86 TREATISE ON FLY-FISHING. 



singular part of the fish is the conical, bag like 

 appearance, which adheres by its base to the abdo- 

 men. This bag is about two-eighths of an inch in 

 length, of a beautiful transparent red, very much 

 resembling a light red currant. The body also pre- 

 sents another singular appearance, namely, a fin or 

 fringe, resembling that of the tail of the tadpole, 

 which runs from the dorsal and anal fins to the 

 termination of the tail, and is slightly indented. 

 This little fish does not leave the gravel immedi- 

 ately after its exclusion from the egg, but remains 

 for some time beneath it, with the bag attached, 

 which contains its supply of nourishment. 



On the 24th June, Mr. Shaw found the bag had 

 disappeared, but the symmetry of the form was 

 as yet but imperfect. At the end of two months, 

 (7th July) the shape was much improved. At the 

 age of four months (7th September) the charac- 

 teristic marks of the parr or samlet were partly 

 developed. Two months later (six months old 

 7th November) the average length was three 



