88 SALMONIDyE. 



According to Mr. Thompson of Belfast,* the Pollan, or 

 Lough Neagh Coregonus, differs from the Gwyniad of Bala 

 in the following particulars : in the snout not being produced ; 

 in the dorsal fin being nearer the head ; in having fewer rays 

 in the anal fin, and in its position being rather more distant 

 from the tail ; in the dorsal, anal, and caudal fins being of 

 less dimensions ; in the third ray of the pectoral fin being the 

 longest, the first being of the greatest length in the Gwyniad ; 

 and in the ventral axillary scale being longer. The numbers 

 of the fin-rays in the Pollan are 



D. 14 : P. 16 : V. 12 : A. 13 : C. 19. Vertebrae 59. 



In the stomach of a Pollan I found one example of a 

 species of Gammarus. 



The vignette is a view of White well, in the Forest of 

 Bowland, Yorkshire. 



* Reports of Proceedings of the Zoological Society of London for 1835, p. 77. 



