102 ETEONE ARCTICA. 



It is difficult to know what the Nereis lineata of Montagu 1 is. It may refer to this 

 species. 



2. Eteone arctica, Malmgren, 1867. Plate LVIII, fig. 9 — head; Plate LXIX, figs. 8 and 



9— feet ; Plate LXXVII, fig. 18— bristle. 



Specific Characters. — Head (in spirit) conical, with the diameters nearly equal, the 

 antero-posterior, however, being the longer. No eyes. Tentacles small and tentacular 

 cirri short. Body elongated, with elevated lateral areas at the bases of the feet in each 

 segment. Two somewhat ovate anal cirri. Proboscis, in extrusion, is papillose at the tip 

 and has minute papillae apparently in rows on its surface, but the specimens are imper- 

 fectly preserved. Dorsal cirrus ovate and separated by an interval from the setigerous 

 lobe. The latter is somewhat conical and bears bristles with two strong though not 

 long spines, besides smaller spikes on the ridges of the dilated ends of the shafts. 

 Terminal sabre wide at the base, but rapidly tapers to a fine point. The ventral cirrus 

 is lanceolate, and extends outward about as far as the tip of the setigerous lobe. 



Synonyms. 



Malmgren. Annul. Polych., p. 27, Tab. ii, f. 12. 



Ehlers. Sitz. Phys. Med. Soc. Erlangen, iii, p. 79. 



(?) Mcintosh. Ann. Nat. Hist., ser 4, vol. xiv, p. 197. 



idem. Invert, and Fishes St. Andrews, p. 120. 



idem. Trans. Linn. Soc. Zool., i, p. 502. 



Wiren. Ohsetop. c Vega' Exped., p. 399. 



Levinsen. Vidensk. Meddel. Foren. Kjobenh., p. 208. 



Habitat. — Southport sands (Dr. Carrington, 1866). 



Greenland (' Valorous ') ; Spitzbergen (Ehlers) ; Siberia and Behring's Strait (Wiren). 



Head (Plate LVIII, fig. 9) conical with the diameters nearly equal, though in one 

 the antero-posterior is the longer. No eyes are visible. The tentacles are small, and the 

 tentacular cirri short. 



Body elongated, with the lateral areas in each segment forming fillets at the base of 

 the foot. Posteriorly it terminates in two somewhat ovate cirri. 



The exserted proboscis shows papillae at the tip, and minute papillas in lateral rows 

 on its surface, but the organ is imperfectly preserved and only partially extruded. 



The foot carries dorsally an ovate cirrus, separated by a considerable interval from 

 the setigerous process. It thus agrees with the lamella of E. arctica. The setigerous 

 lobe is somewhat conical and has a series of bristles with a distinct curvature below the 

 enlarged tip, which has two strong though not long spines besides smaller serrations on 

 the ridges. The terminal process is wide at the base but rapidly tapers to a fine point. 

 The edge is apparently minutely serrated, but the points are seen with difficulty. The 

 ventral cirrus is lanceolate and extends outward about as far as the tip of the setigerous 

 lobe. 



Though the eyes are absent, this form would seem to come nearest E. arctica, but 



1 l Trans. Linn. Soc.,' vol. vii, p. 83, 1804. 



1867. 



Eteone arch 



1871. 



)> > 



1874. 



3) ) 



1875. 



}) J 



1878. 



)1 ) 



1883. 



>> y. 



>) 



)) >, 



