46 



Proceedings of the Royal Irish Academy. 



CALYPTOBLASTEA. 



Family — Haleciid^. 

 Halecium halecinum (Linn.). Thoa halecina, Lamoiiroux. 

 i., ii., iii., iv., v., . 

 Common round the coast. 



Halecium muricatum (Ellis and Solander). Thoa muricata, Couch. 



i., ii., . . • . 



i. The Giant's Causeway (Hassall '41b). 



ii. ''A specimen (of H. muricatum) was found in the late W. 



Thompson's collection, marked Is^ewcastle, county Down " 

 (Hyndman '58). 



Halecium beanii (Johnston). Thoa heanii, Johnston, 

 i., ii., iii., iv., v., . 

 Common round the coast. 



Halecium tenellum, Hincks. 

 . ii., . . . vi. 

 ii. Monkstown (Mackintosh '78). 



vi. On Tuhdaria, from the Fairy Bridge, Bundoran (Duerden '95a). 



Halecium plumosum, Hincks. 

 This species was described from a single Irish specimen in the 

 collection of Trinity College, Dublin (Hincks '68). 



Family — Campantjlariid^. 



Clytia johnstoni (Alder). Campanularia voluhilis, Lamouroux. 

 Campanularia johnstoni, Alder, 

 i., ii., iii., iv., v., . 



One of the commonest hydroids round the coast : apparently not 

 yet recorded from vi. 



Obelia geniculata (Linn.). Laomedea geniculata, Lamouroux. 



i., ii., iii., iv., v., vi. 

 This very common hydroid has been recorded all round the coast. 



