230 Records of the Indian Museum. [VoL. XVIII, 
the oral sucker. The coeca are long reaching to the distal quarter 
of the body length. Near the junction of the coeca there is a 
cluster of cells which have the appearance of glands, but no 
ducts leading to the oral sucker were detected in the preserved 
material. Close to the tail a small bladder can sometimes be 
observed with traces of a pair of ducts directed anteriorly and 
one running posteriorly down the middle of the tail. 
The most characteristic feature of the anatomy is, however, 
the partially developed gonad which lies immediately above 
the acetabulum. ‘The gonad is very conspicuous in stained 
preparations and in dorsal or ventral view appears T-shaped with a 
fine strand joining each cross-piece to the stem. In reality the 
structure is more complex than this view indicates. The principal 
portion consists of a rod, about twice as long as the diameter 
VExT-FIG. 1.—Cercariae from Seistan. 
a-c. Cercaria A. d-e. Cercaria B. 
Feo CercanianGs \ 
of the acetabulum, which is dilated anteriorly and in its posterior 
third At its hinder end a transverse portion, consisting of a 
slender shaft and swollen head, joins it on either side and each of 
these portions curves downwards, so that the head itself is on 
a much lower level than the central rod from which it arises 
(fig. tc). From the head of each transverse portion a fine strand 
runs forward ; the two unite and the single strand so formed meets 
the dilated anterior part of the main axis on its ventral side. The 
disposition of the parts, as seen obliquely from the side, is indicat- 
ed in text-fig. tc. Thestructure is remarkably constant in form, 
showing little variations in fully grown and well preserved 
individuals. 
__ The space between the gut and the body-wall is filled 
with large cells which lie with their long axes placed transversely. 
