26 K 



Canadian Arctic Expedition, 1913-18 



The caudal furca is as long as the anal segment (Fig. 31): there is a short 

 strong spine on the outer margin of each ramus and, more distally, a group 

 of two slender auxiliary setae. 



Fig. 31. Ectinosoma neglectum d". 

 Left ramus of caudal furca from above. 



Fifth feet (p. 5 c?) have the marginal spines not exactly with the same 

 interrelative lengths as figured for the type by Sars, but the anterior or appen- 

 dicular seta arises from the distal joint near the base as in the original (Fig. 32). 



OJLl 



Fig. 32. Ectinosoma neglectum. 

 Fifth feet with part of urosome. 



Swimming feet (pl-p4) show some variation in arrangement of setae in 

 different individuals and even on the two sides of one. All the Ri 3 have five 

 setae (1 se 4 si); pi Re 3 has six setae, as in E. sarsi (3 se, 1 st, 2 si); p 2 Re 

 3 has seven setae (3 se, 1 st, 3 si) instead of eight in E. sarsi; p 3 Re 3 has eight 

 setae (3 se, 1 st, 4 si) ; in two specimens the proximal se of p 3 Re 3 was absent 

 on one side, in another the full number occurred on both sides; p 4 Re 3 has 

 seven setae (2 se, 1 st, 4 si). 



23. Ectinosoma finmarchicum (T. Scott, 1903.) 



Station 27 t, u. See Table IV. 



Female of 1-07 mm., carrying a yellow ovisac in the preserved state. An- 

 terior antennae 6-jointed; p 2 Re 3 with seven setae as in E. neglectum. Upper 

 lip bluntly rounded. The fifth legs have the inner seta of the lamellar process 

 and the middle seta of the distal lobe equal and longer than the rest (Fig. 33). 

 The appendicular seta arises from the distal lobe near the base, whereas in 



