42 18 Proceedings of the Royal Irish Academy. 



New to Ireland. 



Distribution: — North Atlantic and North Sea from Norway to the 

 Azores. 



Family JASSIDAE. 



Parajassa pelagica (Leach). 



Clare Island, south shore of Portanibb, three. 

 New to Ireland. 



Distribution : — Arctic Ocean and North Atlantic from Norway to the 

 British Isles. 



Jassa falcata (Montagu). 



Jassa dentex (Czerniawsky). 



Common in the littoral zone throughout the area. 



Previous Irish Becords .- — Several localities round the coasts (various 

 authors). 



Distribution :— Arctic Ocean, North Atlantic and adjoining seas from 

 Norway to the Azores, Mediterranean, Eio Janeiro, Indian Ocean, Pacific 

 Ocean, and Australian Seas. 



Mrs. Sexton has, to my mind, conclusively proved that Jassa falcata, 

 (Montagu) is synonymous with Jassa pulchdla Leach ; and I therefore have 

 used the former name in preference to the latter, used by Stebbing in his 

 monograph. 



I have given the two specific names above to indicate that I have seen 

 the two forms of male to which these names were given, and not because I 

 believe the species are really distinct. Indeed I share Walker's doubts as to 

 the validity of the two supposed species, and I believe that future research 

 will show that they are only forms or varieties of a single polymorphic 

 species. 



Jassa ocius Bate). 



3^ miles X. J W. of Clare Island light, 25 faths., eight. 



New to Ireland. 



Distribution: — Irish Sea, Mediterranean. 



Ischyrocerus anguipes Kroyer. 



Ballinakill Harbour, five specimens. Bonn Harbour, two. 

 New to the district. 



Previous Irish Becords : — Yalentia and Dalkey (Walker). 

 Distribution : — Arctic Ocean, North Atlantic and adjoining seas from 

 Norway to the British Isles. 



