47 128 Proceedings of the Royal Irish Academy. 



Polycirras haematodes (Claparede;. 



1894. Polycirrus haematodes. De Saint-Joseph, p. 241. 

 In the littoral region this species was always obtained from Laminaria 

 roots. It was taken a few times in the dredge. Mature specimens were 

 found in August. The capillary setae of this species are frequently serrate 

 at the tip, owing to abrasion of the blade. 



Habitat. — Blacksod Bay — Taken on 3 occasions on the shore, in Laminaria 

 roots. Clew Bay — Dredged on 2 occasions, in 8-16 fins. 

 Ballysakill Harbour — Dredged in 6-8 fms. 

 Distribution. — Scotland (Tairlie Channel); Trance; Madeira; Xaples. 



Polycirrus denticulatus de Saint-Joseph. 



1894. Polycirrus denticulat-its. De Saint-Joseph, p. 242. 



This species was particularly characterized, according to de Saint-Joseph, 

 by the serrate wings of the capillary setae. My observations on several 

 species have convinced me that this character is of no importance. The 

 serration of the delicate edge of the setae is caused by abrasion. I have 

 frequently found smooth and serrate setae in the same bundle. In this genus 

 the capillary setae have a fibrous structure, and readily become frayed at the 

 edge. 



There is great resemblance between this species and P. haematodes 

 ( Claparede). The chief differences are (1) the absence of uncini from the 

 thoracic region in P. haematodes ; (2) in P. denticulatus the winged portion 

 of the capillary setae is shorter than in P. haematodes. It is possible 

 that the species P. triglandula Langerhans, and P. tenuisetis Langerhans, are 

 identical with the present species. According to Langerhans, these two species 

 have only three pairs of nephridia ; but he may have overlooked the three 

 posterior pairs, which, in P. denticulatiLS, are very small, and are hidden by 

 an overlying sheet of muscle. 



Habitat.— Blacksod Bay — Obtained on one occasion in Laminaria roots on 

 the shore. Ballysakill Harbour — Dredged on 2 occasions, 

 in 3-8 fms. 



Distribution. — Trance (Dinard). 



Terebellides Stroemi Sars. 



1865. Terebellides Stroemi. Malmgren, p. 396. 1912. Terebellides 



Str'&mi. Wollebaek, p. 78. 



This species is usually found in mud, or in the sand of Zostera beds. 

 Mature specimens were found in May and Xovember. The geographical 

 range is very extended, stretching from the Arctic to the South Pacific. 



