38 K 



Canadian Arctic Expedition, 1913-18 



into two thick-based, somewhat blunt acuminations, that of Re 2 larger than 

 that of Re 1 (Fig. 56). In the fourth leg Ri 2 has only one si (Fig. 57); Re :> 

 only seven setae (3 se, 1 st, 3 si). 



ss. 



Fig. 55. A. nasulus 9 . p 2 Ri. 

 Fig. 56. Same, p 2 Re. 

 Fig. 57. Same, p 4 Ri. 



The fifth legs (p 5 9 ) are highly characteristic, with a long and steep declivity 

 occupied by a few spinules, stretching between the two outermost spines of the 

 distal lobe (Fig. 58). Behind the innermost setae of the inner lobes there is 

 seen a chitinous thickening proceeding backwards from the genital opening. 



Fig. 58. Amphiascus nasutus. p 5 9 . 



In the male, the inner ramus of the second foot is transformed in an extra- 

 ordinary manner, as in the type figured by Sars. 



30. Tachidius brevicornis Lilljeborg, 1853. 



Station 4Qv. Creek mouth at Bernard harbour, Northwest Territories, 

 0-1 fathom, July 8, 1915. 



The gathering consisted of seventeen small Harpacticoids, all of this species, 

 all females, and all, with one exception carrying an ovisac. 



Length 0-76 mm.; eggs counted in five ovisacs: 39, 43, 44, 44, 53. Arrange- 

 ment of the setse on the rami of the natatory legs p 1 to p 4 and dorsal crescentic 



