506 
THE VOYAGE OF H.M.S. CHALLENGER. 
gently from tlie crown outward and downward to the base. The posterior basal process 
is considerably less in the posterior hooks, which also show a proportionally longer neck 
and shorter body. 
The food of this form is very rich in sponge- spicules, with a few Diatoms, minute 
Glohigerince, bristles of Annelids, and other debris. 
The short tube is composed of a tough chitinous secretion surrounded by mud 
anteriorly and a few fragments of shells and other structures posteriorly. It is more 
brittle anteriorly than posteriorly. Microscopically the greyish mud exhibits coarse 
sand-particles, numerous sponge-spicules, a few Diatoms and gritty masses of mud and 
sand, probably arenaceous Foraminifera. 
The structure of the body- wall appears to be nearly typical, though the rudimentary 
condition of the circular muscular coat mferiorly causes a divergence in the region below 
the nerve-area, which is remarkable for its great extent, the transverse diameter being 
only a little shorter than that of the ventral muscles. 
I have doubtfully referred this species to Schmarda’s Sahella violacea, though he 
does not mention the dorsal appendages of the branchiae, which also are few in his form. 
It is possible that the want of definition in Schmarda’s description may mislead. It 
would require a re-examination of the type, however, to set the matter at rest. 
Dasychone ca^oensis, n. s|). (PL LIV. fig. 1 ; PI. XXXIa. figs. 9-11 ; PL XXXIXa. 
fig. 8). 
Habitat . — Dredged at Station 142 (off the Cape of Good Hope), December 18, 1873 ; 
lat. 35° 4' S., long. 18° 37' E.; depth, 150 fathoms; bottom temperature 47°’0, surface 
temperature 6 5° ’5 ; sea-bottom, green sand. 
The length of the body is about 28 mm., and of the branchiae about 18 mm. The 
diameter of the body anteriorly at its widest part is 4 ‘5 mm. 
The body is somewhat rounded dorsally, this surface being marked only by the 
cejDlialic groove in front, the termination of the furrow from the ventral surface on the 
right side anteriorly, and by the transverse lines of the segments. Ventrally the 
median groove passes forward to the sulcus behind the first abdominal segment, and 
then is directed obliquely to the right (left as viewed from the ventral surface), cuttiug 
off a small area of the latter on its way to the lateral groove. The general colour of 
the body is ferruginous, with a deep brownish speck below the bristle-tufts, at the 
commencement of the uncinigerous rows, in the thoracic region, and a similar pigment- 
speck at the end of each hook-row in the same division. Posteriorly the dark pigment- 
speck is above each bristle-tuft. 
