154 lllCHAliD EVANS. 



communicates with a seminal vesicle which is oval in shape, 

 and debouches into a vas deferens (PI. 14, fig. 9, v. d.). The 

 right vas deferens passes backwards and, after a short course, 

 crosses to the left side, passing under the ductus ejacula- 

 torius in doing so. Having crossed over it unites with its 

 fellow to form the common duct, which is coiled on the left 

 side of the intestinal tract, and which ends in the ductus 

 ejaculatorius (PI. 14, fig. 9,c.j. d.). Fig. 9 on Plate 14 shows 

 the male generative organs magnified about four times linear, 

 and considerably displaced to show the parts. The male also 

 possesses a pair of male accessory glands, which extend as 

 far forwards as the twenty-first pair of legs (fig. 9, ?h. a. g.). 



The Female Generative System. — The female genera- 

 tive organs are typical of those of the species found in South 

 America (PL 14, figs. 10 and 11). The ovary is small, and is 

 attached to the fioor of the pericardium in the region of the 

 twenty-fifth pair of legs in specimens jDossessing twenty- eight 

 pairs (fig. 10). The ova are small and endogenous. There is 

 a pair of receptacula ovorum, the end sacs of which are 

 small, and communicate with the funnel by a constricted neck 

 (PL 14, fig. 11, re.o.). The receptacula seminis are well 

 developed, oval in shape, and may be easily seen with the 

 naked eye (tig. 11, re.s.). The uteri pass forward so us to 

 form two ascending limbs, which on turning back form the 

 descending ones, which end in an extremely short vagina 

 (fig. 10, ut.). In the pregnant female the uteri contain 

 embryos in all stages of development, ranging from the 

 segmentation stages to young individuals possessing all the 

 characters of the adult, save that they arc lighter in colour. 



Summary or Characters. 



1. Six of the females are larger in size than the male. 



2. The male specimen has twenty-four pairs of appendages. 



3. One female has twenty-seven pairs of appendages, while 

 the other seven luivo twenty-eight. 



4. The renal apertures of tlie fourth and fit'tli pairs of legs 



