342 DISCOVERY REPORTS 



end of the setigerous lobe (Figs. 21 and 22). A wide furrow runs between the inner and 

 middle lobes, the whole structure being now adult and very heavily chitinized. 



Both pairs of modified endopods are very markedly setose, but for the sake of clearness 

 no attempt has been made to show this in the figures. 



FEMALE REPRODUCTIVE SYSTEM 



The smaller female post-larval specimens exhibit no sign of external sexual modifica- 

 tions, but on dissection the rudiments of the reproductive system can be distinguished 

 in specimens 18-20 mm. in length. 



oy s g I t b ov od sgl ov 



Fig. 23. Dissection to show female reproductive system (half-grown), x 15. od, oviduct; ov, ovary; 

 sgl, shell glands; sp, spermatophore ; th, thelycum. Coxopodite of sixth thoracic leg partly removed to 

 show thelycum. 



The ovary lies partly on the liver and below the heart, and partly in the abdomen above 

 the intestine on the abdominal muscles (Fig. 23). 



Both Zimmer (1913) and Raab (1915) described the ovary as consisting of a median 

 anterior part joining two lateral lobes, which are contiguous in the middle line. There 

 seems little reason for this differentiation, since these three parts are not clearly defined 

 in either young or old specimens (Figs. 240 and b). 



In the early stages of development, the ovary consists of a number of follicles, 



