54 
The Genus Fasciola 
the diverticula of the alimentary canal are as in F. hepatica, the internal 
branches, however, are numerous and always ramose to a greater or less 
extent. The yolk glands are present on both sides of the alimentary canal. 
The testis area is shorter in relation to the rest of the body than in F. hepatica. 
The eggs are larger than those of F. hepatica , varying from 0-125 mm. to 
0-175 mm. in length to 0-060 mm. to 0-100 mm. in breadth. 
Habitat. Liver of ruminants. 
Looss’ observation that in this species we have to do with an African 
liver fluke in the same way as F. magna may be called an American fluke, 
must be looked upon with caution, until it is known whether the Rangoon 
specimens indicate a wider distribution than he had reason for suspecting. 
FASCIOLA NYANZI (LEIPER) (PI. Ill, figs. 3 and 4). 
This fine species was found by Leiper in the bile ducts of the liver of a 
hippopotamus taken in Uganda and described by him under the above name 
(1910). His specimens were somewhat macerated and he was therefore unable 
to describe the species in every particular. Among the material from Nairobi 
(tube No. 65) I fortunately found a number of well preserved specimens of 
this species and I am able to add to Leiper’s original description. 
None of the specimens were as large as the largest described by Leiper, 
the longest being 59 mm. by 9 mm., the broadest 13-5 mm. by 49 mm. and 
the smallest specimen 35 mm. by 4-5 mm., but the remarkable general form 
was unmistakably as he described it. The species is especially noticeable for 
the great breadth of the “shoulders,” the large cone and the long tapering 
body, almost entirely occupied by yolk glands. 
The worm is thickly covered with spines, of a moderate size on the body 
and smaller and more closely set on the cone. The oesophagus is exceedingly 
short and the paired diverticula of the gut approximate behind the level of 
the shell gland and for the rest of their course lie very close together. The 
internal branches of the diverticula are fairly numerous, but small and in¬ 
frequently branched. Branches from opposite sides frequently pass across 
one another or lie close together, giving a superficial appearance of anasto¬ 
mosis. The testes are confined to the anterior third only of the body. The 
ovary lies on the right hand side of the animal and is a typical branched body. 
The uterus is short and its coils are close behind the ventral sucker. Laurer’s 
canal is present; it is very small and in the specimens examined had no 
contents. The yolk glands extend rather further forward into the “shoulders” 
in my specimens than in Leiper’s, and lie exclusively (except for a stray 
branch or two) on the ventral side of the gut. It shares this interesting feature 
with F. magna in the genus Fasciola. The point is particularly easy to 
make out in the cleared specimens; viewed from the dorsal surface the 
alimentary canal is sharply outlined against a background of yolk glands. 
The excretory and nervous systems are as in F. hepatica. 
The eggs vary considerably in size in different specimens, and the size 
