A NEW COPEPOD FROM A AIARSH CRAB — HUMES 381 



lateral angle a seta bearing a comb of three teeth, on the medial 

 distal angle two setae the dorsal one of which is set upon a single- 

 jointed pedicel, and terminally a long anal seta, which is about three- 

 quarters of the body length, curved distally toward the midline and 

 finely plumose. At the ventral distal angle of the anal laminae one 

 or two very minute setae and anterior to the base of the most ventral 

 of the three lateral setae a vertical row of three very small setae. 



Anterior antennae (fig. 18, c) with eight similar podomeres, joints 

 not strongly chitinized, numerous setae ventrally, a tuft of setae ter- 

 minally, two setae on the dorsal side of the seventh podomere. On 

 the distal ventral angle of the fourth podomere a dimerous athetask 

 slightly longer than the distal four podomeres, the distal jiart about 

 one-third the length of the M'holc. 



Posterior antennae (fig. 18, h) somewhat shorter than the anterior 

 pair, with two podomeres and monomerous exopod; a single spine 

 on the inner margin of the proximal podomere; cylindrical exopod 

 attached near the center of the outer margin of the first podomere, 

 terminating in three setae the longest of which is posterior and the 

 shortest anterior. Distal podomere about two-thirds the length of 

 the proximal one, armed on the inner side with two rows of four 

 dentiform setae and on the outer side with two short setae ; terminally 

 with seven setae, the inner three pectinate on the distal two-thirds 

 and shorter than the adjacent three outer ones, which are pectinate 

 only at their centers; outer seta short, pectinate, with longer and 

 finer teeth; an eighth spiniforrn seta at the base of the second inner 

 seta. 



Mandibles (fig. 18, I) minute, about 15/x long, the outer ramus very 

 small, simple, monomerous, terminating in three short, blunt, spine- 

 like processes; inner ramus flattened into a concave lamina or blade, 

 armed distally with a row of minute setae. First maxillae (fig. 

 18, in) with a cylindrical monomerous exopod bearing two setae ter- 

 minally and three filamentous setae on the inner side; endopod sim- 

 ilar, with four setae terminally; a single seta on the basipod lateral to 

 the base of the exopod. Second maxillae (fig. 18, A) with a thick- 

 set exopod terminating in a long, curved claw pectinate on the distal 

 half of its inner margin ; two small setae on the outer side of the dis- 

 tal end of the exopod; endopod cylindrical, shorter than the exopod, 

 with two setae on the distal end. Maxillipeds (fig. 18, e) with two 

 podomeres, the first short and stout, the second longer and swollen 

 with a long, slender terminal claw pectinate on the concave side and 

 curved to fit the side of the second podomere : a longitudinal row of 

 six to eight very fine setae near the distal end of the first podomere. 



First four pairs of legs biramose, somewhat flattened, the first pair 

 of legs adapted for clasping, the following three for swimming, the 



