372 
THE VOYAGE OF H.M.S. CHALLENGER. 
The length of the specimen is 18 mm., and the breadth at its widest part in front 
nearly 4 mm. 
The body is somewhat fusiform, tapering toward either extremity, but more especially 
toward the posterior. It is less convex ventrally than dorsally. The skin is densely 
covered with long acute papillae, which in the Challenger specimen are coated with fine 
sand, so that the body has a very different appearance from that in which the j^apillae are 
bare. The segment-junctions are devoid of these papillae, and thus are very clearly marked. 
The ventral surface is studded with smaller papillae of the same kind. Twenty- two 
segments are present in the specimen, which is incomplete. 
The snout is bluntly rounded, and the tentacles and branchiae are retracted. The 
oral region is indicated by a triradiate slit. 
The anterior bristles are slender and comparatively short, of a pale golden hue and 
highly lustrous, as usual in the group (PI. XXIIIa. fig. 9). So far as can be observed, 
their transverse bars are tolerably wide. The dorsal bristles, again, are moderately 
elongate, and have a similar structure to the foregoing. 
The ventral hooks are rather elongate, with pale tapering filiform tips, and a series of 
somewhat close striae (PI. XXIIIa. fig. 10). In many of the posterior hooks the tips are 
even more filiform. They resemble in this respect the condition observed in Trophonia 
rugosa and Trophonia arctica, Hansen.^ 
The papillae of the feet are elongate, almost filiform processes, having an external 
cuticular investment and an internal axis, ending in an expanded basal region, composed 
of hypoderm. 
In transverse section the great thickness of the cuticle is noteworthy, and it is 
densely covered with minute sand-grains, which likewise envelop the slender papillae, so 
that, as a rule, little more than the tips of the longest are free. The hypoderm is 
comparatively thin, except at the base of the papillae. The circular and longitudinal 
muscular layers are also thin, a feature probably in relation to the great thickness 
of the cuticular coat. 
This Annelid does not appear to eorrespond with any of the American forms described 
l)y Stimpson or Verrill. 
Bushiella,^ n. gen. 
Bushiella ahyssorum, n. sp. (PI. XLV. figs. 1, 2; PI. XXIIIa. figs. 15-18). 
Habitat. — Fragments of this remarkable form were trawled at the following Stations : — 
Station 101 (off Sierra Leone, on the African Coast), August 19, 1873; lat. 5° 48' N., 
long. 14° 20' W. ; depth, 2500 fathoms ; bottom temperature 36°‘4, surface temperature 
79°'2 ; sea- bottom, blue mud. 
^ Op. cit., pp. 38 and 39, Tab. vii. figs. 12 and 20. 
2 Named after G. Busk, Escp, F.B.S., one of the most devoted and most exact of living zoologists. 
