LOCHLEVEN TROUT. 119 



exhibit a small ridge in the centre of each, not perceived in 

 other Trout : in its large and strong fins, and in its habit, as 

 stated by Dr. Parnell, of spawning in spring, it differs from 

 S. fario, which spawns in autumn, and resembles some of the 

 large species of Trout of the great northern lakes. Three in- 

 dividuals of the Lochleven Trout dissected by Dr. Richard- 

 son had each seventy-three pyloric cseca, and in one of them 

 fifty-nine vertebrae were counted. The largest of the speci- 

 mens measured twenty inches and a quarter, including the 

 caudal fin, and two inches less to the end of the scales. 



Dr. ParnelFs description, taken from a specimen measuring 

 one foot in length, is as follows : " Head rather more than 

 one-fifth of the whole length, caudal fin included ; depth be- 

 tween the dorsal and ventral fins less than the length of the 

 head. Gill-cover produced behind; basal margin of the 

 operculum oblique ; preoperculum rounded ; end of the max- 

 illary extending back as far as the posterior margin of the 

 orbit. Colour of the back deep olive green ; sides lighter ; 

 belly inclining to yellow; pectorals orange, tipped with grey; 

 dorsal and caudal fins dusky ; ventral and anal fins lighter ; 

 gill-cover with nine round dark spots ; body above the lateral 

 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 branched except 

 the two first ; the third ray 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, equalling the length of the middle caudal ray ; fin even 

 at the end (in many specimens it is concave, with the last ray 

 longer than the preceding one) ; caudal fin crescent-shaped, 



