TWO NEW MAMMALIAN CESTODES. 421 
The strobile are uniform in breadth save at the anterior and 
posterior extremities, where they become narrower. The scolex 
is ‘6 mm. long by ‘75 mm. broad. The proportion of breadth to 
length in young segments is as | to 3, in older as 1 to 6. 
The scolex is rounded with no rostellum and no hooks. It is set 
on the top of the strobila lke a dome-shaped knob. There are 
four oval suckers. Each of the four is °35 mim. long by °25 mm. 
broad. There is no neck, and the proglottides commence imme- 
diately behind the head (figs. 2&3); each of them possesses a well- 
marked projection at its hinder border which overlaps half of 
the succeeding proglottis. The edges of these projections are 
fimbriated, showing an even serration which gives the animal an 
ornamented appearance resembling the condition found in Thysa- 
nosoma fimbriata Dies. (22). The genital pores are found in the 
middle of the projecting lateral margins of the segment. The cirri 
are often seen projecting from the pores (figs. 12 i: 14). The mus- 
culature does not present any marked peculiarities. It is lke 
the structure described for (ittotenia zschokkei von Janicki (10), 
where the musculature forms numerous fine-threaded bundles. 
The subcuticular layer consists of well-developed longitudinal 
and transverse muscular layers. There is also a system of 
sagittal fibres which run dorso-ventrally, forming a dense network 
of fibres between the transverse plates. They branch greatly 
and these branches form a network around the testes and various 
female glands. There is a ventral and a dorsal longitudinal 
excretory canal on each side. The ventral canal is large, thin- 
walled, and seldom circular in cross-section. The dorsal canal is 
smaller and circular. It has a thick cuticular lining around 
which is a layer of muscle-fibres. All the canals unite in the 
head, forming an anterior loop between the suckers. The ventral 
canals are connected in the posterior portion of each proglottis 
by a transverse canal. There are no secondary longitudinal 
canals connecting the transverse canal as described for C. pectinata 
Goeze. The excretory system so far resembles that in C. varia- 
bilis Stiles (21). On the terminal segment the canals open by a 
simple pore situated towards the anterior end of the proglottis 
(fig. 15). The large ventral canal discharges by simple trans- 
verse tubes into this pore. There is no reservoir as described 
for CO. pectinata Goeze (21), nor is there a projection of the 
parenchyma into the ventral canal at the posterior end of each 
segment, as described by Fuhrmann in C. kuvaria Shipley (7). 
The first rudiments of the genital organs appear in the pro- 
glottides immediately behind the head (fig. 3). There are two 
sets of genital glands in each segment (fig. 7), and two 
uteri in the early segments up to the 80th segment, where they 
meet in the median field, and it appears ag if there were only 
one uterus (fig. 1). The uteri possess proximal and distal diver- 
ticula. Very young segments in which the reproductive organs 
are in their first rudiments, show the vagina running out to 
open into the genital atrium posterior to the cirrus (figs. 5 & 6). 
28* 
