W. Nicoll 
337 
sides of the body from the posterior border of the ventral sucker to 
almost the tip of the tail. They completely envelope the intestinal 
diverticula but do not overlap the testes and do not unite in the post- 
testicular space. The uterus is not very voluminous and contains only 
about 70 eggs. They are of large size measuring 0 091-0 105 x 0054- 
0'073 mm., the average being 0098 x 0059 mm. 
Eehinostoma australasianum n. sp. 
(Plate XXIII, fig. 2.) 
'Four specimens of this species were obtained from the intestine 
of the native companion (Antigone australasiana). It differs very 
considerably from the foregoing species chiefly in the shape of the 
ventral sucker and in the position of the genital glands. It is decidedly 
larger, measuring 13-14 mm. in length. The maximum breadth across 
the ventral sucker is 1*75 mm. The head is bent towards the ventral 
surface and there is a pronounced cervical concavity. The neck expands 
abruptly in front of the ventral sucker and the body thereafter narrows 
gradually towards the tail. Spines are present on the anterior part of 
the body as far back as the posterior border of the ventral sucker. 
The head has a breadth of 1 mm. and on it are 45 cephalic spines 
arranged in two unbroken rows. They have the usual disposition and 
shape, and measure 0T1-0T35 mm. in length. The spines of the 
anterior row are somewhat longer than those of the posterior row. 
The oral sucker is comparatively large, measuring 0'38-0‘41 mm. in 
diameter. There is practically no prepharynx but the pharynx is of 
large size and measures 0‘35 x 0'2 mm. The oesophagus extends back¬ 
wards to a little in front of the ventral sucker where the bifurcation 
takes place. The diverticula extend to near the tip of the tail. The 
ventral sucker is decidedly funnel-shaped. Its diameter is IT mm. but 
its depth is almost twice as great, namely 21 mm. The centre of the 
aperture is about 21 mm. from the anterior end of the body. 
The genital aperture is median just behind the intestinal bifurcation. 
The cirrus-pouch is short and plump and does not quite reach the 
middle of the ventral sucker. It contains a large convoluted vesicula, 
a short prostate and a moderately large ductus and cirrus. The vagina 
is very muscular and extends beyond the posterior border of the ventral 
sucker. 
The anterior testis is situated almost exactly in the middle of the 
body. The second testis is a very short distance behind it and the 
