47 104 Proceedings of the Royal Irish Academy. 



Habitat. — Blacksod Bay — Pound ou the shore, on 9 occasions.- Dredged 

 on 4 occasions, in 1-8 fins. Clew Bay— Shore of Clare 

 Island, in sponges and in Lithothamnion. Dredged on 5 

 occasions, in 9-28 fins. 



Distribution. — Plymouth; France; Arctic; North Sea ; Faroe. 



Polydora flava Claparede. 

 1896. Polydora flava. Mesnil, p. 182. 



This species was found living in Lithothamnion, and between flakes of 

 schist. 



Habitat. — Blacksod Bay — Found on 2 occasions on the shore. Dredged 

 on 2 occasions, in 3|-5| fms. Clew Bay— Dredged in 

 16 fms. 

 Distribution. — British Isles ; France ; Mediterranean. 



Polydora Giardi Mesnil. 



1896. Polydora Giardi. Mesnil, p. 195. 



This species, which has not been previously recorded from the British 

 Isles, is rare in the district. It was found only in Laminaria roots. Mesnil 

 found it only in Lithothamnion. 



Habitat. — Blacksod Bay — Found on the shore on 4 occasions. Cleav 

 Bay— Dredged in 13-1 6 fms. 



Distribution. — North of France (St. Martin and Cap de la Hague) ; 



? Marseilles. 



Polydora Caulleryi Mesnil. 



1S97. Polydora Caulleryi. Mesnil, p. 88. 1909. Polydora Carazzi. 



Mcintosh, p. 172. 



A single specimen of this species was dredged in Clew Bay, in 24 fms., on 

 a bottom of sand or shells. 



Habitat. — Clew Bay— Dredged in 24 fms. 



Distribution. — Great Britain ; France (Cap de la Hague). 



Polydora quadrilobata Jacobi. 



1897. Polydora quadrilobata. Mesnil p. 87. 1909. /'. ,p Mcintosh, 

 [>. 170. 



A single specimen of this rare species was found in the sand of a Zostera 

 bed in Blacksod Bay. It agrees exactly with the descriptions of Mesnil and 

 Mcintosh. The modified setae of the fifth segment have the brush-like row 

 of spines between the two terminal teeth. 



Habitat. — Blacksod Bay — In the sand of a Zostera bed. 



Distribution.— Scotland (?St. Andrews) ; West Baltic (Kiel). 



