364 
S. J. JOHNSTON. 
intestinal limbs. Coils of the uterus running transversely, 
very numerous and close together, extending outwards a 
little beyond the intestinal limbs. Eggs small, operculated, 
with a long filament at each end. 
Host : Hal i core du gong, in the intestine. 
Type-specimen in the Museum of the Australian Institute 
of Tropical Medicine, Townsville, No. T. 33. Co-type in the 
Australian Museum, No. W. 363. 
These worms are large in size, up to 22 mm. long by 5 mm. 
broad. In shape they are elongated and lancet-like, gradually 
tapering to a rounded point in front, broader and more bluntly 
rounded ofi behind. While the body is comparatively thin 
anteriorly, it becomes very thick at the posterior end, where 
the gonads and the peculiar digitate organ lie. The dorsal 
surface is convex; the ventral flat or slightly concave in 
front, but more deeply .concave in the posterior region, where 
the lateral and posterior edges of the body are turned in 
venti-ally. 
The ventral surface of the body is covered by a dense mat 
of hooks, the bases of the thick shafts of which form a 
tessellated pattern all over it. Each hook, sickle-shaped in 
longitudinal section, consists of a stout shaft and a backwardly 
directed bifid point, turned almost at right-angles to the shaft. 
They are 0’107 mm. long and 0’064 mm. broad at the base. 
These hooks are set in a very thick cuticular layer (figs. 15 
and 16), which is apt to peel off in large patches or to come 
ofi bodily from the whole surface. This may happen, not 
only in the case of specimens fixed in hot sublimate acetic, 
but also in those specimens fixed in hot 70 per cent, alcohol. 
The majority of the specimens, however, preserved this layer 
intact. 
The sucker, almost circular in form, measures 0’733 min. in 
diameter in specimens 22 mm. long — i. e. is almost one- 
thirtieth the body-length. It is subterminal and directed 
ventrally. There is no pharynx, but the oesophagus, which is 
moderately long and stout-walled, leads directly out of the 
oral sucker. The intestinal limbs are very thin-walled. They 
