Mr. R. Parnell on the Coregoni of Loch-Lomond. 163 



six in number ; those on the tongue shorter and more nume- 

 rous. Eyes large, extending below the middle of the cheeks ; 

 lateral line commencing at the upper part of the operculum, 

 and running down the middle of the sides to the base of the 

 middle caudal ray. Scales large and deciduous, eighty-four in 

 the lateral line, eight between the dorsal fin and lateral line, 

 and the same number between the lateral line and the base of 

 the ventrals. Number of fin rays, 



D. 12 ; P. 16 ; V. 12 ; A. 11 ; C. 20. Coeca 120. 

 This fish occasionally grows the length of sixteen inches, and 

 is distinguished by the great length of the head compared to 

 that of the body ; the snout extending beyond the upper lip ; 

 the under jaw the shortest ; the length of the pectoral and 

 dorsal fins ; the large scales ; the number of rays in the anal 

 fin, the peculiar shape of the caudal, and the position of the 

 dorsal fins. It agrees in figure with the Salmo Wartmanni of 

 Bloch, but not in description. In the stomach of one of the 

 specimens I examined were found several species of entomo- 

 straca, larva of insects, a few coleoptera, a number of small 

 tough red worms little more than half an inch in length, and 

 about the thickness of a coarse thread, besides a quantity 

 of gravel which the fish had probably accumulated when in 

 search of the larva. 



The short-headed Powan, Coregonus microcejihalus, Para. 

 Description : from a specimen thirteen inches in length. 

 Head short, of a triangular form, one sixth the length of the 

 whole fish, caudal fin included ; depth of the body between 

 the dorsal and ventral fins considerably more than the length 

 of the head. Colour of the back and sides dusky blue, with 

 the margin of each scale well defined by a number of minute 

 dark specks; belly dirty white ; the lower portion of the dorsal, 

 caudal, pectoral, ventral, and anal fins dark bluish grey; irides 

 silvery ; pupils blue. First ray of the dorsal fin commencing 

 half-way between the point of the snout and the adipose fin ; 

 the first ray simple, the rest branched, the second and third the 

 longest, more than equalling the length of the pectorals ; the 

 sixth as long as the base of the fin, the last one third the length 

 of the fourth ; adipose fin large and thin, situated midway be- 



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