Clare Island Survey — Archiannetida and Polychaeta, 47 149 



Spirorbis medius Pixell. 



1912. Spirorbis medius. Pixell, p. 800. 



This species has only recently been described from the Pacific coast of 

 Canada. In Blacksod Bay it occurred in dense masses under stones. The 

 Irish specimens agree closely with the description and figures given by 

 Miss Pixell, who has verified the identification. It is a comparatively large 

 species. Mature specimens were found in September, and incubation takes 

 place in the tube. The collar setae of the first setigerous segment show great 

 variation. Some of them have the notch and fin as well developed as those 

 of S. spirorbis, whilst in others the notch is quite absent, and the serrated 

 edge is uninterrupted. All intermediate stages occur. 



Habitat. — Blacksod Bay — Under stones on the shore. 



Distribution. — Departure Bay, Vancouver Island. 



Family HERMELLIDAE. 

 Sabellaria spinulosa Leuckart. 



1894. Sabellaria spinulosa. De Saint-Joseph, p. 154. 



Isolated specimens of this species are common on the shore at Blacksod 

 Bay, living under stones, in Laminaria roots, and on shells. One tube was 

 found embedded in a sponge. It is commonly taken in the dredge, growing on 

 shells and stones. Mature specimens were found in September. 



S. alveolata was not found in the Clare Island area, though it is common 

 in some places on the west coast, forming large reefs. 



Habitat. — Blacksod Bay — Taken on the shore on 17 occasions. Dredged 

 on 4 occasions, in 2-6 fms. Clew Bay — Dredged on 5 

 occasions in 5-17 fms. 



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

 Kattegat. 



APPENDIX TO THE POLYCHAETA. 

 MYZOSTOMARIA. 



Myzostoma cirriferum Leuckart. 



1877. L. von Graff in " Das Genus Myzostoma," p. 10. 



Two specimens of this species were found on the Crinoid Antedon bifida 

 (Pennant), dredged in 4-8 fms. in Ballynakill Harbour, in June, 1902. 

 One specimen was full of eggs. 



This species is widely distributed in European seas and in the 

 Mediterranean. 



