STUDIES ON. THE DIGENETIC TREMATODES. 441 
the ova in Br. palliatum “haben fast die Gestalt eines 
Rotationsellipsoides.” His hypothesis, therefore, although 
highly probable, requires confirmation, and Looss’s observation 
must first be proved erroneous. 
From the foregoing description it will be apparent that 
Brachycladium oblongum (Brn.) and Br. palliatum 
(Lss.) cannot be confused, tor the two species differ not only 
in their coarser anatomy, as Braun has already demonstrated, 
but also in many of the finer details. It will also be admitted 
that Br. oblongum does not conform strictly to the type of 
Br. palliatum, but differs from it in such important features 
as the structure of the ductus ejaculatorius, the reduced 
condition of the receptaculum seminis, with the presence of 
a receptaculum seminis utermum, and possibly most important 
of all, the shape of the ova. How far any or all of these 
divergences are due to an error of observation on Looss’s part, 
particularly as regards the ova, it is impossible to say, but 
assuming them to be correct there can be little doubt that 
the two species cannot be included in the same genus. Not 
only so but the condition of the ova would render Br. 
palliatum Lss. an atypical member of the BracHycLapiImInx 
according to Odhner’s diagnosis. On the other hand, Br. 
oblongum conforms to the sub-family definition, but is an 
aberrant member of the genus Brachycladium Lss. (type 
Br. palliatum Lss.). At present it seems best to await 
fuller knowledge of Poirier’s species before pronouncing 
judgment on the matter. 
Sub-family AtLocreapun® (Lss. 1899), 
Genus Lebouria n. ¢. 
Lebouria idonea n. sp., Pl. 9, figs. 9-12. 
This form occurred very regularly and always in large 
numbers throughout the intestine of Anarrhichas lupus. 
It also occurred less frequently in the stomach. It is easily 
