904 ANATOMY AND DEVELOPMENT 



All the above parts lie in the central compartment of the 

 body-cavity. In addition, the accessory glandular bodies or 

 crural glands of the last (i/th) pair of lens are enlarged and 

 prolonged into an elongated tube placed in the lateral com- 

 partment of the body-cavity (ag). 



The arrangement of these parts represented in the figure 

 appears essentially that which Moseley has already described 

 for this species. The dilatations on the vasa deferentia, which 

 he calls vesiculae seminales, is not so marked ; nor can the 

 peculiar spiral twisting of this part of the vas deferens which he 

 figures (No. 13) be made out in this specimen. The testes are 

 placed at different levels in the median compartment of the body- 

 cavity, and both lie on the same side of the intestine (right side). 



The arrangement of the terminal portions of the vas deferens 

 is precisely that described by Moseley. The right vas deferens 

 passes under both nerve-cords to join the left, and from the 

 enlarged tube (/>), which, passing beneath the nerve-cord of its 

 side, runs to the external orifice. The enlarged terminal portion 

 possesses thick muscular walls, and possibly constitutes a sper- 

 matophore maker, as has been shewn to be the case in P. N. 

 Zealandiae, by Moseley. 



In some specimens a different arrangement obtains, in that 

 the left vas deferens passes under both nerve-cords to join the 

 right. 



In addition to the above structures, which are all described 

 by Moseley, there are a pair of small glandular tubes (_/), 

 which open with the unpaired terminal portion of the vas 

 deferens at the generative orifice. 



2. Female Organs. PI. 52, fig. 33. 



The female organs consist of a median unpaired ovary and 

 a pair of oviducts, which are dilated for a great part of their 

 course to perform a uterine function, and which open behind 

 into a common vestibule communicating directly with the 

 exterior. 



Ovary. In the specimen figured the following is the arrange- 

 ment : 



The ovary lies rather to the dorsal side in the central com- 

 partment of the body-cavity, and is attached to one of the 



