18 k 



Canadian Arctic Expedition, 191S-18 



The genital segment of the male (Fig. 16) exhibits a small lobe and notch 

 on the left side. The genital segment of the female (Fig. 15) carries a large 

 wing-like lobe on the left side, terminating in a recurved hook; this hook is easily- 

 lost, so that the lobe then appears to end bluntly. In side view the segment 

 presents a ventral convexity and two small curved hooks, right and left of the 

 genital opening (Fig. 17). 



The anterior antennae of the female reach to the end of the forebody. Of 

 the 24 segments of which they are composed, numbers 3 to 8 are short and 

 subequal; the antenna breaks readily between the 8th and 9th joints. The 

 right grasping antenna of the male, with the geniculation between the 18th and 

 19th joints, is more like that of Pontella than that of Labidocera (Fig. 18). 



Fig. 18. Paralahidocera. 

 Terminal portion of right antenna of male. 



There is a serrated upraised flange upon joint 17, a serrated border upon joint 

 18, and two toothed edges upon the compound joint 19-21, namely, a long 

 proximal and a short distal comb. The terminal part of the appendage, beyond 

 the bend, consists of three distinct segments, corresponding respectively to 

 joints 19-21, 22-23 and 24-25. This is a generic character, inasmuch as the 

 right anterior antenna of the male Labidocera has four terminal segments, hat 

 of Pontella two. 



In the second or posterior antennae, B2 is fused with Ri 1, the zone of fusion 

 being indicated by a shallow impression at the level of the insertion of a group 

 of two si; measuring Ri from this point, the two rami are subequal in length. 



Fig. 19. Paralahidocera. Second maxiUiped. 



In the seven-jointed second maxilliped (Fig. 19), the inner margin of B2 

 is denticulated as in Labidocera; distally this joint carries two long setae and 



