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



tween the base of the eighth dorsal ray and 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 second ray the longest, equalling the length 

 of the fourth ray of the dorsal ; pectorals short and pointed, 

 one seventh the length of the whole fish, caudal fin included ; 

 the first ray simple, the second and third the longest ; the last 

 short, about one third the length of the first; tail deeply 

 forked with the long rays curving slightly inwards. Gill cover 

 very slightly produced behind; the basal line of union between 

 the operculum and sub-opcrculumvery oblique, the free margin 

 of the latter rounded ; pre-operculum angular. Snout trun- 

 cated, not projecting beyond the upper lip; under jaw rather 

 the shortest ; maxillary broad, extending back to beneath the 

 anterior margin of the orbit. Teeth in the upper jaw long and 

 slender, about six in number ; those on the tongue shorter 

 and more numerous. Eyes large, reaching below the middle 

 of the cheeks ; lateral line commencing at the upper part of 

 the operculum, and running down the middle to the base of 

 the centre caudal ray. Scales large and deciduous, eighty- 

 four in the lateral line, eight between the dorsal fin and late- 

 ral line, and the same number between the lateral line and the 

 base of the ventral. Number of fin rays, 



D. 12 ; P. 16; V. 12; A. 11 ; C. 20. Caeca 116. 



Stomach filled with entomostracous animals, presenting in 

 the mass a granular appearance, and a reddish brown colour. 

 This fish differs from C. Lacepedei in the shortness of the 

 head and pectoral fins, and in the snout not projecting beyond 

 the upper lip, as well as in other respects, as will be best seen 

 by comparing the descriptions and accompanying figures. It 

 is at once removed from C. Willoughbigii of Jardine, the Loch- 

 maben Coregonus, and C. Pollan of Thompson from Loch 

 Neagh, by the under jaw being the shortest. On comparing 

 it with C. Lavaretus of Jenyns, it is a much deeper fish ; the 

 head and pectorals are much shorter, the upper jaw rather the 



