18 E 



Canadian Arctic Expedition, 1913-18 



12 joints; accessory flagellum 2-jointed, but not as long as the 1st joint of pri- 

 mary. 



Antenna 2 with 4th joint of peduncle longest; flagellum 6-jointed, and about 

 as long as the 4th joint of peduncle. 



Side-plates 1-3 about as deep as their segments, with sides parallel and lower 

 edges evenly rounded and provided with setae. Side-plate 4 deepest, with 

 upper half of posterior border rather deeply emarginate, and lower border and 

 lower half of posterior border provided with setae. 



Figure 4. Sijnurella johanseni, n. sp. 



1 Head and antennae. S Accessory flagellum enlarged. S Maxilla 1. 4- MaxiUa 2. 

 5 Maxillipeds. 6 Lower lip. 7 Upper lip. 8 Mandible. 9 Seta of molar enlarged. 



Mandible; 3rd joint of palp a little shorter than 2nd, armed at apex with 4 or 5 

 long bristles and at the upper part of the front edge with a row of fine bristles ; front 

 edge of 2nd joint with 5 or 6 long bristles. Molar projecting considerably from 

 surface of mandible, and provided on inner edge of grinding surface with a very 

 finely pinnate seta which is as long as the molar; on edge opposite seta is a 

 group of minute spines; grinding surface covered with fine, sharp teeth. 

 Maxilla 1; inner plate with 6 or 7 plumose setae; outer plate with 7 stout spines, 

 some of which are notched; palp with row of spines at apex, below which are 

 scattered setules. Maxilla 2; inner plate with seta on apex and on inner margin; 

 outer plates with setae at apex. Maxillipeds; inner plates with notched spines 

 at apex; outer plates with spines at apex and on inner edges. Lower lip normal. 



