278 DR. F. E. BEDDARD ON 
upon as the remains of the uterine cavity. Those who have 
figured the embryo of Oochoristica have, as a rule, not repre- 
sented this stage, which, however, is not the case with Lihe™*, 
who has represented such embryos in “ Tenia” megastoma Dies. 
The first membrane to be formed is a fine one immediately 
surrounding the embryo. Later on a much thicker and deeply 
staining outer membrane is formed, which lines the “ capsule” 
of the parenchyma in which the embryo lies. Between these 
two there is no third membrane. There is thus an important 
difference between the present species and Linstowia ameivee (cf. 
text-figs. 3, 8), also described in the present communication to 
the Society. In Oochoristica marmose (text-fig. 8) the eggs 
Text-figure 8. 
A later stage than that represented in text-fig. 7. 
A. Outer membrane. C. Embryo surrounded by thin inner membrane. 
have therefore a much clearer appearance, owing to the larger 
empty space which separates the embryo from the outermost 
membrane. As to this latter membrane, it is apt to be 
hexagonal in transverse section, owing to its separation from 
the embryo and close adherence to the parenchymal walls; and 
it is not unreasonable to think that it may be a product of the 
parenchyma rather than of the embryonic cells. This appears 
to be the opinion of Zschokke 7 with regard to the uterine 
ova of Linstowia semoni, for he writes: ‘“* Die ganze Markschicht 
ist .....vollstiindig angefillt von derbwandigen, rundlichen 
Bindegewebskapseln, die sich gegenseitig einengen. Jede 
* Arch. f. Natutg. 1895, pl. x1. fig. 15. 
+ “Die Cestoden der Marsupialia, etc.,” in Semon’s Zool. Forschungsreise, etc., 
Jan. 1898, p. 368. 
