382 
S. J. JOHNSTON. 
ejaculatory duct and penis by a shallow constriction. The 
vagina, which is surrounded near its termination by a mass 
of unicellular glands, is only about half as long as the cirrus 
sac. 
The ovary is deeply lobed, about as large as one of the 
pieces of testis. It lies to the right of the middle line on a 
level with the anterior end of the testis. A larg-e shell- 
gland lies to the side and somewhat behind it, in the middle 
line. Laurer’s canal is present but there is no receptaculum 
seminis. The transverse yolk-ducts meet to form a small 
yolk reservoir on the dorsal surface of the shell-gland.” 
The small rounded follicles of the yolk-glands are massed in 
grape-like bunches, there being from eight to twelve of these 
bunches on either side. They lie on the ventral side of the 
intestine and extend from the testes behind to a level a little 
in front of the middle of the body. The coils of the uterus 
are confined to the space between the intestinal limbs. 
The eggs measure 0*033 mm. long by 0*019 mm. broad. 
Those in the proximal part of the uterus have no filaments, 
but the older eg;gs in the more distals coils appear to possess 
a single fairly large filament at the narrow end attached to 
the operculum, and a bunch of fine filaments at the other end. 
In the sections a few of these eggs exhibited this character 
clearly, but in the majority of cases the filaments appear to 
have become separated and lie in the uterus amongst the eggs, 
in masses. 
Diagnosis. — Body above middle size, skiff-like. Collar 
less conspicuous than in the other genera of this family, 
taking the form of a low swelling round the head. Intestinal 
limbs extending straight backwards as far as the excretory 
pore; not arched inwards towards the middle line in the 
region of the testes; richly provided with side branches 
throughout their whole length both on their inner and 
outer aspects. The excretory vesicle reaches the shell- 
gland ” in front, with wide lateral diverticula; the main 
branches running up to the head end in an undulating course, 
giving off branches, s o m e o f w h i c h anastomose. Genital 
