52 
THE VOYAGE OE H.M.S. CHALLENGER. 
from that of any known form. It is prominent and rounded, having anteriorly a little 
conical papilla in place of a median tentacle. On each side is a rather small ocular 
peduncle without a trace of pigment. The fimbriated prefrontal lobe of the others is 
here represented by a smooth tongue-shaped process, which from its concamty superiorly 
is spoon-like. Posteriorly is a very deep pit on each side of the nuchal bridge of 
the head. Moreover, after removal of the first scale a somewhat triangular thin lamella 
(with the point in front) projects forward beyond the ocular peduncles and partly shades 
the side of the head. The palpi are about the length of those in the British species. 
The tentacular cirri are absent, but the dorsal show a decided difference in regard to the 
general contour. The organ is somewhat shorter proportionally than in Lcetinonice 
Jilicornis, and tapers more distinctly below the tip, so that the latter forms an elongated 
ovoid nearly twice the diameter of the neck below. In Lcetinonice Jilicornis the neck is 
somewhat thicker than the commencement of the tip. As Claparede truly remarks,^ these 
organs are well fitted for showing the terminations of the nerves. The ventral cirrus 
resembles that in the previous forms, being subulate and short. Posteriorly, however, 
it becomes elongated. 
The great dorsal spines form a conspicuous fringe to the sides of the body. They 
have a lustrous brown colour, and are considerably shorter and broader than m Lcetinonice 
Jilicornis. Their points, moreover, are simple throughout (PI. Va. fig. 12). The ventral 
bristles, again (PL Va. fig. 13), lean towards the structure seen in Aplirodita, and it is easy 
to conceive the passage from the densely spinous ventral tips of such as Lcetinonice 
japonica to the hairy condition of this species. Those of the first eight or nine anterior 
feet differ from the succeeding in having a series of minute serrate bristles (PI. Va. fig. 14), 
along with one or more stout brownish spines (PI. Va. fig. 15.) A series of intermediate 
forms between the one and the other generally occur in each foot, some of the smooth 
forms having the shape of a dart with a finely tapered point. Towards the posterior end 
of the body the serrate kind also occurs, but the tips are extremely elongated in the 
posterior feet. Some of those with the dart-like smooth tips are curiously wrinkled. All 
these features clearly agree with the morphology and relations of the several forms above 
mentioned. 
The species at first sight resembles a Lcetinonice, but the absence of the long median 
cephalic and the lateral tentacles is diagnostic. The long palpi, however, still remain. 
To the naked eye the dorsal and ventral bristles and their arrangement ajopears to be 
similar, only the former are less covered with mud than usual. On the other hand, it 
quite differs from Aplirodita in the absence of the iridescent hairs composing the felt, in 
the characters of the dorsal spines, and in the flattened form of the body, which in 
outline, however, more nearly resembles Apihrodita than Lcetinonice. The specimen is 
too pulpy for satisfactory section. 
1 Amiel. Chetop., p. 57. 
