366 



THE AKGLER-NATUEALIST. 



Herring. They are never seen under any circumstances 

 in the middle of the day. Their spawning-season is from 

 October to December, and they are in their best condition 

 in August and September. 



The Powan rarely grows beyond the length of 15 inches. 

 Its food appears to consist principally of water-insects, 

 larvse, and small red- worms. 



Cliaracteristics of the Powan (Coregonus Cepedei). — Head long and 

 narrow ; length about one-fifth of whole body, tail-fin included, and 

 greater than depth of body at commencement of back-fin. First ray of 

 back-fin commencing halfway between point of snout and origin of 

 tail-fin. Adipose fin large and thin. Anal fin commencing halfway 

 between origin of ventral fins and base of middle tail-fin ray. Ventral 

 fins commencing under middle of back-fin. Breast-fins long and 

 pointed, one-sixth the length of the whole fish, tail-fin included. Tail 

 deeply forked ; long rays of upper portion curving slightly downwards, 

 giving a peculiar shape to the fin. Gill-cover produced behind ; lower 

 margin of giU-cover proper * slanting upwards and backwards. Snout 



* See p. 30. 



