some neio Species of Drawida. 527 



of vesicles is greater tlian tlieir breadth by about a fourth, 

 and they occupy more than 2^ segments (9, 10) and nearly 

 the whole of 11. Th« sacs, which are visible through the 

 translucent skin, are attached to the body-wall on the 

 ventro-lateral line, external to the prostates, and round 

 the base of attachment there is a furred white membrane 

 •wliich represents the remnants of septum 9/10. Septum 8/9 

 is also deflected backwards over the testicular vesicles, 

 forming an additional external investment. The testis is 

 a large mushroom-like organ placed about the middle of the 

 vesicle. The funnel is closely attached to it, and the position 

 of the former is externally marked on the inner ridged 

 portion of the vesicle by a rectangular iridescent area, from 

 Avhich the sperm-duct leads oflF. In the first part of its 

 course the duct is spirally twisted, and runs inwards. It 

 doubles backwards, and is entangled in the mass of tubules 

 belonging to the nephridial lobes, blood-vessels, and muscle- 

 fibres. The duct enters the prostate on its posterior face. 

 The sperniiducal gland is a wiiite, cushion-like, spherical 

 body, sessile on the body-Avall iu segment 10 close to the 

 base of septum 10/11. In point of microscopic structure, 

 the gland is in every detail like that of D. sumavarpatana. 

 The atrium is without a papilla. 



The ovisacs are of considerable size, extending backwards 

 up to somite 14 and overlapping the gizzards iu the mid- 

 dorsal line. On opening the worm, the contents, a mass of 

 yellow yolk, tumbled out; the wall of the sac, being exces- 

 sively thin, ruptures on the addition of the slightest pressure. 

 When examined microspically the yellow spherules were 

 found to form a dense covering for the very large ovum. 

 I have not been able to make out what the ovary is like. 

 The oviduct is large and convoluted, and its mouth com- 

 mences at the point of the non-fusion of septa 10/11 and 

 11/12, which, however, adhere everywhere, forming a kind of 

 spacious chamber. The stem and the greater part of the 

 sac, together with the oviduct, are included in this chamber. 

 The duct opens at tlie base of the posterior face of 

 septum 11/12. 



The ampulla of the spermathecal apparatus is situated 

 over the nephridial arch on the posterior face of septum 7/8, 

 to which, however, it is not attached. It is subtriangular 

 in shape, the apex being directed inwards, the anterior 

 and posterior faces converging towards the ventral ridge. 

 Thus in vertical section also the ampull?e are triangular. 

 They are conspicuously white and nestle in the septal grooves, 

 and overlap the hearts and the dorsal vessel. From the 



