ON SOMP] QUEENSLAND TREMATODES. 
877 
species^ as the oral sucker. Benedeu_, for instance (2), 
calls itthe^bnlbe buccale — terms he applies to the oral 
sucker in other rnalacocotyleans described by him. He noticed 
the funnel-shaped depression in the anterior end of the body 
leading down to this ^H)ulbe buccale/^ and his fig. 4^ pi. xii, 
in the work quoted corresponds closely to the condition of 
a ff ai rs in T . r e t i c u 1 a r e and A . a n t i g o n e s . The wal Is of 
this funnel-shaped depression, in the specimens examined by 
me, are provided with muscular fibres, especially at its base 
(fig. 31), and I am convinced that here we have to do with 
the real oral sucker, very poorly developed though it be. 
Monticelli ( 40 ) has called it a pras-pharyux, and Kossack 
( 18 ) a pr^-pharynx (p. 501) and a mouth-cavity ('^ mundhohle,’'’ 
p. 543). The pharynx is a typical malacocotylean pharynx 
not only in regard to its position and shape, the structure of 
its muscular walls and of its lining, but also in its relation to the 
nervous system, the two cerebral ganglia lying completely in 
front of it (fig. 29). This structure both Monticelli and 
Kossack recognise as the pharynx. The walls of both the 
oral sucker and the oesophagus are richly supplied with gland- 
cells. 
In A. antigonis the pharynx measures O’-ll mm. long by 
0’25 mm. wide, the oesophagus, 0’244 mm. long, the anterior 
testis, which is round, being 0'733 mm. in diameter, the 
posterior, which is oval and transversely placed, being 
T059 mm. long by 0*896 mm. broad. In outline the testes 
are slightly indented. The ovary, which is oval and smooth- 
edged, measures 0*407 by 0*326 mm. 
The ventral network of excretory vessels present in T. 
reticulare and A. antigones probably also occurs in 
other related forms. Van Beneden ( 2 , p. 72) speaks of an 
anastomosis near the anterior end between the two main 
trunks in Monostomum mutabile, and shows it in his 
figure (2, fig. 3), but obviously overlooked the ventral net- 
work through the want of a good series of sections. 
In A. antigones the network is more richly developed, 
and there is a dorsal as well as a ventral network. The form 
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