FISHES. 531 



And this is Malingren^s opinion j for, when speaking of 

 the Finland salmon, he says : 



' ' In Ladoga we meet with a form of sea salmon which 

 Dr. Widigren declared to be identical with those that 

 inhabit the Wener, in Sweden. I am myself convinced 

 that this Ladoga salmon is not a distinct species, but a con- 

 fined form of the sea salmon, its character changed by 

 thousands of years' residence in fresh water. I propose, 

 therefore, that this Ladoga salmon shall be considered as a 

 variety of the salmo salar (trutta salar, Sieb.), under the 

 name of trutta relicta. 



" The T. relicta which we take in Finland differs at the 

 first glance from the common trutta salar, Sieb. (S. salar, 

 L.), on account of the smaller size and the different distri- 

 bution of the black spots on the body. Trutta salar has in 

 general few spots, and these mostly placed above the 

 lateral line, whereas in the trutta relicta the spots on the 

 front part of the body extend below the lateral line, and are 

 spread pretty thickly in front of the pectorals behind the gill 

 covers. Trutta relicta seldom reaches a weight of more than 

 20 Ib. ; its general size appears to be 10 to 12 Ib. They 

 shed the teeth on the vomer much sooner than the sea 

 salmon. In all which I have examined, even among the 

 smaller ones which only weighed 4 to 6 Ib., I could 

 detect no sign of a row of teeth remaining on the back 

 part of the vomer, whereas in the S. salar I have often 

 found them remaining in a specimen of 8 Ib. In the T. 

 relicta three or four teeth always sit in a cross row in front 

 of the vomer. The male of the sea salmon has always in the 

 spawning season a large crook on the under jaw, but in the 

 male of trutta relicta this is small, often nearly imper- 

 ceptible. 



' ' The roe cones in trutta relicta are much smaller than 

 those of the sea salmon, and appear to hatch some weeks 

 earlier ." 



There seems a mystery as to the spawning habits of the 

 Wenerns silfver lax. Mr. Lloyd remarks: "What became of 

 them in the spawning season was always a mystery to us, 



