100 
THE VOYAGE OF H.M.S. CHALLENGEE. 
ooze. A fragment of the anterior region measuring about 4 mm. in length and 
3 ’5 mm. across the bristles. It is therefore about the same size as that dredged in the 
“Porcupine” in the Atlantic (Station 3) in 1870. It seems to be active and irritable. 
All the scales are likewise absent. 
Lcenilla, Malmgren. 
Lcenilla fusca, n. sp. (PI. XIV. fig. 3 ; PI. VIIIa. figs. 12, 13). 
Habitat. — Trawled at Station 320 (in the Atlantic, off the mouth of the La Plata), 
February 14, 1876; lat. 37° 17' S., long. 53° 52' W. ; depth, 600 fathoms; bottom 
temperature 37°’2, surface temperature 67°'5 ; sea-bottom composed of green sand. It 
occurred along with Polyzoa, Terebella, Hyalinoecia, and Foraminifera. 
A fragment consisting of 1 1 mm. of the anterior region of the body only was 
procured. The greatest breadth is about 14 mm. inclusive of the ventral bristles, which 
extend outward on each side fuUy half the breadth of the body. The dorsum is of a 
rich purplish-brown hue, the surface for the attachment of the scales alone remaining pale 
in the preparation. The colour becomes less intense on the bases of the feet. Inferiorly 
the tint is paler, especially on the feet. The body of this species seems to be fragile. 
The head is mainly distinguished by the peculiar condition and great disparity in 
regard to the size of the eyes. It is pale, with the exception of a faint madder -brown 
blush behind the anterior peaks, and the median brown bar running backward from the 
tentacular region, and therefore is in marked contrast with the deep purplish-brown 
body. A pair of small eyes occur at the posterior border, at each side, and almost 
touching the fold of the body. Besides the black pigment internally there would seem 
to be a pale or greyish region externally. The whole area, however, is much less than 
in the anterior eyes. The latter occupy the lateral prominences, and are only partially 
visible from the dorsum ; indeed their appearance varies according to the angle of 
inspection. Each consists of a large greyish circular area having superiorly a deep 
black spot about the size of the posterior eye in the centre with a black pigment-band 
running anteriorly and posteriorly. When viewed from above, the transparent surface 
of the eye gives a characteristic lustre to the lateral aspect. A line drawn transversely 
through the middle of the head would pass somewhat in front of their central axes. 
The tentacle is absent. Its basal region is brownish, and the bar formerly alluded to 
runs backward therefrom. The antennse are simple subulate organs. The tentacular 
and dorsal cirri show a very slight enlargement below the tip, and have sparsely distri- 
buted short clavate papillae on their surfaces. The tips of the papillae (cilia) are in many 
cases almost globular, from a slight constriction of the neck of the process. The palpi are 
