47 148 Proceedings of the Royal Irish Academy. 



Harbour is much smaller, the largest specimen having a body 50 mm. long, 

 the usual size being 15-20 mm. The tubes were always attached to stones 

 or shells. Both these forms were obtained in the same haul of the dredge in 

 Killary Harbour. No differences could be found in the setae or shape of the 

 collar in these two forms. In these respects they all agree with the descrip- 

 tions of P. tubularia. The larger form has the habit of P. intestinum 

 (Lamarck). The characters distinguishing these two forms do not seem to be 

 of great weight. 



According to Fauvel, 1 the P. Meilhaci, found at Marseilles and Cette, 

 is identical with P. tubularia. He examined specimens 80-120 mm. in 

 length, comparable with the large specimens from Killary Harbour. 



Habitat. — Killaey Harbour — Dredged on 5 occasions, in 6-22 fms., in 

 mud. Westport Bay — Inishgowla. Dredged in 8-10 fms., 

 in sandy mud. Ballynakill Harbour — Dredged in 2-8 fms. 



Distribution.— Great Britain ; France ; Mediterranean. 



Spirorbis spirorbis (L.). 



1894. Spirorbis borealis. De Saint-Joseph, p. 345. 



This species is extremely common throughout the area. In the littoral 

 region it covers the rocks and Fuci. It is also found on shells, worm-tubes, 

 crabs, &c. The tube varies considerably, ridged and smooth forms being 

 equally common. The smooth form is generally found on seaweeds, the 

 ridged form on rocks. Some forms have narrow mouths, others wide trumpet- 

 shaped mouths. Specimens were dredged in 26 fathoms in Clew Bay, on 

 stones, others in 1 fathom in Blacksod Bay, on Laminaria roots. 



Habitat.— Clare Island; Clew Bay; Blacksod Bay on 24 occasions; 

 Ballynakill Harbour. 



Distribution. — Arctic ; Atlantic ; Mediterranean. 



Spirorbis pusilloides Bush. 



1894. Merapusilla. De Saint-Joseph, p. 351. 



1912. Spirorbis pusilloides. Pixell, p. 797. 



This species is closely related to, if not identical with, the S. Pagen- 

 stccheri of the Mediterranean. Like the latter species, the tube has ridges. 

 It has not previously been recorded from the British Isles. 



Habitat. — Clare Island — On stones from Portlea. Blacksod Bay — 

 On shells of Mytilus and Trochus. 



Distribution. — France (St. Vaast, Arcachon) ; Gabriola Island, British 

 Columbia. 



1 Comptee Rendus de l'Assoc. Franeaiee pour l'Avancenient des Sciences. Lille, 1909, p. 696. 



