W. Nicoll 
33 
The specimen, which was slightly pressed, measures 2-18 mm. in 
length with a maximum breadth of 0-73 mm. in the posterior part of 
the body. The body narrows rapidly in front of the ventral sucker so 
that the head appears pointed. The ecsoma (appendix) is retracted and 
does not appear to exceed 0-6 mm. in length. 
The oral sucker has a diameter of 0-16 mm. and it has no anterior 
lappet. The larger globular ventral sucker measures 0-43 mm. and lies 
0-64 mm. from the anterior end. 
The globular pharynx measures 0-075 mm. and there is neither 
prepharynx nor oesophagus. The diverticula are wide and reach the 
posterior end of the soma. 
The testes lie immediately behind the ventral sucker, almost 
symmetrically, the left testis being a little in advance. They are widely 
separated and their maximum diameter is 0-11 mm. 
The ovary is situated 0-4 mm. behind the ventral sucker. It is 
transversely oval, measuring 0-15 x 0-28 mm. Immediately behind it 
lie the small yolk glands, with short stumpy digitations, four on the 
left and three on the right. 
The vesicula seminahs extends from the anterior border of the 
ventral sucker to the intestinal bifurcation. The pars prostatica is 
short and the prostatic cells few. There is, however, a large prostatic 
bulb. The short “cirrus-pouch” lies over the pharynx. 
The uterus fills the post-acetabular region and there is a long straight 
metraterm. The numerous ova measure 0-020-0-021 x 0-012 mm. 
Genus Ectenurus Looss. 
Ectenurus angusticauda n. sp. 
(Plate IV, fig. 7.) 
A single specimen of this parasite was taken from the stomach of 
an eel {Muraenesox cinereus). It is of medium size, the body being 
3-1 mm. long and the appendix (ecsoma) extended a distance of T15 mm. 
The latter is characterised by its slenderness. 
The body, which is almost cyhndrical, is broadest in its posterior 
half, attaining a maximum breadth of 0-9 mm. Forward it tapers 
gradually to the anterior end. The cuticle is not markedly annulated, 
there being only traces of transverse wrinkles present. 
The oral sucker has a diameter of 0-22 mm. and the ventral 0-44 mm. 
The latter is situated 0-88 mm. from the anterior end. 
Parasitology vrtx 
3 
