KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. NtO 7. 5 



two achaetous segments as well as the distribution of the glands. The posterior plafce, 

 which is very påle brown, lacks glands. The tube (external diameter about 2 mm., 

 internal diam. about 1 mm.) is not quite straight, but was probably free; the tube con- 

 sists chiefly of grains of sand, some rather large, and spicules of sponges, the latter pro- 

 jecting 12 mm. and in some places quite predominant; there is also some mud. 



Locality: Fairway Channel, Nanaimo, Vancouver Island, British Columbia, 

 19 / 6 1911, about 37 m. 



Rhodininae. 



Rhodine gracilior (Tauber), var.? 

 1907. Rhodine gracilior (Tauber) Arwidsson (24, p. 74). 



From a locality between Little Cumbrae and Millport, Firth of Clyde (Sept. 1912, 

 mud) there are 3 anterior ends, 2 of which comprise at least the foremost of the posterior 

 collar-bearing segments. It now appears that one specimen has its foremost collar on 

 the 17 th setigerous segment, as is characteristic of the species — whereas on another 

 the same collar does not occur until the 18 th setigerous segment. Both specimens have 

 typical double rows of uncini up to the 15 th setigerous segment inclusive and simple 

 rows from the 16 th setigerous segment. The epidermal glands are on the whole like those 

 of the main species, but no narrow band — or at least no very marked one — was observed 

 at the boundary of the collar of the 3 rd setigerous segment. Nor did I find any con- 

 necting piece on the dorsal si$e of the anterior part of the same segment (ef. Nolte, 

 30). The nephridia, uncini and tubes agree with those of the Bohuslän specimens. 

 — The 3 specimens all have the anterior end, comprising 1, 2 and 6 setigerous segments 

 respectively, regenerated. 



Two other specimens (anterior ends) were also taken at Millport, off Great Cum- 

 brae, mud, 11—12.5 m., July, 1910. 



Although this material agrees in essential parts with the main species, yet, owing 

 to the absence of the marked glandular band on the 3 rd setigerous segment, so character- 

 istic of the main species, and the variation with regard to the first posterior collar- 

 bearing segment, it seems to me best at present to hesitate a little before fully identify- 

 ing these individuals with the typical Rh. gracilior. Of the latter, in spite of the very 

 great number of investigated specimens from Bohuslän, only one specimen is known, 

 which differs with regard to the first posterior collar-bearing segment (24, p. 76); but 

 in that case we have obviously to do with something different, partly because this first 

 collar-segment is displaced considerably forward and partly because the first segment 

 with a simple row of uncini has been displaced in the same way. On the other hand 

 we may, however, recall Rhodine intermedia Arwidsson (27, p. 11), which shows varia- 

 tions, observed in several cases, just in regard to the appearance of the first posterior 

 collar. 



