklenburg, Scandinavia, Poland, and Silesia. It never takes the fiy for 

 trout, and is chiclly captured in nets. 



