47 78 Proceedings of fhe Royal Irish Academy. 



may represent young specimens of the present species. The Clew Bay 

 specimens resemble E. arctica in appearance ; but they differ from that species 

 in having no setae but only a spine on the second segment, in having slender 

 elongate conical anal cirri, and broader and more foliate dorsal and ventral 

 cirri The head is longer and more attenuated in front than in the typical 

 form, and the segments are more distinct. The ventral cirrus in the anterior 

 segments is relatively much larger and is attached nearer to the tip of the 

 setigerous lobe. The claw on the end of the shaft of the seta is more 

 prominent. 



The Blacksod specimen, which seems somewhat older, tends more towards 

 the type, though the second segment is provided with a spine on each side. 

 The head is wider, the segments closer together, and the dorsal and ventral 

 cirri more foliate. 



The presence of the spines in the second segment is the chief character 

 distiuguishing these three specimens from E.foliosa. It is possible that this 

 is a juvenile character, and that the spine falls out as the worms grow older. 

 Habitat. — Blacksod Bat — Found on the shore on five occasions. Dredged 

 on two occasions in 3-S fms. Clew Bat — Dredged on 

 four occasions, in 5-26 fms. Dredged in Killary Harbour - , 

 in 6-7 fms., on mud. 

 Distribution. — British Isles ; France ; Scandinavia ; Arctic ; eastern 

 North America. 



Eteone arctica Alalmgren. 

 1908. Eteone arctica. Mcintosh, p. 102. 



The specimens referred to this species have the following characters. 

 The body is 20-23 mm. in length, composed of about 112 segments. The 

 latter are longer and narrower in proportion than those of E. pusilla, and 

 the feet on each side are widely separated from each other. The head tapers 

 in front, and bears two black eyes on its posterior margin. The tentacular 

 cirri are short, the ventral being longer than the dorsal. 



The second segment bears a well-developed setigerous lobe, with setae, 

 and a ventral cirrus. The anal segment has two short spatulate cirri, 

 usually of a dark brown colour. The dorsal and ventral cirri are small and 

 ovate, and the dorsal cirrus is not in contact with the setigerous lobe. The 

 principal tooth on the tip of the shaft of the seta is not much larger than the 

 secondary tooth, and the base of each is markedly spinous. Preserved 

 specimens have a variable amount of brown pigment. There seems to be 

 no valid distinction, in the figures given by Malmgren, between this species 

 and E. Lilljeborgi, E. islandica, E. Leuekarti, E. Sarsi, and E. lentigera, and 

 a further examination of these reputed species is necessary. 



