47 124 Proceedings of the Royal Irish Academy. 



Polymnia nebulosa (Montagu). 

 1896. Polymnia nebulosa. De Saint-Joseph, p. 219. 

 1912. Terebdla debilis. Wollebaek, p. 96. 



This species is abundant on the shore, living in long tubes on the under- 

 side of stones in gravel, and in the sand of Zostera beds. The tubes 

 are sometimes as much as a foot and a half long, consisting of a parchment- 

 like membrane covered with sand and pieces of shell. Specimens taken 

 in the dredge are always much smaller than those found on the shore. 

 Mature specimens were found in September. 



Habitat. — Blacksod Bay. — Found on the shore on 15 occasions. Dredged 

 on 4 occasions, in 2-6 fms. Clew Bay — On the shore of 

 Annagh Island. Dredged on 5 occasions, in 4-10 fms., 

 usually on muddy ground. Ballynakill Harbour — Found 

 on the shore on 3 occasions. Dredged on 4 occasions in 1-8 

 fms. 

 Distribution. — Great Britain ; France ; Norway ; Finmark ; Skaggerak ; 

 Helgoland ; Mediterranean. 



Polymnia nesidensis (Delle Chiaje). 



1896. Polymnia nesidensis. De Saint-Joseph, p. 225. 1912. Terebella 



Danielsseni. Wollebaek, p. 97. 



This species is found on the shore, under stones and in the sand of 



Zostera beds. Mature specimens were found from February to May. 



Habitat. — Blacksod Bay — Found on the shore on 8 occasions. Dredged 



on 7 occasions, in 1-8 fms. Clew Bay — Dredged in 



Inishlyre Harbour, in 5 fms. Ballynakill Harbour — 



Dredged on 3 occasions, in 2-9 fms. 



Distribution. — Great Britain ; France ; Scandinavia ; North Sea ; 



Mediterranean. 



Thelepus setosus (Quatrefages). 



1 894. Thelepus setosus. De Saint-Joseph, p. 230. 



This species was common on the shore in Blacksod Bay, living under 

 stones, in Laminaria roots, and in the sand of Zostera beds. It is frequently 

 accompanied in its tube by the Polynoid worm Polynoe scolopendrina. 

 Mature specimens were found in August, the eggs being of a pale salmon 

 colour. 



Habitat. — Blacksod Bay — Found on the shore on 8 occasions. Dredged 

 on 6 occasions, in 3-8 fms. Clew Bay — Dredged on 4 

 occasions, in 9-26 fms. 



Distribution. — Dublin Bay ; south of England ; France. 



