153 
ON AN APPARENTLY NEW TYPE OF THE PLATYHELMINTHES 
(TREMATODA 2). 
By Wituam A. Haswett, M.A., D. Se., Caatuis Proressor or Brotoey, University 
OF SYDNEY. 
(Plate xv1.) 
I.—Inrropucrory. 
When examining a spirit specimen of Exgeus fossor, the remarkable burrowing 
crayfish of Gippsland, Victoria, for specimens of Zemnocephala, I found a number of 
examples of the animal about to be described. Owing to the character of the 
integument, the presence of tentacles and other features, I was at first of opinion that 
the new form was related to the Zemnocephalee and intended to include an account of it 
in my monograph of that family. But having taken advantage of the opportunity 
presented by a visit to the neighbouring colony to examine specimens in the living 
condition, as well as sections of specimens hardened by special methods, I have come 
to the conclusion that the differences between the new form, which I propose to name 
Actinodactylus, and Temnocephala are far too great to permit of their inclusion in a 
single family. 
I have pleasure in here expressing my indebtedness to my friend Prof. W. 
Baldwin Spencer, of Melbourne, for his kindness in procuring the specimens for me 
and in facilitating in every way my work at this subject—most of which was done in 
his laboratory in Melbourne. 
I].—Generat ExrernaL FEATURES. 
Actinodactylus is a very small worm, averaging about 1mm. in length by ‘3mm. 
in greatest breadth. It is dorsi-ventrally compressed, convex above, flat below, 
devoid of segmentation, external or internal. In outline it may be described as pear- 
shaped, the narrower end being anterior. At the anterior end there is, in the living 
and extended condition, a small rounded cephalic lobe ; at the sides of this are a pair 
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