512 Mr. H. A. Baylis on 
ITymenolepis sp. 
Some fragments of the strobila of a Hymenolepis also 
occurred in one of the eider-ducks (Somateria mollissima) at 
Yukanski, together with an Aploparaksis to be described 
below; but the absence of a scolex makes determination 
difficult or impossible. 
Aploparaksis filum (Goeze), Clerc, 1902. 
A headless fragment, perhaps referable to this species, was 
taken from a purple sandpiper (Z'rénga maritima) at Yu- 
kanski, 5. vi. 1917. 
Fig. 8. 
Aploparaksis murmanica, 
A. The scolex, with extended rostellum. 
B. Hook from the rostellum, much more highly magnified. 
Aploparaksis murmanica, sp.n. (Fig. 8.) 
Host: Somateria mollissima. Yukanski, 8. vi. 1917; 
Petschenga, 24. ix. 1917. 
This is a very small and delicate species, which was 
