374 
THE VOYAGE OF H.M.S. CHALLENGER. 
The hyaline cuticle invests the body with an almost gelatinous coating. It is abund- 
antly studded with granules, and numerous elongated glands, which are filled with minute 
cells and granules. The glands probably furnish a secretion, as in others of the grou}>. 
The muscular body -wall beneath the latter is tinted of a brownish hue. 
The mouth leads into a dark brownish thickly walled pharynx, which in the preparation is 
somewhat moniliform. The latter terminates in a firm, white, and nearly cylindrical region, 
somewhat narrowed posteriorly, where it merges into a longitudinally furrowed glandular 
part continuous with the intestinal canal. The latter shows by and by a change in colour. 
The nervous system (PI. XLV. fig. 2) is beautifully shown on the ventral surface as a 
double cord, with two ganglia placed antero-posteriorly in each segment, the larger being 
in front and the smaller behind. 
The condition of the specimens is unfortunately unfavourable for the examination 
of their minute anatomy, so that this must for the present be postponed. Sufficient was 
seen, however, to indicate that this will prove a most interesting and productive inquiry. 
It is remarkable to find this peculiar type stretching over so vast an area in mid-ocean, 
and at such a depth. 
Family Chaitopterida:. 
Representatives of this family are present in most collections, though none occur in 
the Philippine series of Prof. G-rube. The latter mentions two in his account of the 
Annelids of the “ Gazelle”; while Kinberg and Schmarda each describe the same number. 
It is noteworthy that no example comes from the Strait of Magellan, from v/hich two 
species have already been procured, in addition to an undescribed ringed tube in the 
British Museum from the same locality. 
Both forms found by the Challenger come from comparatively shallow water, for little 
weight can at present be placed on the empty tubes dredged in deep water off the 
American coast. ' SpiochcBtopterus typicus of Sars, however, was obtained at a depth of 
557 fathoms in the “Porcupine,” and there is no reason why this and others should not 
descend to a much greater depth. 
The distribution of the family is extensive, since it ranges from the extreme north 
to the extreme south. 
Phyllochcetopterus, Grube. 
Phyllochcetopterus claparedii, n. sp. (PI. XLV. figs. 9, 10, 10a, 11; PI. XLVI. fig. 1; 
PI. XXIVa. figs. 1-5). 
Habitat. — Dredged in considerable abundance from the two following Stations ; — 
Station 233 (off Kobe, Japan), May 17, 1875; lat. 34° 39' N., long. 135° 14' E. ; 
depth, 8 fathoms; surface temperature, 62° ‘3 ; sea-bottom, mud. 
