40 K 



Canadian Arctic Expedition, 1913-18 



Re three-jointed; Re 1 carries a small proximal si inserted near the middle of 

 the joint, in addition to its distal plumose si; the distal joint of the Ri carries a 

 long spicate seta followed by three geniculate setae, then, near the inner distal 

 margin three strong spines; between the two subdistal spines of this group 

 there is a long curved claw, not described in other species (Fig. 60). 



Fig. 60. D. si cfanssoni cf . Distal joint of inner branch of posterior 

 antenna, viewed from the mesial surface. 



In the mandible, arising from a point near the middle of the Ri, there is a 

 group of three si instead of two si figured by Sars for D. fusiformis; observed 

 in both sexes. In the maxilla, the small club-shaped Re carries three long 

 plumose setae flaring apart as figured by G. S. Brady for D. fusiformis. The 

 armature of mp 2 differs from that of D. fusiformis, the two plumose setae of 

 the basal joint being inserted at the same transverse level instead of one behind 

 the other (Fig. 61). 



Fig. 61. Posterior maxilliped. D. stefanssoni. 



The thoracic legs of the female offer few distinguishing characters: p3 

 Re 3 has eight setae (3 se, 1 st, 4 si); p 3 Ri 3 has six setae (1 se, 5 si); p 4 Re 3 



Fig. 62. D. stefanssoni 9 . P 3 Ri. 



has eight setae; p 4 Ri 3 has five (Ise, 4 si). In the third foot (p 3) the outer 

 distal angle of Ri 2 is produced into a simple cone in place of the mucronate 

 process of the male (Fig. 62). 



