STUDIES ON THE DIGENETIC TREMATODES. 427 
regarded as Campula oblonga. The obvious outcome of 
this is that Campula oblonga Cobbold must be considered 
a nomen nudum, and that Braun’s specimens must be 
re-named Brachycladium oblongum (Braun). Iam able 
to offer a justification, in part, of Looss’s conclusions, for in 
a female porpoise which I have recently (August, 1908) 
examined I found in the bile-ducts, in addition to numerous 
examples of Brachycladium oblongum (Brn.), a single 
specimen of another T'rematode. This was accidentally dis- 
covered on washing the parasites, and, in spite of further 
repeated search no more specimens could be obtained. It 
was easily differentiated from Brachycladium oblongum 
by its deep red colour, more elongated body, and the apparent 
absence of spines. I have not yet identified this specimen, but 
it appears to be a speciesof Brachycladium. ‘This species 
could not possibly have been the one Cobbold found, but its 
occurrence shows that more than one '’'rematode species may 
have as its habitat the bile-ducts of Phocena communis. 
The first specimens which I had the opportunity of examin- 
ing formed part of Professor McIntosh’s collection, and were 
obtained by him from the liver of a porpoise shot in Loch- 
maddy (North-West of Scotland) in April, 1865. About fifty 
examples were found, and they were identified by Professor 
McIntosh at that time as Campula oblonga Cobbold. As 
already mentioned I have obtained the same parasite myself 
from one of two porpoises captured in the Firth of Clyde, 
near Millport. The first of these, a young male, was unaffected, 
but in the second, one of the lobes of the liver contained more 
than a hundred specimens. The presence of the parasites in 
the liver was indicated by large yellowish prominences on its 
surface, which felt extremely hard. The same stony hardness 
could be felt throughout the substance of the affected lobe. 
On opening into it the biliary canals were found lined with a 
thick layer of dense fibrous tissue. The terminal parts of the 
canals were usually dilated to form small sacs, in which large 
numbers of the parasite were closely packed together. These 
were, however, easily pressed out. Detailed examination has 
