296 EITNOA TRITONI. 



Zembla). The processes on the scales vary considerably in size, but he did not 

 sufficiently discriminate between the forms. 



The Polynoe islandica of Dr. Hansen (1882) 1 is probably either a variety of this 

 species or E. oerstedi, in which the tentacles are smooth. His P. arctica* I would also 

 be inclined to unite with the same form. Nor does any other conclusion seem to present 

 itself with regard to his P. assimilis* his P. spinulosa* or his P. foraminifera. 5 From the 

 inexperience of the artist, Dr. Hansen's figures are not reliable, the tentacular cirri, for 

 instance, springing as a single trunk which becomes bifid, a condition which can only 

 occur as an abnormality. 



Wiren, in his account of the annelids of the 'Vega' Expedition, expresses the same 

 view as Theel and the writer, and he gives notes on five varieties, with figures of 

 three examples of scales, which differ considerably in regard to the papillge. 



2. EUNOA TRITONI, Mcintosh. 

 1898. Eunoa Tritoni, Mcintosh. Ann. Nat. Hist., Aug., 1898. 



Specific Characters. — Head somewhat pyriform, with the broad end posteriorly, 

 a median furrow and two minute peaks close to the base of the median tentacle. 

 Eyes equal, of moderate size, placed on each side of the lateral eminence. Lateral 

 tentacles short and densely ciliated. Palpi with rows of minute clavate cilia. Body 

 normal ; segmental papillae commence on the sixth foot and continue almost to the 

 posterior end. Scales reniform in outline, densely fringed with long cilia on the outer 

 edge. The surface of the scale has a series of capstan-like tubercles with a minutely 

 nodular surface towards the posterior border, the general surface being studded with 

 minute spines. Dorsal and ventral divisions of the foot have each a long process for the 

 spine. The dorsal bristles are long, little tapered at the tip, which forms a short blunt 

 cone invaded by the spinous rows so closely that the tip of the bristle is almost reached. 

 Ventral bristles with slender shafts, spinous tips of the average length, and a long and 

 rather broad terminal region, with a well-marked hook. 



Trawled on board H.M.S. 'Triton,' at Station 8 (Faroe Channel?), 22nd August, 

 1882, in 640 fathoms. 



A comparatively large species, about 34 mm. long. 



Head. — Somewhat pyriform, with the broad end posteriorly, a median furrow in 

 front, and two minute peaks close to the base of the median tentacle. Eyes of moderate 

 size, equal, visible from the dorsum, placed on each side of the lateral eminence, and thus 

 towards the middle of the region. The anterior pair look slightly forward and outward. 

 Median tentacle absent. The lateral are comparatively short and densely ciliated. The 

 palpi have rows of minute clavate cilia. Tentacular cirri absent. 



1 c Norweg. N. Atlantic Exped./ p. 24, pi. i, figs. 15—21. 



2 Ibid., p. 27, pi. iii, f. 1—5. 



3 Ibid., p. 27, pi. i, f. 22—26. 



4 Ibid., p. 28, pi. i, f. 6—10. 



5 Ibid., p. 29, pi. i, £. 11—14. 



