PROTEOCEPHALUS GALLARM. 
mid-region of the medulla. The vas is dorsal to the vagina, which 
passes under it on its way inwards and backwards from the female 
pore to the ovary. Just before entering the cirrus sac the coils 
become less numerous, and the vas now passes below the vagina 
as a narrow tube. Within the sac it becomes considerably coiled 
and widened again to act as a vesicula seminalis, the coils lying 
in the inner half of the sac. The eversible portion or cirrus lies 
introverted within the outer half of the sac, and possesses power- 
ful longitudinal and circular muscles in its wall. The cirrus sac 
is an elliptical structure with rather weak muscular walls. The 
whole organ closely resembles that of P. coryphicepha la (Mori tic.).* 
As already mentioned, the sac lies ventrally to the nerve and the 
vitelline glands. It also usually lies ventralty and parallel to the 
vagina. The cirrus was seen in a state of eversion only in a. few 
transverse sections, where it appeared as a projection 0.086 mm. 
long by 0.020 mm. wide. No armature was recognised. 
The female glands possess the general characters present in 
other members of the genus. The ovary is a wide bilobsd organ 
of 0.5 mm. in breath, situated at the posterior end of the segment 
and extending from the excretory vessels of the one side to those 
of the other. Each wing is only slightly divided up into ovarian 
tubes. There is a very narrow bridge connecting the lateral por- 
tions, each lobe being situated dorso-laterally in the medulla while 
the bridge lies quite ventrally, just above the ventral inner longi- 
tudinal muscle series. From the middle of the bridge there passes 
backwards a narrow slightly coiled oviduct which eventually enters 
the fertilising duct just after the latter penetrates the shell-gland. 
There is a well-marked swallowing apparatus present on the com- 
mencement of the oviduct just behind the ovarian bridge. The 
oviduct forms a loop, passing forwards and somewhat dorsally to 
meet the fertilising duct just behind the middle of the ovary. This 
duct then passes on dorsally to penetrate the shell-gland complex, 
which lies just behind and dorsally to the ovarian bridge. 
The vitellarium consists of a great number of tiny follicles 
averaging 0.C20 mm., and arranged in a longitudinal row in the 
cortex along each side of the segment, just externally to the main 
longitudinal musculature and immediately above the nerves. The 
* Monticelli, Boll. Soc. Nat. Napoli. Ser. 1, 1891, v, p. 161, etc., and fi- 
