BY E. J. GODDARD. 



335 



The vasa deferentia wind about in the ventral lacuna, and even- 

 tually pass into the seminal vesicles, which grade into the 

 ejaculatory ducts each of which expands terminally into a thick- 

 walled " horn " which, uniting with the terminal " horn " of the 

 •other side, opens to the outside by the male genital aperture. 

 The junction of the terminal "horn" and ejaculatory duct, 

 Whitman has shown to be the formation and extrusion of the 

 spermatophore. 



In Qlossiphonia australiensis there are some points of differ- 

 ence from other species. The "horn" and the ejaculatory por- 

 tions of the vasa deferentia are 

 -exceedingly thick and muscular. 

 From the male genital aperture 

 there is a narrow passage leading 

 vertically to the junction of the 

 two terminal horns. Each horn is 

 spindle-shaped, and directed obli- 

 quely upwards, outwards, and for- 

 wards to lead into the ejaculatory 

 duct. This duct turns towards the 

 ventral side, and runs back in that 

 position as far as the level of 

 the male aperture, where it turns 

 sharply towards the dorsal side. It 

 now runs for some distance between 

 groups of dorsi-ventral muscles in 

 a space which represents a cornual 

 and anterior prolongation of the 

 median lacuna; on a level with 

 the lumen of the proboscis. 



On reaching the region of the first ovarial pouches it turns 

 sharply again to the dorsal side, and runs immediately dorsal 

 and parallel to the pouch on each side of the body in the large 

 lacuna which is here crescentic in shape, and surrounds the 

 proboscis laterally and ventral ly. In the region of the first pair 

 of testes it turns sharply so as to run obliquely downwards and 



Fig. 8. — Glossiphonia austra- 

 liensis, sp.n. Diagram of male 

 reproductive ducts. 



