T 47 
nor is it sufficient to-day to give of new forms of parasites a superficial 
account of some general characters, if such descriptions are to be of 
real scientific value. It would not be a difficult thing to enumerate 
dozens of modern papers of this sort ; they look and read quite nicely, 
but nothing would have been lost had they never been published at 
all. I will not mention any names, nor is it my intention to blame or 
to offend those who do not share my scientific convictions, but 1 desire 
to convince them, in the interest of our particular branch of science, 
that by this time certain views considered as almost axioms b) our 
predecessors can no longer be upheld. 
The question as to the denomination of the two species of 
0 pisthorchis sinensis in accordance with the modern rules of scientific 
nomenclature is easy to decide. There is no doubt that the large form 
is the same as originally found and described by McCONNEI.L ; it 
must therefore retain the specific name sinensis COBBOLD. The 
smaller species is, unmistakeably again, the same as first recognised 
by Baelz and distinguished under the designation Distowa 
endemicum ; I therefore re-establish this specific name for it. Both 
species are members of a natural genus which might have been created 
before this on the ground of the peculiar configuration of the testicles, 
but becomes now more distinctly separated from 0 pisthorchis by the 
fact that two different forms exhibit the same character. 
6 lonorchis, n. g., O pisthorchiidarum. 
Differs from 0 pisthorchis sensu strictiori by the fact that the 
testicles are not notched or lobate, but distinctly ramified, the 
branches, crossing the intestinal caeca on their ventral side and 
extending very near to the body margin. Another difference seems 
to he in the shape of the excretory vesicle. In O pisthorchis 
s - str. this is \ shaped with a very long stem running in the form of 
an S through the space between the testicles and bifurcating at the 
posterior border of the seminal receptacle into two rather short 
branches from the tops of which the main excretory vessels arise. In 
Clonorchis y the Y shape of the vesicle is no longer clearly recog¬ 
nisable ; the unpaired tube simply becomes somewhat widened at its 
anterior end assuming sometimes, but not always, the shape of an 
nregular triangle the two upper angles of which might be considered 
