PYCHNOGONIDA. 
413 
Genus MuNNA. 
M. Kroyeri, Goodsir. 
Taken in a towing-net on the surface of Strangford Lough in May, 
1840, by Mr. It. Patterson. 
The genus Munna was described by Kroyer in 1841, and Mr. Goodsir’s 
M. Kroyeri was obtained in July, 1842, in the Firth of Forth. 
Genus Pasithoe. 
P. vesiculosa , Goodsir. 
My specimen of this rare form was dredged at Dalkey island, Bay of 
Dublin, in August, 1840, R. Ball, E. Forbes, W. T. Mr. Goodsir’s was 
procured in the Firth of Forth. 
Genus Pychnogonum. 
P. balcenarum, Fabr. 
This common species was accidentally omitted in former “ Additions to 
the Fauna of Ireland.” Pyc. balcenarum must on our coast be content 
with a smaller victim than a whale, and condescends to suck the juices of 
an Actinia. In January, 1834, several of these parasites, from a very 
minute to a middle size, were found upon the Actinia mesembryanthe- 
mum at Bangor by Mr. Hyndman and myself : on the shore near Dublin, 
the Pychnogonum has likewise been taken on Actinia by Dr. Bellingham. 
Specimens from Ballintrae, Ayrshire, and Whitehaven, Cumberland, are 
in my collection : among oysters brought from the latter place to Belfast, 
I have found them particularly numerous. 
