48 THE ROYAL SOCIETY OF CANADA 



Egg strings almost cylindrical, but tapering slightly from anterior to 

 posterior, longer than the body and two-thirds the width, eggs in 4 to 

 6 longitudinal rows with about 20 eggs in each row. 



First antennee short, reaching about half way along the second 

 segment of the second antennae, six-jointed, well provided with setae, 

 two on first joint, four on second, two on third, two on fourth, two 

 lateral and a terminal on the fifth and three terminal on the sixth. 

 Second antenna with length equal to width of carapace, distinctly 

 four-jointed; basal joint short, with a large globular swelling, whose 

 diameter is twice as great as the diameter of the main portion of the 

 joint; second joint longer than the first, smooth; third joint with a 

 ridge going partly around the base, and a blunt spine or tubercle on 

 the inner surface of the claw which is not very strongly curved. Mouth 

 parts small. The mandibles are wide and are fringed with long hairs, 

 the palp is slender and the hairs on.it are short. The first maxilla is 

 small and the two setae are short. The second maxilla is enlarged at 

 the end of the terminal joint to be somewhat clavate, this clavate 

 portion is well provided with hairs. 



In the four pairs of swimming legs, the endopod is larger than the 

 exopod in each instance except in the case of the third where they are 

 nearly equal in length; all the rami are three-jointed with the ex- 

 ception of the fourth exopod which is one-jointed. The fifth legs are 

 small with a basal portion and a terminal claw or seta. The arrange- 

 ment of the spines and setae on the four pairs of legs are as follows: 

 first exopod, I-O, 0-1, II-5; endopod, 0-1, 0-1, 1-3; second exopod, 

 0-0, 0-1, 1-5; endopod, 0-1, 0-1, 1-4; third exopod, 0-1, 0-2, 0-5; endo- 

 pod, 0-1, 0-2, 1-4; fourth exopod, 1-4; endopod, 0-1, 0-2, 1-4. Total 

 length 0-78 mm., length of carpace 0-51, width 0-30, depth 0-39; 

 length of egg strings 0-82, width 0-21. 



{turgidus — referring to basal joint of antennae). 



Found on gill filaments of the sm.all viviparous perch, Cymatogas- 

 ter aggregatus. No males were obtained. 



Family ARGULID^ 

 Argulus Borealis Wilson 



Arguliis borealis. Wilson, Contr. to Can. Biol., 1912, p. 84. 



Specimens of this species have been found on Lepidopsetta M- 

 lineafa, the host from which they were originally described, and also 

 on Hippoglossoides elassodon. 



