98 ETEONE. 



in an anal papilla—probably flanked by two cirri. Dorsal surface bluish in spirit, ventral 

 surface pale cinnamon, both being iridescent. Dorsal and ventral cirri of a cinnamon 

 colour. Dorsal region of the foot less than in G. lutea, the dorsal cirrus ovato -lanceolate 

 in front or ovate posteriorly, veined and carried horizontally, the tip more acute than in 

 the former, but less acute than in G. citrina. Setigerous region has a single yellow spine. 

 Bristles have a well-marked dilatation at tbe end of the shaft and with minute spines 

 guarding the base of the terminal process which is finely tapered. Ventral cirrus borne 

 vertically, reniform. A mamilla (papilla) occurs at the inner border of the foot. 



Habitat— Coast of Galway, Dr. E. P. Wright, 1868. 



Head (Plate LVIII, fig. 8) rounded ovoid, with two black eyes of considerable size. 

 Tentacles and tentacular cirri as in allied forms. 



Body linear, about an inch long, slightly tapered in front, more so posteriorly, 

 and terminating in the anal papilla, which was probably flanked by two cirri. The 

 dorsum in spirit has a bluish tint, and the ventral surface a pale, cinnamon hue — both 

 being iridescent. The lamellae were of a cinnamon colour. 



The dorsal region (pedicle) of the foot (Plate LXIX, figs. 1 [tenth] and 2 

 [fortieth]) is less than in G. lutea — forming a short truncate process supporting the 

 cirrus, which is comparatively large and cordate, the "bite" at the base being less than 

 in the two foregoing species. The lamella has the same leaf -like series of veins, but on 

 the whole has a more acute tip. It is carried somewhat horizontally, so that in series an 

 imbricate arrangement is produced. The lamellae are rather more acute posteriorly. 



The bifid setigerous process is of average length, and bears a pale spine and a series 

 of translucent bristles, the shafts of which are slightly curved and have a well-marked 

 dilatation at the tip, with minute spines guarding the base of the terminal process, which 

 is finely tapered (Plate LXXVII, fig. 15) and by no means long. The ventral cirrus is 

 borne vertically, and has a somewhat reniform outline. A distinct mamilla occurs at the 

 inner border of each foot. 



So far as can be observed this does not appear to be the young stage of either of the 

 foregoing. 



Genus XXXVI. — Eteone, Savigny, 1820. 



Head elongated antero-posteriorly or somewhat trapezoidal in spirit, with or without 

 eyes ; two pairs of short tentacles ; two pairs of tentacular cirri, the first on the first 

 segment, the second on the following. Body devoid of metallic lustre ; segments similar. 

 Proboscis with cordate or with pointed papillae ; an obtuse rigid papilla on each side of the 

 aperture in extrusion. Anal cirri leaf -like. Feet simple ; dorsal cirrus sessile, simple, 

 and leaf -like, much larger than the ventral cirrus. Dilated ends of the shafts of the 

 bristles with large hook-like spines and short terminal blades. 



Small Annelids — chiefly characteristic of the northern seas, and sparingly distributed. 



The body-w^all of JEteone sjpetsbergensis (Fig. 43) is distinguished by the massive 

 longitudinal muscles — both dorsal and ventral. The dorsal form a broad arch in section 



