0. L. Boulenger 
423 
from the oesophageal funnel. Six head-papillae. The anterior leaf- 
crown consists of numerous leaf-like elements springing from the internal 
surface of the well-developed mouth-collar; the posterior leaf-crown is 
represented by a ring of low septa-like projections, corresponding in 
number and distribution to the leases of the anterior crown. The dorsal 
gutter of the oesophageal gland is well developed and terminates at the 
anterior border of the mouth capsule. The bursa of the male has a 
finely denticulated border, the median lobe is prominent. A dermal 
collar partly or completely surrounds the genital cone and the prebursal 
papillae are greatly elongated. The spicules are long and terminate in 
small hooks. The female opening is in the posterior region of the body. 
Triodontophorus intermedius Sweet 1909. 
As mentioned above this species was described by Sweet in 1909 
from three female specimens preserved in the Biological Museum of 
the University of Melbourne. The types were from Horsham, Victoria, 
and were labelled “Horse: stomach (and intestines?)”, probably in 
error, as from our knowledge of allied species it seems almost certain 
that they can only have been obtained from some part- of the large 
intestine. 
Whilst commenting on the fact that this species in some respects 
combines the characters of T. serratus and T. minor, Sweet remarks 
“one is tempted at first sight from some of the linear proportions to 
regard it as an immature form of T. serratus, but that is seen to be out 
of the question on examination of the reproductive organs, which are 
fully mature.” 
Among my material from the Redditch district of Worcestershire 
were a number of worms v r hich I, also, originally took to be specimens 
of T. serratus ; more careful examination of these showed that I was 
dealing with a species, quite distinct from that described by Looss, 
but agreeing very well with the Australian form, at least as far as the 
females were concerned. As both sexes were abundantly represented 
I am able to add considerably to Sweet’s diagnosis. 
Specific diagnosis. Triodontophorus: cuticle of the whole body 
transversely ringed in a similar manner to Looss’ type species. The 
head is not sharply marked off from the rest of the body, its diameter 
is 200-260/x. The mouth-collar is high, not depressed near the outer 
margin as in T. serratus and T. minor, on the contrary it appears 
approximately circular when seen in profile (Text-fig. 2 A). The external 
