W. Nicoll 
The oral sucker measures 0'63-0'74 mm. with an average of 0'69 mm. 
in the five specimens measured. The ventral sucker has a diameter of 
0’44-0’55 mm., average 0'50 mm. In all the specimens the oral sucker 
exceeded the maximum limit assigned to it by Looss, but the ventral 
sucker corresponded more closely in size to the figures given by him. 
The sucker ratio is on an average approximately 7 : 5 or T38 :1, which 
approaches sufficiently near the ratio 16:12 given by Looss. In one of 
my specimens, however, the sucker ratio was nearly 18 :12. 
In the second lot of specimens the length was 11-15 mm. and the 
breadth 2 - 7-4 mm. They were not so carefully preserved as the 
previous lot and many of them were much distorted. 
They were all quite mature. The oral sucker measured 053-067 mm. 
and the ventral 0'45-0'52 mm., the average being O’GO mm. and 0'48 mm. 
and the ratio 5:4. The dimensions in this lot evidently correspond 
more closely to those given by Looss for Clonorchis sinensis than do 
those of the previous lot. It is quite possible that the latter were 
flattened by pressure which might account to some extent for the in¬ 
creased dimensions. In any case, however, it is certain that the oral 
sucker may occasionally be somewhat larger than the maximum quoted 
by Looss, and on the other hand that fully mature specimens may be 
found as small as 11 mm. 
The mounted specimen corresponds more nearly to Clonorchis 
endemicus (Baelz). It is 15 mm. in length and has suckers measuring 
0 - 46 mm. and 0'39 mm. respectively. This specimen cannot be ascribed 
to C. sinensis unless it be admitted that the minimum limit (0'52 mm.) 
given by Looss, for the oral sucker, is too high. 
It is unfortunate that the specimens at my disposal were not more 
numerous so that I might have been able to pass some opinion on the 
question of the identity of the two species of Clonorchis. 
Family FASCIOLIDAE. 
Sub-family Fasciolopsinae. 
Genus Fasciolopsis Looss. 
Fasciolopsis buski (Lank.). 
A single specimen of this parasite was presented to the Institute by 
Dr C. L. Strangman, Port Darwin, but there are no particulars with 
regard to its origin. 
o o 
