30 k 



Canadian Arctic Expedition, 1913-18 



Anterior antenna 9-jointed, seven-tenths the length of the cephalosome 

 measured in the middle line. Posterior antennae with Re two-jointed (Fig. 39) ; 

 the number and arrangement of setae is subject to variation, as is the relative 

 length of the two joints. 



Fig. 39. Harpacticus superflexus. 

 Base of posterior antenna showing the two-jointed Re. 



The mandible has the structure shown in Fig. 40, both rami of the palp 

 being one-jointed; the outer ramus is the smaller; on the other mandible of 

 this individual instead of the two si of Ri shown in the figure, there was a group 

 of three setae as in Tigriopus (Sars). 



Fig. 40. Harpacticus superflexus. Mandible. 



The maxilla was like that of H. chelifer, with two long plumose setae behind 

 the masticatory claws on B 1, as figured by Sars; below the claws (observed 

 in the male) were two subequal setae with distended proximal portions and 

 long-plumed attenuated distal portions; B2 bifid, the proximal inner smaller 

 lobe carrying two equal plumose setae, the upper larger lobe, a group of setae; 

 Ri and Re both tri-setose. 



First maxilHped (mp 1): B 1 with three setigerous digitiform inner lobes 

 (Li); B 2 is the distal digitiform segment of the appendage, carrying a sub- 



Fig. 41. Harpacticus superflexus. Terminal portion of first maxiUiped. 



distal group of four setae and terminating in the claw or dactylus of the appen- 

 dage; above the claw, and parallel with it, there is a plumose seta, and another 

 smaller seta below it (Fig. 41). 



