380 
S. J. JOHNSTON. 
concave, and sometimes the posterior edge is turned forwards 
a little. The genital pore is found on the ventral surface, 
near the left side, some distance from the anterior end; the 
excretory pore is on the dorsal surface, a little in front of 
the posterior extremity. The sucker measures 0'57 mm. by 
0*63 mm. in its longitudinal and transverse axes respectively 
in the smallest specimen, and 0*717 min. by 0*782 mm. in the 
largest. Its opening is subterminal. 
Alimentary Canal. — A thick - walled oesophagus, 
0*326 mm. long, leads back from the sucker, and joins the 
intestine almost at right angles, the limbs running at first 
transversely and in the same straight line. There is no 
pharynx. The intestinal limbs extend backwards to the 
level of the excretory pore, and are provided with numerous 
side branches, both on their outer and mesial surfaces. 
Some of these lateral cmca become divided into two or three 
short branches (fig. 34). The intestinal limbs do not become 
arched in towards the median plane in the region of the 
testes, as so commonly happens in members of this family, 
but pursue a course fairly parallel to the sides of the body, 
converging a little at their posterior ends. 
Excretory System. — The excretory vesicle is provided 
with the characteristic funnel-shaped end, bearing processes 
on its walls — the ^Afippen^^ of Looss ( 33 ) — as in Epibathra 
and other related genera. The capacious vesicle extends 
forwards as far as the ovary, and is produced on each side 
into three or four wide diverticula. From one of these pairs 
— the second from the front — the main vessels are given off 
and extend outwards till they reach the outer sides of the 
testes. Here each vessel divides into two branches, one 
running posteriorly, the other anteriorly (fig. 10). Each 
anterior branch pursues an undulating course, in seven or 
eight large waves, ending blindly near the sucker. Branches 
are given off both from the outer and inner aspects ; the 
former end blindly, but the latter anastomose with one 
another in the space between the intestinal limbs, ventral to 
the uterus. 
