SAIiMONID.E. 



the ventral fin, the row of scales on the back and that of the 

 lateral line not included. The third ray of the pectoral fin 

 the longest. The fin-ray formula is as follows — 



B. 9 : D. 14 : P. 16 : V. 12 : A. 13 : C. 59 : vertebra 59. 



Of these, the first two rays of the dorsal fin, and the first two 

 rays also of the anal fin are short. 



" The colour to the lateral line dark blue, thence to the 

 belly silvery ; dorsal, anal, and caudal fins, towards the ex- 

 tremity, tinged with black ; pectoral and ventral fins of crys- 

 talline transparency, excepting at their extremities, which arc 

 faintly dotted with black. Irides silvery, pupil black." 



In a number of these Pollan from Lough Erne as well as 

 Lough Neagh, the base of the last ray of the dorsal fin is 

 exactly half way between the point of the nose and the ex- 

 treme end of the longest upper caudal ray. Nine rows of 

 scales from the base of the first ray of the dorsal fin to the 

 lateral line, and the same number from the lateral line to the 

 origin of the ventral fin, with eighty-eight scales forming the 

 lateral line. The fin-rays in number on several specimens 

 exactly as stated by Mr. Thompson. 



The vignette represents the bones of the cranium in the 

 genus Coregonus. 



