TWO NEW MAMMALIAN CESTODES. 427 
projecting as in C. lagorchestis. There is also a slight rostellar- 
like projection at the anterior end of the scolex. he posterior 
projecting border of each proglottis is smooth and only slightly 
overlaps the following segment, and the cirrus is never found 
protruding from the pore. There are secondary longitudinal 
canals uniting the transverse excretory canals. In the posterior 
proglottis the excretory canals open into a reservoir which opens 
at the excretory pore through many canals. The testes do not 
disappear, but are found in the posterior proglottis grouped round 
the excretory pore. There is an enlargement just inside the 
cirrus-pouch filled with sperm, the vesicula seminalis, and there 
are two seminal receptacles, a smaller external and a larger 
internal sac. There is a single uterus which extends over 
excretory canals and nerves into the lateral margins, The horns 
of the pyriform body are long and filamentous. The above points 
are In marked contrast with C. lagorchestis. 
Cittotenia denticulata Rudolphi (25) was also examined at the 
British Museum (Natural History), and differs from C. lagorchestis 
chiefly in that the testes are in two groups in the lateral portion 
of the median field. The cirrus-pouch is short and does not reach 
the longitudinal nerve. There is a single uterus, and in ripe 
proglottides it extends over the longitudinal canals and nerves 
into the lateral margins. 
These contrasts suffice to show that C. lagorchestis is a distinct 
species. It has been compared in the same way with all the 
described species mentioned in the Index Catalogue (27) and in 
the Zoological Record, and the disparity has been sufficient to 
indicate that it is a new species. 
CIrroTHNIA VILLOSA, sp.n. (Pls. V. fig. 16; VI. figs. 19, 20; 
Vil—X.) 
These specimens have a leaf-like strobila and the shape re- 
sembles a large liver-fluke (fig. 16), being widest near centre and 
gradually tapering towards both extremities. The posterior 
proglottides become narrower but not longer, and thus differ 
from CO. pectinata Goeze (21), in which species they also become 
longer. The length varies from 40-80 mm. and the greatest 
width is 6 mm. The number of proglottides in strobila 
vary from 120-200. The proportion of breadth to length 
in youngest proglottides is 1:3, in older 1:8. The scolex 
stands out from the anterior end of the strobila like a truncate 
cone (fig. 21). It is 8 mm. long by 6 mm. broad. The suckers 
are large and conspicuous and set on the widest part of the head. 
They are 3 mm. broad by 4 mm. long. There is no rostellum 
or hooks. In transverse section the head appears quadrate with 
rounded corners. The suckers occupy the four corners and nearly 
meet in the median line (fig. 19). In C. lagorchestis the head 
appears circular in transverse section (fig. 4). There is no neck, 
and the proglottides commence immediately behind the head. 
In this species the posterior borders of the proglottides have 
a backwardly projecting sheath with more markedly fimbriated 
