PYCHNOGONIDA. 413 



Genus MuNNA. 

 31. Kroyeri, Goodsir. 



Taken in a towing-net on the surface of Strangford Lough in May, 

 1840, by Mr. R. Patterson. 



The genus 3Iiuina was described by Kroyer in 1841, and Mr. Goodsir's 

 M. Kroyeri was obtained in July, 1842, in the Firth of Forth. 



Gemis Pasithoe. 



P. vesiculosa, Goodsir. 



My specimen of this rare form was dredged at Dalkey island, Bay of 

 Dublin, in August, 1840, K. Ball, E. Forbes, W. T. Mr. Goodsir's was 

 procured in the Firth of Forth. 



Genus PtCHNOGONUM. 



P. hal(e7iaruin, Fabr. 



This common species was accidentally omitted in former " Additions to 

 the Fauna of Ireland." Pyc. halcenarion 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 mesemhryanthe- 

 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. 



