F. D. Weidman 
277 
(klados, a branch) testes lying one above (sticbos) the other. With 
the exception of the new superfamilv, the above classification follows 
that given by Fischoeder. Reference to Stiles and Goldberger’s work 
will show that this new high unit is a justifiable one (p. 15) but that 
my material will not lit in with their lower rank diagnosis (pp. 169 and 
170) of Cladorchis and Stichorchis largely on account of the question 
of musculature of the genital atrium. Dr Stiles informs me that he 
would be inclined to separate this beaver fluke from both Cladorchis 
and Stichorchis and make it the type of a new genus on the basis of 
this lack of a genital sucker. This would certainly be necessary to 
Fig. 2. Drawing from photograph of wax reconstruction of internal anatomy. Dorsal 
view: o.s. oral sucker; v.d. vas deferens; t.t. 1 anterior testis; t.t. 2 posterior testis; 
ca. caeca; ov. ovary; ut. uterus; ovd. oviduct; s.g. shell gland; ex.v. excretory vesicle; 
ex.d. excretory duct; ac. acetabulum; l.c. Laurer’s canal. 
accommodate it to Stiles and Goldberger’s classification. 1 feel per¬ 
sonally that the several lots of material should be collected and reviewed 
before reaching a final conclusion, paying special attention to (1) whether 
the genital atrium is or is not musculated, (2) the oesophagus mus- 
culated or not (Otto says it is musculated in the Amphistomidae in 
general), (3) presence of cirrus, (4) general anatomy of vitelline system, 
(5) oesophageal sphincter. 
This paper contributes perhaps more to the subject of the develop¬ 
ment than to that of the anatomy of this fluke. In respect to the 
