474 ]\Ir. G. P. Fanan 07i a Ilarpacthi'd Gopepod 



Mandible (fig. 4) with a strong- thvee-toothed cutting- 

 blade; palp very small, nnbranclied, with four setse. 



First maxilla (Hg. 5) appears to consist of a tiattened plate 

 with a curved point ; no sette or loLes could be made out, 

 bnt they mav have escaped notice. 



Second maxilla (fig. 6) two-jointed, clielitorm, the claw 

 finelj' denticulated on the inner edge. 



Maxillipede (fig. 7) with basal joint and chela as in the 

 second maxilla, but with a stronger and sharper claw and a 

 more muscular basal joint. 



First foot (fig. 8) verj' small and feebly chitinized. It is 

 of the same stiucture as in the genus Idya, and the muscula- 

 ture of the exopodite is well developed. The length of the 

 first foot in Idya furcata is about two-fifths of the total length 

 of the animal ; in the present species it is about one-eighth. 

 ' Second foot (fig. 9) very minute, with two-jointed exopo- 

 dite and endopodite, the former with two outer- edge and two 

 terminal setaj, the latter with one outer-edge and two terminal 

 seta?. The muscles in the second basal joint which uiove the 

 exopodite are fairly well developed. 



Third and fourtii feet absent. 



Fifth feet (fig. 10) strongly chitinized, ending in six stout 

 denticulalions, of which the innermost bears a small seta, 

 outer edye with one seta set back a little from the margin on 

 the posterior lace, inner edge with two seta*, situated close 

 together near the point of attachment of the foot, and distal 

 to them a pore in the chitinous margin of the foot which 

 seems to be the mouih of a gland. The fifth feet are articu- 

 lated to either end of a broad, chitinous, transverse ventral 

 plate. Tiie two inner-edge setse of the fifth foot of this 

 species seem to correspond morphologically to the two or 

 three setge on the basal joint of the filth foot ot Idya, the two 

 joints in ChoUdya having become fused. 



Genital openings (fig. 11) as in the genus Idya^ except 

 that the minute seta3 lateral to the oviducal oj)eni:ig are 

 absent. The spermatheca is situated a short distance behind 

 the (jviducal opening, and has a short sig'uoid duct terminating 

 at the indistinct fiiriow, which marks the fusion of the first 

 and second abdomiiud segments. 



Rami of furca (fig. 12) al)OUf one and a half times as long 

 as broad, with one short stout terminal and two lateral setae. 



Egg-sac single, containing a small number of com])ara- 

 tively large eggs. It is fiask-shaped and attached to rhe 

 oviducal o|)ening by its narrow neck. 



Hub. Attached to the inner lace of the arm-meinbrane of 



