REPORT ON THE ANNELIDA. 
427 
Phyllocomus, Grube. 
Phyllocomus cr'ocea, Grube (PI. XLVII. fig. 11 ; PI. XXVIa. fig. 25 ; PI. XXXVIIa. 
fig. 6). 
Phyllocomus crocea, Grube, Monatsber. d. k. preuss. Akad. d. Wis?. Berlin, August 1877, p. 543. 
Habitat. — Dredged at Station 151 (off Heard Island), February 7, 1874; 
lat. 52° 59' S., long. 73° 33' E. ; depth, 75 fathoms; surface temperature, 36°‘2; sea- 
bottom, volcanic mud. 
A fragment of the anterior region of a comparatively large form, the greatest 
diameter, which is immediately behind the head, being 4 mm., and the length about 
10 mm. Grube’s specimen was larger and more complete, measuring 83 mm. in length 
by 7 mm. in breadth. 
The snout is flattened and broadly spathulate anteriorly, the margin being some- 
what rectangular. A shallow groove occurs in the middle line, with a slight elevation 
on each side. Just where the fold of the buccal segment runs forward to meet the 
margin of the flattened region of the snout a well-marked slit occurs on each side, and 
may be connected with a sensory, or, as Grube says, a secretory function. No tentacles 
are present in the species, and this is exceptional in the family. The next segment 
bears dorsally the marks of four branchial processes on each side, the two inner occurring 
in a transverse line, while the two outer are placed in a line running obliquely outward 
and forward from the foregoing. In the centre of the bases of these organs are certain 
small chitinous masses of an elongate-ovoid shape, resembling undeveloped spines. No 
trace of paleolse is visible. Grube describes the branchiee as broadly lanceolate, the 
posterior with long tapering tips, which extend considerably beyond the frontal 
margin. 
There are fifteen pairs of bristle-bundles on each side, and their structure agrees with 
that usually met with in the family, viz., each possesses a stoutish shaft, with a well- 
marked terminal wing. The shorter series in each tuft is also stout and furnished with 
wings. The bristle-papillae are less prominent than the larger hook-pads beneath, so 
that both are seen from the dorsum. 
The hooks (PI. XXVIa. fig. 25) possess five well-defined teeth, the middle being that 
most developed. The inferior fang has beneath it a small mucro, so that there is a 
double curve between it and the terminal process. The body of the hook is marked by 
bold transverse lines which pass into the bases of the three middle teeth. 
The greyish mud in the alimentary canal is very rich in Diatoms, and there are also 
a few Eadiolarians and other organisms. 
A glance at the body- wall (PI. XXXVIIa. fig. 6) in section shows that the t}q)e 
differs from that of any other member of the group. The cuticular and hypodermic 
