W. Nicoll 
349 
breadth is only 0 2 mm. The whole body is curved in a semi-circle, the 
dorsal surface forming the concavity. 
The dorsal lamella of the clinging-plug projects only slightly beyond 
the edge of the cup. The ventral lamella is entirely within the cup 
and its anterior edge is thickened and rolled over dorsally. The edge 
of the cup is very oblique so that its ventral lip is almost on the level 
of the ventral sucker. 
The oral sucker has a very prominent anterior lip and its diameter 
is 0'075 mm. The ventral sucker is deeply sunk, about 0 - 25 mm. from 
the head and has a diameter of 0415 mm. The pharynx, which is 
contiguous with the oral sucker, measures 0'055 x 0'04 mm. The 
oesophagus is short. 
The moderately large testes are situated close behind one another 
in the second half of the posterior portion of the body. The smaller 
ovary lies just in front of the anterior testis. The shell-gland complex 
lies between the testes. The yolk glands are voluminous, extending 
along the whole ventral surface of the posterior portion of the body and 
penetrating into the anterior portion at least as far as the level of the 
ventral sucker. They occur in the lamella of the clinging-plug as well 
as in the walls of the cup. 
The uterus is not extensive and contains only a few eggs. It forms 
a few convolutions in front of the ovary and then passes ventrally 
towards the genital papilla. The ova measure 0400-0405 x 007 mm. 
The genital papilla is of moderate size. The voluminous and highly- 
convoluted vesicula seminalis lies dorsal and posterior to the second 
testis. 
Tetracotyle tiliquae n. sp. 
In a blue-tongued lizard (Tiliqua scincoides ) a number of small, 
intensely white spots were observed beneath the peritoneum of the 
abdominal wall. They were oval in outline and measured about 
1-2 mm. in long diameter. They were found to consist of a soft cyst 
wall enclosing a mass of opaque matter, in the middle of which was a 
transparent oval cyst 04 mm. in long diameter. The wall of this inner 
cyst was about 0009 mm. in thickness. Within it was enclosed a small 
larval Holostomid. 
The parasite has the typical appearance of a Tetracotyle larva, and 
measures 0’3 mm. in length by 049 mm. in breadth. The small oral 
sucker has a single well-marked glandular pit on either side. The 
Parasitology vi 
23 
