238 Proceedings of the Royal Society of Victoria. 



larger forms, where it extended to the end of the sixtli segment 

 (Fig. 3), and in these the shape was more conical. The opening 

 at the end of the ovisac is guarded by two somewhat protuberant 

 lips, the dorsal one somewhat overlapping the ventral one. • On 

 the ventral surface in the mid axis, towards the anterior end, the 

 wall of the ovisac projects to form a prominent and somewhat 

 narrow I'idge, or lip ; this possibly is of use during copulation. 



In males the testes (Fig. 4) of each side mostly lie near the 

 surface in the first segment of the metasome, which is somewhat 

 swollen, and this portion of them is very much coiled, and plainly 

 to be seen from the outside. From this segment they extend into 

 the third segment, but run further from the surface in a straight 

 line on each side of the intestine, and are only to be seen on 

 careful dissection. On this account it may be that Dr. Richters' 

 description is due to a mistake, for he says that this species is 

 peculiar to the genus in that the testes are only situated in the 

 first segment of the tail. 



The vas deferens of each side runs directly into the second 

 segment, and protrudes outwards for a short distance; this portion, 

 which I refer to in this paper as the sheath of the penis, is partly 

 guarded by an angular projection of the wall of the segment. 

 Several specimens were noticed with two long and comparatively 

 stout cylindical processes, the penes, comparable to the cirri of 

 some writers, which were bent outwards and landwards in the 

 form of a sickle (Figs. 5 and 6). These have the distal half of 

 the surface facing inwards very rugose, while more proximally 

 there are several stout spines. The outer surface has the distal 

 half thickly studded with minute spines, and along the whole 

 length of each side there is a longitudinal row of stout, acute, 

 re-curved spines, with swollen bases, which increase in size 

 proximally. 



On dissecting a specimen in which the penes were not project- 

 ing outwards it was found that each were lying reflected back- 

 wards (introverted) within the lumen of their respective siieath, 

 with the distal extremity extending to almost as far back as the 

 testes. It is clear, therefore, that the contents of each testis ar« 

 forced outwards by muscular contraction, and each penis becomes 

 pushed outwards (everted) in consequence of the pressure of the 

 seminal fluid behind, so that what was the innermost wall of the 



