127 
been described under the name of Distoma coelomaticum and tin- 
question now arises: is this Distoma coelomaticum of Indo-Chma 
really the same form as the Distoma pancreaticum of Japan? It tin-. 
were so, then the smaller IIong-Kong form would have to be identified 
as the genuine Distoma pancreaticum, the name coelomaticum would 
have to be definitely dropped as a synonym and a new specific name 
would have to be given to the larger IIong-Kong species with tin* 
strongly developed suckers. 
As I have already pointed out, the data given in the printed 
description of the original Japanese pancreatic fluke are not sufficient 
to decide the question. I possess, however, in my collection a number 
of specimens of Distoma pancreaticum which I owe to the kindncs- 
of Professor JANSON, of Tokio. They were collected from the 
pancreatic ducts of cattle in Japan and I think there can not be an) 
reasonable objection to the assumption that they are specifically tin 
original Japanese Distoma pancreaticum. It is true that the fir-t 
specimens of this species exhibited in Paris were labelled as collected 
from sheep, but 1 am not inclined to attribute a great importance to 
this difference in the host, because it is a well-known fact that many 
parasites of cattle and buffaloes occur not only in sheep but in otliei 
ruminating animals also. A comparison of this Japanese material lias 
now shown, first, that there is only one species present in it and. 
second, that this species is identical with the larger species of the 
Hong-Kong material. On the ground of these facts I feel justified 
in considering this latter species as the genuine Distoma pancreaticum 
of JANSON ; for the smaller species I readopt the name coelomaticum of 
CSiard and Billet, the suppression of which was, in the sense of the 
nomenclatural rules, a mistake based upon an erroneous identification 
of the species. 
Eurytretna, nov. gen., Dicrocoeliidarum, 
Differs from Dicrocoeliuni especially by the following particular- 
body rather thick and considerably broadened, with the exception of 
the hindmost part which retains its original shape and appears as ,1 
small triangular appendage sharply set off from the rest of the body . 
it is repeatedly referred to in the descriptions of the earlier authors a- 
resembling in outline the cephalic part of Fasciola hepatica. Suckers 
very large and prominent, the oral sucker completely ventral and 
