TWO NEW MAMMALIAN CESTODES. 499 
the inner border of the receptaculum seminis. ‘The vas deferens 
is coiled, and loops first towards the median field and then dorsally 
back towards the margin. A large part of the vas deferens is 
swollen to form an elongate vesicula seminalis as in C. zschokket 
von Janicki (10). The vas deferens passes obliquely downwards 
to the cirrus-sac. The cirrus-pouch is even more elongate than 
in (. lagorchestis, 1:4 mm. long but not quite so broad. It is 
possessed of the saine musculature on its wall as in C. lagorchestis, 
and the cirrus is also thick-walled with a muscular wall, a narrow. 
lumen, and is covered with numerous bristles. Also, between the 
wall of the cirrus-sac and the cirrus is a mass of spongy tissue. 
In a few cases the cirri are seen protruding from the male genital 
pore (fig. 26), but in most cases cirrus and cirrus-sac are retracted 
from the margin and the muscular sphincter is retracted into the 
sub-cuticular parenchyma, and a wavy duct with wrinkled walls 
passes to the exterior to open at the anterior border of the lateral 
margin (figs. 23 & 24). 
Female Reproductive Organs. 
There is a large receptaculum seminis as in C. lagorchestis, 
and lying dorsal and to the innerside of this are a number of 
tubules, arranged fan-wise, which collect into a circular sac, 
alongside of which, nearer the median field, is a small bean- 
shaped vitelline gland. The duct from the receptaculum seminis 
enters the circular sac of the ovary. The oviduct passes out 
dorsally, and passes through the shell-gland near its origin from 
the ovary and enters the uterus dorsal to the ovarian tubules. 
The vagina is a thick-walled duct much as in C. lagorchestis, 
but is not abortive. It does not open into a genital atrium 
but opens separately in the middle of the projecting lateral 
margin of the segment (figs. 23 & 24). The uterus arises as a 
single transverse duct and has proximal and distal diverticula. It 
passes above the female genitalia on each side to run out over 
the longitudinal canals into the lateral margins as in C. pectinata 
Goeze (fig. 27). The egg has a pyriform apparatus, the horns of 
which are filamentous and cross one another (fig. 29). 
The characters which show that this species is in distinct 
contrast to other species are :— 
(1) The extraordinary development of the fimbriations of the 
projecting sheath at the posterior border of each proglottis (fig. 16). 
(2) The presence of two large testicular sacs instead of, as 
in other species, numerous small testicular sacs (figs. 30 & 31). 
(3) The absence of reproductive organs entirely in some 
strobile (fig. 16). 
4) The absence of reproductive organs in the earlier pro- 
glottides (fig. 25). 
(5) The male reproductive opening situated at the anterior 
edge of the projecting lateral margin and the female reproductive 
opening in centre of margin (figs. 23 & 24). 
