CO BRITISH COFKPODA. 



2. ATTHEYKLLA CRYPTORUM, Brady. PI. LII, figs. 1 



18. 



Canthocamptus cryptorum, Brady. Journal of Microscopical 



Science, vol. ix, pi. vi, figs. 1 10 

 (1868). 



Animal slender, about ^-th of an inch in length ; 

 head united with the first thoracic segment ; posterior 

 borders of all the body-rings finely pectinated. Ante- 

 rior antennae 8-jointed, shorter than the first body- 

 segment (fig. 2), the joints not much differing in 

 length ; the fifth joint in the male much swollen (fig. 3). 

 Mandible-palp (? absent). Inner branch of the 

 posterior antennaa 2-jointed. Posterior foot-jaw (fig. 8) 

 slender, the hand finely ciliated on the inner margin, 

 and terminating in a long, slender, and slightly curved 

 claw. Branches of the first pair of swimming-feet 

 (fig. 9) equal, spinous on the outer margins, the apical 

 spines of each joint very long ; inner branch 2-jointed, 

 the second joint slender and nearly twice as long as 

 the first. Inner branch of the second pair of feet 

 (fig. 10) only half as long as the outer, the first joint 

 only about one fourth the length of the second, which 

 bears two long apical seta3, four shorter setae on the 

 outer and one on the inner margin ; inner branch of 

 the fourth foot (fig. 11) small, 1 -jointed, fringed with 

 three long and three short setae. The inner branch of 

 the third pair (fig. 12) is 1 -jointed, tapering, and ends 

 in an extremely long, plumose seta, at either side of 

 which is a short spine and another plumose seta of 



