162 Mr. R. Parnell on the Coregoni of Loch-Lomond, 



The long-nosed Powan, Coregonus Lacepedei, Parnell. 



Description : from a specimen of fourteen inches in 

 length. Head long and narrow, of an oval form, about one 

 fifth the length of the whole fish, caudal fin included ; depth 

 of the body between the dorsal and ventral fins less than the 

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

 with the margin of each scale well denned 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 

 base of the short lateral caudal rays; the first ray simple*, 

 the rest branched ; the second and third the longest, equalling 

 the length of the pectorals ; the seventh as long as the base 

 of the fin ; the last one third the length of the fourth ; adi- 

 pose fin large and thin, situate midway between the base of 

 the fourth dorsal ray and the tip of the long ray of the caudal 

 fin ; anal fin commencing half-way between the origin of the 

 ventrals and the base of the middle caudal ray ; the first ray 

 simple, the rest branched ; the second rather the longest ; the 

 third as long as the base of the fin ; the last half the length 

 of the fifth; ventrals commencing under the middle of the 

 dorsal ; the third ray the longest, equalling the length of the 

 same ray of the dorsal ; pectorals long and pointed, one sixth 

 the length of the whole fish, caudal fin included ; the first ray 

 simple ; the second and third the longest, the last short, not 

 one fourth the length of the first ; tail deeply forked, with the 

 upper portion of the long rays curving slightly inwards, giving 

 the fin a peculiar form. Gill-cover produced behind; the 

 basal line of union between the operculum and sub-operculum 

 oblique ; the free margin of the latter slightly rounded ; pre- 

 operculum angular ; snout prominent, somewhat of a conical 

 form, extending beyond the upper lip ; jaws of unequal length, 

 the lower one the shortest. The maxillary bone broad, the 

 free extremity extending back to beneath the anterior margin 

 of the orbit. Teeth in the upper jaw long and slender, about 



* The first three short simple rays of the dorsal fin, and the short lateral 

 rays of the caudal, are not here taken into consideration, as when recent 

 they are liable, from their size, to be overlooked. 



