98 
A NEWVARIETY OF PLEUROCRYTA GALATHEAE 
FROM THE NORTHUMBERLAND COAST. 

By F. W. FLATTELY,. M.Sc. 

In August of last year (1921) when shore collecting close to 
St Mary’s Island (Northumberland) I secured a specimen of 
Galathea squamifera, which proved to be parasitised by an adult 
female Pleurocrypta, carrying a male attached to the underside 
of the abdomen. 
Since the specimen appears to coincide completely neither 
with Pleurocrypta galatheae as described by Bonnier nor with the 
P. longibranchiata of Sars, and since also properly authenticated 
records of these parasites are distinctly rare from British coasts, 
a short record of its chief characteristics would appear to be useful. 
A striking feature of the female is its perfect bilateral symmetry. 
This, though not a diagnostic character—the degree of asymmetry 
in Bopyrids being usually subject to variation according to the 
particular position occupied by the parasite in the gill chamber— 
is of considerable interest physiologically since the present specimen 

Fiacure I. 
PLEUROCRYPTA GALATHEAE. 

1.—Inner aspect of first right oostegite. 2.—Outer aspect of same. 
