W. Nicoll 
89 
very characteristic feature of the species is the course pursued by the 
yolk ducts. They run down from the posterior end of the yolk glands 
on each side and pass round the outer edges of the testes. They then 
run forward and unite between the testes. 
The uterus contains very few ova, which lie mostly over and in 
front of the ovary. They are hght yellow in colour and measure 
0-078-0-084 X 0-045-0-049 mm. 
This parasite presents many interesting peculiarities. It appears 
undoubtedly to belong to the Amphistomata and to the family Param- 
PHiSTOMiDAB, but it is difficult to include it in any of the subdivisions 
of that family. It can certainly not be included in the Paramphisto- 
minae owing to the presence of a cirrus-pouch. It bears more general 
resemblance to some of the members of the Cladorchiinae, but the 
absence of oral evaginations (pharyngeal pouches), which are apparently 
constantly present in members of this sub-family, renders it at once 
an aberrant form. It is probably most closely related to the genus 
Pseudocladorchis Daday from South American fishes, but the relation 
is a decidedly remote one. 
Genus Bucephalopsis Diesing. 
Bucephalopsis exilis n. sp. 
(Plate V, fig. 11.) 
Four rather macerated specimens of this parasite were obtained 
from the intestine of Camnx nobilis, and they appear to be distinctly 
different from any of the already described Gasterostomes from Europe 
and America. The species bears a certain resemblance to Bucephalopsis 
arcuatus Linton (1905) from Scomheromorus regalis. 
It is a greatly elongated form, measuring 1-9-2-6 mm. in length. 
The maximum breadth is only about one-twelfth of the length. The 
cuticle is covered, throughout the greater part of its extent, by minute 
spines which become rather sparse towards the posterior end of the 
body. 
The anterior end is furnished with a well-formed sucker, 0-05 mm. 
in diameter. The pharynx (ventral sucker) is a small inconspicuous 
structure, difficult to detect. It lies a third of the body length from 
the posterior end and measures 0-04 mm. in diameter. The intestinal 
sac is obscured by the uterus. 
Alongside the pharynx lies the ovary. It is an oval body measuring 
0-1 X 0-07 mm. and its long diameter may be either longitudinal or 
