Entozea from the Murman Coast. 505 
course towards the middle of the segment. ‘he testes are 
very numerous (about one hundred), extending thronghout the 
medullary parenchyme on either side of the female glands. 
The ovary, consists of two symmetrical bunches of lobes 
situated in the middle of the segment. ‘The yolk-gland is 
situated at the back of the segment. he shell-gland is a 
conspicuous organ lying between the ovary and the yolk- 
gland. The vagina runs fairly straight from the genital 
pore to the middle of the segment, its inner end, functioning 
as a receptaculum seminis, persisting in the gravid segments 
after most of the other organs have disappeared. The oviduct 
becomes very wide before opening into the uterus, running 
vertically for the last portion. The uterus appears at first as 
a transverse tube, but afterwards disappears, and numerous 
egg-capsules are formed. 
The most important character distinguishing this forna 
from the typical J). tetragona is the much larger number of 
testes (twenty to thirty in D. tetragona, about one hundred 
in the present variety). 
Dilepinidez. 
Lateriporus teres (Krabbe), Fulrmann, 1907. 
Host: Somateria mollissima. Yukanski, 8. vi. 1917; Pet- 
schenga, 24. ix. 1917. 
This species seems to be fairly common in the eider-ducks 
in this region. It was met with in two individuals obtained 
at the first-given locality, and in another at the second. 
Choanotenia paradoxa (Rud.), Clerc, 1903. 
A single specimen, probably referable to this species, was 
obtained from a red-necked phalarope (Phalaropus lobatus) 
at Yukanski, 10. viii, 1917. 
Choanotcenia sp. (?). 
(Not Ch. borealis (vy. Linst., 1905}, Fuhrmann, 1908.) 
Host: Clangula hyemalis [= Harelda glacialis] (long- 
tailed duck). Yukanski, 8. vi. 1917 and 10. vi. 1917. 
There are several fragments of what appears to be a species 
of Choanotenia, or possibly Anomotenia, obtained on 
different occasions from two long-tailed ducks. Unfortu- 
nately, however, there is only one scolex, and this has lost its 
rostellum, so that the characters of the hooks, so important 
