58 THE ROYAL SOCIETY OF CANADA 



This species has been found on a wide variety of hosts, although 

 no others have been found on Lepidopsetta bilineata, from which they 

 were previously recorded. They have been found on Gadus macroce- 

 phahis, however, and also on Hexagramm-us decagrammus, Sehastodes 

 pinniger, Scorpœnichthys marmorata, Enophrys bison, Anoplarchns 

 atropnrpiirens and Raja hinoculata. 



Lepeophtheirus pravipes, Wilson 



Lepeophtheinis pravipes. Wilson, Contr. to Can. Biol., 1912, p. 90. 



Numerous specimens of this species have been found on the same 

 host as Wilson recorded, Ophiodon elongatus. Much of the colour is 

 lost in the preserved specimens. In the living specimens, the body is 

 not uniformly orange yellow, but while this forms the ground colour, 

 it is thickly dotted over with reddish brown spots, each consisting of 

 a central portion from which extends numerous processes, that each 

 spot has the appearance of a nerve cell. These are found over the 

 surface of the carapace, free thoracic segment and genital segment. 

 The depth of the colour varies somewhat but the spots were present 

 in all live specimens examined. 



Lepeophtheirus salmonis (Kroyer) 



Caligus salmonis Kroyer, Naturh. Tidsskrift, vol. I, 1838, p. 13. 

 Lepeophtheirus salmonis Wi'lson, Proc. U.S.N.M., vol. 28, 1905, p. 640. 



Wilson, Proc. U.S.N.M., vol. 35, 1909, p. 440. 



Wilson, Contr. Can. Biol., 1912, p. 93. 



Found on all five species of the Pacific salmon, Oncorhynchus, and 

 on the steelhead trout, Salmo gairdneri. It is possible to get any 

 number of this species but the live specimens in general do not agree 

 in every detail with descriptions that have been made from preserved 

 specimens, although there is a large amount of variation in the relative 

 size of parts. In specimens that may be considered typical for this 

 region, the carapace of the female is about one-eighth longer than 

 wide. The genital segment is only a little more than half as long as 

 the carapace and a little over half as wide. The abdomen is nearly 

 as long as the genital segment. There is no segmentation at the 

 constriction. 



In the male the relative size of the parts agrees more nearly. 

 The genital segment is not concave posteriorly but the central portion 

 extends to form a median lobe, where it is attached to the abdomen. 



