108 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
shaped. The male inhabits the same cyst, is entirely 
filiform, and about 5 to 15 mm. in length. Two of the 
males are seen attached to the branchial arch between the 
median and the right cysts. These males are adhering to 
the tissues of the host by their anterior suckers, and the 
females are probably also so attached. 

Fic. 5. Part of a gill of Brama raii with cysts containing Koellikeria 
jilicolle. The right hand figure represents one of the parasites. 
The parasite appears to be one which always occurs 
on the same host—Ray’s Bream. Whether the sexes are 
separate or the animals are not really hermaphrodites it is 
impossible to say, in the absence of more material than 
has yet been obtained. 
(3) PoONTOBDELLA LAEVIS (BLAINVILLE). 
A single specimen of a leech, which is probably the 
above species, was given to Capt. Wignall (who handed 
it to me) by Mr. F. Bailey, Inspector at Fleetwood Fish 
Market. It was caught by the steam trawler ‘‘ Kuston,”’ 
of Fleetwood, off Barra, in October, 1910, and the mate, 
recognising that 1t was not the ordinary Skate-leech, put 
