60 BRITISH COPEPODA. 
2. ATTHEYSLLA cRYPTORUM, Brady. Pl. LII, figs. 1— 
IS. 
Canthocamptus cryptorum, Brady. Journal of Microscopical 
- Science, vol. ix, pl. 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 antennee 8-jointed, shorter than the first body- 
seement (fig. 2), the joints not much differmg in 
length ; the fifth joint in the male much swollen (fig. 3). 
Mandible-palp (? absent). Inner branch of the 
posterior antennee 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 sete, four shorter sete on the 
outer and one on the inner margin; inner branch of 
the fourth foot (fig. 11) small, 1-jomted, fringed with 
three long and three short sete. The inner branch of 
the third pair (fig. 12) is 1-jomted, tapering, and ends 
in an extremely long, plumose seta, at either side of 
which is a short spine and another plumose seta of 
