of the Fishery Board for Scotland. 



297 



of the first dorsal fin was indicated "by a pin which was introduced 

 immediately in front of the first dorsal ray, between it and the anterior 

 border of the dorsal groove (5, ib.) ; a slight cut made with a scalpel, close 

 in front of the first ray, was taken as the commencement of the second 

 dorsal (6, ib.). The anus was located by means of a pin inserted into, or 

 as near as possible to, the genital aperture (7, ib.). The length of the 

 snout was obtained by measuring the distance from the tip of the snout 

 to the point where the perpendicular from the anterior edge of the pupil 

 cut the lateral axis, and adding thereto half the diameter of the pupil 

 (1, ib.). Since the eye is kept in place by two adipose lids which partly 

 overlap, it was almost without exception found to be fixed in a uniform 

 manner. 



