47 32 Proceedings of the Royal Irish Academy. 



respects differs widely. The setae are of quite a different type. The struc- 

 ture of the simple winged setae and the thick spines of the anterior segments 

 show close relationship to the genus Streptosyllis, which has, however, an 

 unarmed proboscis. 



Habitat. — About 1 mile N.N.E. of Cleggan Head, Co. Galway. Taken in 

 the mid-water tow-net at 9 fathoms, soundings 18 fms-.. 



Eusyllis tubifex (Gosse). 



1867. Eusi/Uis Blomstrandi. Malmgren, p. 40. 1SS6. E. B. de St.-Joseph 

 p. 171. 1908. E. t. + E. B. Mcintosh, pp. 174, 176. 



This species occurs in immense numbers amongst weeds and on Laminaria 

 roots. It may be found in rock-pools in the upper littoral zone. The delicate 

 tubes in which it lives are often found on the blades and stems of Laminaria 

 in vast numbers. 



Mature forms of this species were found from March to May. In 

 the males, the swimming setae begin on the 17th setigerous segment. 



In the feet of the posterior segments, there is a simple seta both dorsally 

 and ventrally, the latter being bifid. 



I have been unable to distinguish between E. tubifex and E. Blomstrandi. 

 Elwes records E. tubifex as common on the south coast of England, whilst 

 de St.-Joseph found E. Blomstrandi on the north coast of France. The only 

 investigator recording both species is Mcintosh (torn, cit.) ; and his descriptions 

 and figures afford no evidence that the two species are distinct. A. specimen 

 in the Irish National Museum, labelled Eusyllis Blomstrandi by Mcintosh, 

 differs in no way from the common form. 



Habitat. — Blacksod Bay — Taken on the shore on eleven occasions. 

 Dredged on five occasions in 3-6 fathoms. Clew Bay — 

 Dredged on twenty-three occasions, in 3-28 fathoms. 

 Ballyxakill Harbour — Dredged on seven occasions, in 

 2-9 fins. Bofk Harbour — Taken in the surface tow-net. 

 Distribution. — British Isles ; Spitsbergen ; Nova Zembla : North Sea ; 

 France ; Madeira ; east coast of Canada ; Mediterranean. 



Odontosyllis gibba Claparede. 



1908. 0. g. Mcintosh, p. 183. 



This species is extremely abundant throughout the district, and seems 

 to have no preference for any particular habitat. When irritated it shows 

 a brilliant green phosphorescence, which seems to be located in the parapodia. 

 It ranges up to half tide-mark. 



