A NEW MAMMALIAN CESTODE. 1041 
These are the only external characters to be noticed in this 
worm, whose identity or systematic position, as is obvious, could 
not be thereby determined. The flatness and thinness of the 
strobila is emphasised by transverse sections. In such, the fact 
may be observed that the cortex is of less diameter than the 
medulla. As is usual, the two layers of parenchyma are separated 
by a layer of transverse muscles, which is, in the present species, 
Text-figure 2. 
Monecocestus erethizontis. 
Part of a transverse section through a ripe proglottid. 
ci. Cirrus-sac. ov. Ovary. 7.s. Receptaculum seminis. w¢. Uterus. 
w.v. Water-vascular vessels. 
a thin one. So, too, are the longitudinal muscles, which are no- 
-where massed into bundles. They lie singly, but in several rows ; 
nor is their arrangement regular. Thus the muscular system is 
altogether slight, and contrasts in this with various members of 
the family Acoleide. The muscular fibres themselves are slender, 
Proc. Zoou. Soc.—1914, No. LXX. 70 
