[fraser] COPEPODS PARASITIC ON FISH 59 



Although the abdomen is constricted at a point about one-third of the 

 length from the base, there is no further evidence of segmentation. 



Although they vary much in size, none of them are nearly so 

 large as those described by Wilson. An average size would give the 

 following measurements: Female: Total length 9-6 mm., length of 

 carapace 4-75, width 4-25, length of genital segment 2-5, width 2-25, 

 length of abdomen 2-3. Male: Total length 5-8 mm., length of 

 carapace 3-5, width 3-2, length of genital segment 1-26, width 1-16, 

 length of abdomen 0-97. 



The ground colour is yellow but there is a strong and intricate 

 mottling of reddish brown, which varies much in brightness in different 

 specimens. In some cases it is so dark that it gives a dark colour 

 to the whole specimen. 



ECHTHROGALEUS COLEOPTRATUS (Guérin) 



Dineniatura coleoptrata Guérin, Iconographie du Règne animal, 1837, 



pi. XXXV, Fig. 6. 

 Eclithrogaleus coleoptrakis Wilson, Proc. U.S. N.M., vol. 33, 1908, 



p. 367. 

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

 p. 452. 



Two specimens were obtained from a shark (species undeter- 

 mined) caught in Northumberland channel, Sept. 21, 1916. The 

 specimens reported from Unalaska by Wilson were also from a shark. 



Family CHONDRACANTHID/E 



Chondracanthus deltoideus new species 



PI. V, Figs. 77-80, PI. VI, Figs. 81-83 



Female. — General shape of the body short and stout. Céphalo- 

 thorax nearly circular but with very slight lobes at the posterior end 

 of the lateral margin, distinctly separated from the remainder of the 

 thorax; about three-fifths as wide as the thorax; there is a definite 

 median line dorsally. Second and third segments of the thorax are 

 distinct; the second narrower than the céphalothorax, the third the 

 same width as this. The remainder of the thorax shows an indication 

 of division ventrally but not dorsally; it becomes wider posteriorly. 

 The posterior lobes together at their bases are practically the whole 

 width of the body; the tapering takes place on the inside only and the 

 length is about equal to the width at the base. There are no definite 

 lateral lobes. The genital segment is small, about one-fifth the width 



