47 106 Proceedings of the Royal Irish Academy. 



similar to those found in the adult. The short stout spines are found in the 

 second and third setigerous segments of the larval form, as in the adult. 

 The number of segments with flask-shaped cirri, however, is always five in 

 the larval form, whilst the adult has seven. 



Habitat. — Clew Bay— Frequently taken in the tow-net, generally near 

 the bottom. Ballynakill Harbour. Blacksod Bay. 



Distribution. — British Isles ; Norway ; Skagerrak ; North Sea ; France. 



Family CHAETOPTERIDAE. 

 Chaetopterus variopedatus Benier. 



1894. Chaetopterus variopedatus. De Saint-Joseph, p. 147. 

 This species is occasionally found in sand or muddy gravel near low-water 

 mark in Blacksod Bay. Empty tubes are frequently obtained in the dredge. 

 The living worm was almost always accompanied in its tube by the Polynoid 

 Gattyana cirrosa. 



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

 on 6 occasions, in 1-9 fms. Clew Bay — Dredged on 4 

 occasions, in 16-19 fms. Ballynakill Harbour — Found 

 several times near low-water mark. Bofin Harbour — 

 Found on the shore. 

 Distribution. — Great Britain ; shores of Atlantic ; Mediterranean ; 

 Magellan Straits. 



Family AMMOCHARIDAE. 

 Owenia fusiformis Delle Chiaje. 



1898. de Saint-Joseph, p. 397. 



Habitat. — Blacksod Bay — Found on the shore in sand on 3 occasions. 

 Dredged in 9 fms. Clew Bay — Dredged on 8 occasions, 

 in 4-20 fms., on a bottom of sand or mud. 



Distribution. — British Isles ; Arctic ; Atlantic ; Mediterranean. 



Myriochele Heeri Malmgren. 



1867. Malmgren, p. 101. 1912. Wollebaek, p. 31. 



This species has not previously been recorded from British waters. A 

 number of specimens were found in Clew Bay, living on a sandy bottom. 

 They are all small, with regenerated tails. The tube is composed of 

 fragments of shell, which are set on edge and project at right angles to the 

 tube. It thus differs from the imbricated tube of Owenia fusiformis, and 

 from the membranous tube studded with quartz grains made by Myriochele 

 Heeri in Arctic seas. 



