1 . SALMO. 149 



it is a C'harr — " a few teeth on the antex'ior part of the vomer ; " but 

 tlie author Avould perhaps have described the teeth of a Salmon in the 

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

 and very entiffe, 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. Granl. p. 175. 



Salmo alipes, Richards. Xat. Hist. App. Ross's Voy. p. Ivii, and Faun. 

 Bor.-Amer. iii. p. 169, pi. 81, and pl. 80. fig. 1. 



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



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

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

 Teeth small ; maxillary elongate, narrow, extending behind the eye. 

 Pra^operculum very short in a longitudinal dii'cction, -ndth a very 

 short lower Umb. Operculum and suboperculum very conspicuously 

 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 in old examples. 



Lakes of Boothia Felix and Greenland. 



a-b. Stuffed : 32 inches long. Presented by J. Eae, Esq. 

 c. Stuffed : 18 inches long. Grreenlaud. From Capt. HolboU's 

 Collection. 



Salmo stagnalis, Fabr., is, as Richardson ah-eady suggested 

 (p. 178), probably identical with /S. alipes. "NVe 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 very 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. 



+ Eichardson (/. c. p. 169) says that, "in the opinion of M. Agassiz, the great 

 lengtli of the fius 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. Sabnonoids inhabiting such streams 

 are distinguislied by short fins, the delicate extremities being worn ofl' by the 

 constant activity of those fish, whilst individuals inhabiting still waters show the 

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

 and sliorter, 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 

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



