1. SALMO. 149 



it is a Charr — " a few teeth on the anterior part of the vomer ; " but 

 the author would perhaps have described the teeth of a Sahnon in the 

 same words. Scales very small, A. 10. The caudal fin is large, 

 and very entire, being truncated, with a slight rounding of the angles. 

 C. pyl. 30-36, from 1 to 2 inches long. 



23. Salmo alipes. 



? Salmo stagnalis, Fabr. Faun. Grand, p. 175. 



Salnio alipes, Richards. Nat. Hist. Ajyp. Ross's Voy. p. Ivii, and Faun. 

 Bor -Amer. iii. p. 169, pi. 81, and pi. 86. fig. 1. 



B. 11-12. D 12-13. A. 11. L.lat. 210*. 



Body elongate, head ot moderate size; snout elongate, pointed, 

 with the lower jaw projecting beyond the upper in adult examples. 

 Teeth smaU ; maxUlary elongate, narrow, extending behind the eye. 

 Praeoperculum very short in a longitudinal direction, with a very 

 short lower limb. Operculum and suboperculum very conspicuoiisly 

 and densely striated, the striae radiating from the base of each of the 

 bones. Fins much developedf, the dorsal fin being much higher 

 than long ; pectoral very long, its length being more than one-half 

 of the distance between its root and that of the ventral, which, also, 

 is very long. Adipose exceedingly small. Caudal conspicuously 

 emarginate, even iu old examples. 



Lakes of Boothia Felix and Greenland. 



a-b. Stufied : 32 inches long. Presented by J. Bae, Esq. 

 c. Stirffed : 18 inches long. Greenland. From Capt. JfolboU's 

 Collection. 



Salmo stagnalis, Fabr., is, as Richardson already suggested 

 (p. 178), probably identical with 8. alipes. We possess a stuffed 

 specimen (spec, c) which agrees perfectly with the description given 

 by Fabricius, and differs from S. alipes in those points only which 

 may be due to age. The bones of the head are remarkably thin, 

 and the caudal is forked, its longest ray being twice as long as a 

 middle ray ; dorsal veiy large, pectoral very long. All three speci- 

 mens have lost their vomerine teeth. 



* This always indicates the number of transverse series of scales above the 

 lateral line. 



t Richardson {I. c. p. 1G9) says that, "in the opinion of M. Agassiz, the great 

 lengtli of the fins cannot be regarded as a specific distinction, Trouts inhabiting 

 rapid rocky streams having their fins always much developed." This opinion 

 is not founded on observations in nature. Salmonoids inhabiting such streams 

 are distinguished by short fins, the delicate extremities being worn oflP by the 

 constant activity of those fi^h, whilst individuals inhabiting still waters show the 

 fins proportionally longer. Hence mature specimens have the fins more rounded 

 and shorter, than sterile ones, on account of their greater activity. This, of course, 

 does not exclude the fact that one species may have longer fins than another, and 

 tliat the length of the fins may be a good and reliable character. 



