188 
THE VOYAGE OF H.M.S. CHALLENGEE. 
a short distance below. In the superior bristles, however, the latter extends beyond the 
lower hook or knob (PI. XVa. figs. 6, 7, the former representing one of the longer 
superior, the latter one of the shorter forms). The ventral cirrus is slender and filiform, 
and shows no basal segment. 
There is a prominent central longitudinal ridge below the snout, just above the open- 
ing of the mouth. It ends in a thin edge posteriorly, and joins the internal buccal folds. 
The interior of the proboscis is smooth, and shows traces of dark pigment on the surface. 
The alimentary canal is empty. 
This form seems to diverge from any hitherto described, both generically and specific- 
ally. It pertains to that group of the Hesionidse^ of Claparede in which the foot is 
biramous, the upper branch having simple hair-like bristles ; but it differs from the 
known genera Leocrates, Kinberg,^ Tyrrhena, Claparede,® and Lamproderma, Grube,^ in 
having no median tentacle, and in other particulars. So far as could be observed in the 
preparation, no dental armature occurred in the proboscis, but as the specimen is in an 
indifferent condition, too much reliance need not be placed on this point. The structure 
of the tips of the ventral bristles is diagnostic. 
Salvatoria,^ n. gen. 
Body somewhat elongated. The four eyes almost in a transverse line. A single 
median and a lateral tentacle on each side. One pair of tentacular cirri. All these 
organs have enlarged bases and articulated tips. The biramous foot has the dorsal 
division represented by a single simple bristle. In the ventral branch the terminal pieces 
of the bristles are sabre-shaped with simple hooked tips. 
Salvatoria kerguelensis, n. sp. (PI. XXX. fig. 4 ; PI. XXXIII. fig. 1 ; PI. XVa. 
figs. 11, 12). 
Habitat . — Dredged at Station 149k (off Christmas Harbour, Kerguelen), January 29, 
1874; depth, from 45 to 120 fathoms; sea-bottom, volcanic mud. It was picked out 
from the debris of Latmonice (in spirit). 
A minute species about 4 mm. long and about half a mm. broad. 
The body is slightly tapered anteriorly (PL XXX. fig. 4), and considerably more so 
toward the tail. The head is bluntly triangular, and furnished with four conspicuous 
brownish eyes, which are arranged near each other toward the posterior part of the head, 
1 Annel. Ch4top., p. 228. ^ Ofmrsigt k. Vetensk.-Akad. Fdrhandl., 1865, No. 4, p. 244. 
3 Annel. Ctetop., p. 227, pi. xviii. fig. 3. ^ Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, 1877, p. 52. 
® Named after the College of St. Salvator, St. Andrews. 
