THE LOCHLEVEN TROUT. 807 



lig'liter ; gill-cover witli nine round dark spots ; body above the late- 

 ral line with seventy spots ; below it ten ; dorsal fin thickly marked 

 with spots of a similar kind; anterior extremities of the anal and 

 dorsal fins without the oblique dark bands which are so conspicuous 

 and constant in many individuals of S. Fario. First dorsal fin placed 

 half-way between the point of the upper jaw and a little beyond the 

 fleshy portion of the caudal extremity of the body ; all the rays 

 btancbed except the two first ; the third xaj the longest, equalling 

 the length of the long caudal ray; the seventh as long as the base of the 

 fin ; the last considerably more than half the length of the third, equal- 

 ling the length of the middle caudal ray ; fin even at the end (in many 

 specimens it is concave, with tl:e last ray longer than the preceding 

 one.) Caudal fin crescent shaped, the middle ray rather more than half 

 the length of the longest ray ; third ray of the anal fin the longest, 

 equalling the length of the fifth dorsal ray; .the last ray as long as 

 the base of the fin, ventral fin equalling the length of the fifth ray of 

 the anal ; the third ray the longest ; third ray of the pectorals equal- 

 ling the length of the long caudal ray ; the last ray half the length 

 of the fin. Teeth stout and sharp, curved slightly inwards ; thirty- 

 two in the upper jaw, eighteen on the lower ; twelve on each pala- 

 tine ; thirteen on the vomer ; and eight on the tongue. Scales small 

 and adherent, twenty-four in an oblique row between the middle 

 dorsal ray and the lateral line ; flesh deep red ; cseca eighty. Num- 

 ber of fin rays — 



1st D. 12 ; P. 12 ; V. 9 ; A. 10 ; C. 19. 



This fish is considered by most writers on British ichthyo- 

 logy to be identical with Salmo Jar'io or common trout, 

 differing from it only in the colour of the flesh, and in hav- 

 ing no red spots on the sides. It is true that food and sea- 

 son may have a great share in diminishing or increasing the 

 external markings and colour of the flesh;* but they can 

 have no effect in shortening or lengthening the rays of the 

 fins, or in adding numbers to the caecal appendages. 



The diff*erences that exist between S. ccecifer and S.Jar'm 

 are very striking. The pectorals in S. ccectfer when expanded 



• James Stuart Menteath, Esq. of Closeburn, caught a number of small 

 river trout, and transferred them to a lake (Loch Ettrick) where they grew 

 rapidly ; their flesh, which previously exhibited a white chalky appearance^ 

 became in a short time of a deej) red, wliile their external appearance re^ 

 mained the same from the time they were first put in. 



u 2 



