A NEW MAMMALIAN CESTODE, 1051 
resembles Bertia (now written Bertiella) americana, a species de- 
scribed by Stiles * from the same genus Hrethizon, and previously 
assigned by the American helminthologist to the genus Andrya. 
This species, which is possibly, according to Stiles, identical 
with Tenia laticephala of Leidy*t, is regarded by v. Janickit 
to be identical with his Schizotenia. 
Text-figure 8. 
Monceecocestus erethizontis. 
Transverse section showing the retiform uterus (wt.). 
ci. Cirrus-sac. w.v. Water-vascular tube. 
At first sight of the figures given by Stiles in explanation of 
this species, I was disposed to think that it might be identical 
with that which I describe in the present paper. For example, 
the male pores alternate with absolute regularity from right to 
left in segment to segment, and the very early development of 
* Proc. U.S. Nat. Mus. xix. 1897, p. 165. 
+ Proc. Ac. Sci. Philad. 1855, p. 443. 
t Zool. Anz. xxvii. 1904, p. 782. 
