544 TEN YEARS IN SWEDEN. 



noses of the two fish, as well as the difference in the size of 

 the eyes and shape of the upper maxillaries (if constant, and 

 they without doubt are so), are quite sufficient of themselves 

 to constitute two good and distinct species. 



Mlsson gives us a fourth species, Goregonus Nilssonii, Yal. 

 (bla sik), and he also describes a second species of vendace, 

 0. wimbttj L. (sik wimma) ; but of these two fish more here- 

 after. 



Dr. "Widigren, who has lately published a treatise on the 

 Scandinavian salmonidce, says cc Of the Swedish eoregoni, 

 which have the upper jaw longer than the under, we can 

 discover three which have different forms at all ages, and 

 which, even in the same water, hold themselves distinct from 

 each other; and these we must consider distinct species, 

 viz. : 



" 0. oxyrhynclms, L. Head small, thin, and pointed. 

 Called in the Wener nabb sik, fit sik ; Wetter, asp. 



" The rarest of all in Sweden. I only know of three cer- 

 tain localities the Baltic, the Wetter, and the Wener. 



" C. fera, Jar. Knubb sik, Nilss. C. Mar vena, Bl. Lof 

 sik. (Wener) . 



' { Nose, as it were, cut off square. According to my ex- 

 perience, is found in all the three above-mentioned lakes, 

 and, by all accounts, it is the species which in Lapland is 

 called the stor sik. 



" G. lavaretus, L. The Powan, Yarr. Sw., Sik gra sik. 

 Is the commonest and widest spread of all the Swedish 

 gwynniads.-" 



B. Jaws even. 



C. Nilsoniij Yal. Is, next to the following, the smallest 

 of all the genus. Specimens of 140 mm. long, which I took 

 in Saggat Trask, up at Quickiock, in June, had already such 

 large roe that they would doubtless have spawned in the 

 following autumn. 



The most characteristic mark of distinction in this species 

 is the form of the head and nose. On account of the flat 

 forehead, and the shape of the under jaw, it rather resembles 



