REPORT ON THE ANNELIDA. 
]03 
terminates on each side anteriorly in an elongated bluntly conical process bearing at its 
tip an organ like an antenna, the surface of which has clavate cilia. The brownish 
terminal appendage is slightly enlarged at the base and tapers to a filiform tip. A 
cicatrix appeared to be present on each side beneath, and to this a palpus may have been 
attached. Such traces of the dorsal and tentacular cirri as remain show that these organs 
also had sparsely distributed clavate ciha. The ventral cirrus is long, tapering, and 
apparently smooth. It is peculiar in having a number of rounded granular cells 
internally. All the scales are absent. 
The dorsal division of the foot bears two series (which, however, run into one 
another) of translucent bristles with well-developed spinous rows and boldly marked 
longitudinal striae. Those next the body are shorter, broader, more curved, and more 
abruptly pointed (PI. Xa. fig. 3) ; moreover, the” longitudinal striae are crossed by close 
transverse striae, which thus 'make the hispid region minutely checkered. The outer 
series (next the ventral) are straighter, longer, and proportionally more slender than the 
former, and their spinous rows are longer. 
The ventral group has superiorly slender bristles with elongated spinous regions, and 
terminated by long peculiarly curved smooth tips, which are slightly bifid. Toward the 
middle of the series the structure of the latter is better shown (PI. Xa. fig. 4). The 
spinous rows end superiorly at a well-marked process, and the curve of the long smooth 
region below the bifid tip is characteristic. The inferior setigerous lobe is produced 
into a long conical process, with the spine at the apex. 
Theel ^ describes a new genus [Bylgia) from the Kara Sea in which the small 
antennae are the only organs on the anterior margin of the head, but the tentacle is 
entirely absent, and the form of the head and the structure of the bristles diverge 
much from the foregoing. The nerve-cords, as in similar small forms, are proportionally 
large and rounded. 
Scdlisetosus, n. gen. 
Scalisetosus ceramensis, n. sp. (PI. Xa. figs. 13, 14). 
Habitat . — Trawled at Station 194a (south of the island of Ceram), September 29, 
1874; lat. 4° 31' S., long. 129° 57' 20" E. ; depth, 360 fathoms; surface temperature, 
8 2° ’5 ; volcanic mud. 
The single specimen is devoid of scales, and seems to have been partially dried. 
Length 16 mm. and breadth about 6 mm. An imperfect description only can be 
attempted. 
^ Anndl. Polychetes d. mers. d. la Nouvelle-Zemble, K. Svenslc. Vetenslc, Akad. Handl,, Bd. xvi., No. 3, Stockholm, 
1879, p. 20, pi. i. fig. 13, &c. 
