Clare Island Survey — Archiannetida and Polychaeta. 47 19 



specimens of Paedophylax lubes, named by Webster and Benedict. Unfor- 

 tunately the specimens had been mounted in Canada balsam, so it was 

 difficult to make out the minute structure of the setae. There is very close 

 agreement in the structure of the head and tentacles, feet, setae, and 

 alimentary canal. The compound setae, very imperfectly figured by Webster 

 and Benedict, resemble those shown in fig. If, b. The chief differences 

 between the Irish and American specimens are in the shape of the simple 

 setae and the length of the various divisions of the alimentary canal. In 

 the American specimens, a dorsal simple seta appears in the 10th-12th foot. 

 It is, as figured by Webster and Benedict (1884, PL III, fig. 35), a strong, 

 almost straight seta with a simple pointed tip. In a few of the posterior 

 segments there is also a simple ventral seta with a bifid tip {torn, cit., PI. Ill, 

 fig. 36). The Irish specimens differ in that all the simple setae are of this 

 latter type, with bifid tips (fig. If, a). As stated above, their arrangement is 

 subject to considerable variation. As regards the anterior end of the 

 alimentary canal, there is very close agreement in the shape and proportions 

 of the various parts, the American specimens, like the Irish, having a layer of 

 dark pigment round the proboscis. The stomach in the American specimens 

 is however, proportionally longer than in the Irish specimens, though there 

 is some variation in this respect. 



It seems advisable under the circumstances to recognize the differences 

 between the two forms by regarding the Irish specimens as a variety of the 

 American species. 



I have found this species in Blacksod Bay, Clew Bay, Lough Swilly, 

 Galway Bay, and in 78 fms. off the coast of Co. Kerry. 



Habitat. — Blacksod Bay — A single specimen in the sand of a Zostera 

 bed on the south shore of Elly Bay. Clew Bay — Dredged 

 in 24 fms., on a bottom of sand and shells. Dredged in 

 Kiilary Hbr., in 7 fms. 



Distribution. — Provincetown, Mass. ; Eastport, Maine. 



Sphaerosyllis hystrix Claparede. 



1908. S. h. Mcintosh, p. 156. 



Mature specimens were found from May to October, and were occasionally 

 taken in the surface tow-net. Swimming bristles occur from the 10th or 11th 

 setigerous segment to the tail. Some females had two eggs in each segment, 

 others four ; and the eggs occupy the eighth to nineteenth setigerous segments. 

 The packets of rhabdites commence in the fourth setigerous segment. A 

 simple pointed seta is present dorsally in nearly all the feet, and this is joined 

 in the posterior segments by a similar ventral seta. 



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