TWO NEW SPECIES OF CESTODES. 275 
the anterior, but not up to the posterior, margin of the segment. 
In fact, they completely underlie the ovary, but not always 
completely the vitelline gland. In the earliest proglottids which 
show a uterus, the latter lies only anteriorly and, of course, 
ventrally. The uterus in the first two or three segments in 
which it is found consists merely of a transverse tube anteriorly 
and ventrally, the two ends of which are dilated into two or 
three more or less oval diverticula, which are thus quite lateral 
in position. It seems, in fact, to resemble closely the uterus of 
Oochoristica rostellata, as represented in Zschokke’s figure *. 
Text-figure 5, 
ut, ue, 
Part of a horizontal section through three consecutive segments of Oochoristica 
marmose, to show the extension of the uterus lateral] y- 
1. Longitudinal muscles. m. Nerve-cord. wt. Uterus. 
In later proglottids (text-fig. 5) the uterine cavities range 
through the medulla much more extensively, and also penetrate 
into the cortical layer. Finally, the cavities of the uterus are 
obliterated by growths of the parenchyma, and the individual eggs 
(or rather embryos) come to lie singly, filling up the entire interior 
of the proglottid. The development of the uterus, in fact, seems 
* Zeitschr. wiss. Zool. Bd. Ixxxiii. 1905, Taf. i. fig. 2, v. 
Proc. Zoot. Soc.—1914, No. XIX. 19 
