104 ETEONE SPETZBERGENSIS. 



The body is most dilated anteriorly, only narrowing a little immediately behind the 

 head. It then tapers gradually towards the tail, which is terminated by two linear, 

 fusiform, or almost cylindrical cirri. It is rounded dorsally and flattened ventrally, and 

 is pale with a slight iridescence throughout. 



The foot (Plate LXIX, figs. 8 [10th] and 9 [70th] ) has dorsally a more or less ovoid 

 cirrus which at the tenth foot is comparatively small, and truncated at the base, where it 

 abuts on the peduncle. The setigerous process is greater in diameter and projects 

 further outward. At the thirtieth foot it has become ovato-lanceolate, and extends 

 considerably further than the setigerous lobe. Behind the foregoing it is more acutely 

 lanceolate, and its peduncle is longer. The streaks in the hypoderm of the organ have a 

 fan-like arrangement. The setigerous lobe is largest anteriorly, is bifid, and has a series 

 of pale slightly curved bristles (Plate LXXVII, fig. 18), the shafts of which have slightly 

 dilated tips with a larger and smaller curved hook and minute spines passing downward 

 to the shoulder. The terminal process is broad at the base, tapers gradually to a fine 

 point, and has a serrated edge. It is of average length, The ventral cirrus is lanceolate, 

 about as long as the setigerous lobe at the tenth foot, and somewhat longer and more 

 acuminate posteriorly. 



This species seems to approach most closely to Eteone arctica, Mgm., from which it 

 differs in the absence of eyes (which, however, occasionally disappear in spirit in other 

 examples), in the ovato-lanceolate superior cirrus, and in the somewhat narrow lanceolate 

 shape of the ventral cirrus, instead of the subobtuse lamella of E. arctica. Malmgren's 

 figure (Plate II, fig. 12, c'), however, shows a closer approach than his description. The 

 greater size and leaf-like condition of the dorsal cirri in E. Robertiana in contrast 

 with E. arctica is also a distinguishing feature. 



On the whole it would appear that Eteonella Robertiana, is only a well-marked variety 

 of Eteone arctica. 



3. Eteone spetzbergensis, Malmgren, 1865. Plate LXIX, figs. 5 and 6 — feet; PI. 



LXXVII, figs. 16-16 6— bristles. 



Specific Characters. — Head somewhat elongated, separated dorsally from the peri- 

 stomial segment by converging lines ; bluntly rounded in front. Tentacles short, the upper 

 in front of the ventral. Two pale eyes occur posteriorly, but they disappear in the spirit 

 preparations, in which the head is also contracted into a short cone. Tentacular cirri 

 short, the ventral being the longer. Body three and a half inches long, about equally 

 tapered anteriorly and posteriorly, and terminating in two linear fusiform cirri (Malmgren). 

 Several preserved examples show a brownish pigment-band on each side dorsally, within 

 the bases of the feet. Proboscis in extrusion is clavate, with two median and two lateral 

 rows of papillae, which begin as prominent organs and end in low transverse elevations. 

 On the ventral aspect four longitudinal bands are also present, but they show only low 

 transverse folds or wrinkles. The aperture is dorsal, somewhat triangular, and papillose. 

 Dorsal cirrus at the tenth foot is sub-circular, but posteriorly the peduncle lengthens, and 

 the organ becomes renif orm with the larger end external. The setigerous process increases 



