300 RHODINE GRACILTOR. 



of the succeeding segments. Behind these are a reddish point and seven to eight bristled 

 segments. Tube rigid, encrusted with sand. 



Synonyms. 



1869. Rhodine Loveni, var., Mcintosh. Trans. Roy. Soc. Edinb., vol. xxy ; p. 420, pi. xv, fig. 16. 

 1879. „ J} var. gracilior, Tauber. Annul. Danic, p. 123. 



„ ,, ,, var. breviceps, idem. Ibid., p. 123. 



1906. „ „ Arwidsson. Skand. u. arktisch. Maldan., p. 74, Taf. ii, figs. 53—58; Taf. vii, 



figs. 237—241 • Taf. viii, figs. 242—243. 

 1913. „ „ var., Mcintosh. Ann. Nat. Hist., ser. 8, vol. xi, p. 85. 



„ ,j gracilior, Nolte. Wiss. Meeresnntersuch., n. f., Bd. xv, p. 19, Taf. i, figs. 1 and 25 ; 



Taf. ii, fig. 26, text-fig. 4. 



Habitat. — Dredged off the Hebrides by Dr. Gwyn Jeffreys in June and July, 1866. 



Abroad it is found off Sweden, Norway, Spitzbergen, and off the Faroes. 



As only softened fragments have been procured in the British seas, the following 

 brief account of the external aspect is after Arwidsson. 



Cephalic region bluntly conical in front, forming a short cone when viewed from the 

 dorsum, and a flattened beak when seen laterally. The nuchal grooves run forward on 

 each side of the short keel, and then curve outward and slightly backward to the margin. 

 The condition of the proboscis is unknown. 



The body is of variable length, Arwidsson mentioning one of 47 to 50 mm. in length 

 and 2 mm. in diameter, and with thirty-five bristled segments. The first bristled 

 segment is long, and the collars of the two following segments are shorter dorsally than 

 ventrally. These collars have a smooth edge in the living form, but are crenated when 

 preserved. The collars (Plate XCIX, fig. 8) extend to the seventeenth segment inclu- 

 sive. Behind the bristled segments are one or two devoid of bristles, and the body ends 

 in a blunt papilla with the anus beneath. 



The Nephridia occur in bristled segments 5 to 9. 



Few glands occur on the head. On the first bristled segment is a glandular band at 

 the feet, and so with the second, and glands occur on the inner side of the collar. On 

 the third segment the band is broader, and so in segments 4 to 9. The glands are 

 continued posteriorly at the hook-rows, and also occur on each side of the ventral ridge 

 (nerve-cord). 



From the fifth to the fifteenth bristled segment the hooks are in double rows, and 

 though similar to those of B. Loveni (from the ' Valorous ' Expedition) they are distin- 

 guished by the shorter spike-like process behind the great fang (Plate OVIII, fig, 3 b, and 

 Plate CIX, fig. 1). Above the main fang are more numerous teeth than in Arwidsson's 

 figure, 1 and instead of the short conical point the British examples had a process at the 

 tip of the cone, though much less than in B. Loveni. A tendency to a truncated instead 

 of a smoothly-rounded prow was also noticeable, as well as a slightly sinuous margin just 

 behind or below the prow, as indicated in the figure. The whole aspect of the anterior 

 regions of the respective hooks differs, the great fang is much larger proportionally, 



i Taf. vii, fig. 237. 



