REPORT ON THE ANNELIDA. 
497 
processes and the ventral scutes. The hooks (PI. XXXa. fig. 15) present a strongly 
curved neck, while the crown is but slightly developed, only two or three teeth Ijeing 
visible in profile, as a rule, above the great fang. The dorsal line is inflected, and the 
basal region has only a rudimentary posterior process. .The anterior projection or prow, 
on the other hand, is largely developed. The teeth on the crown are better developed 
on the posterior hooks, and the striae on the body are more distinct. 
The intestine had only a little granular mud with a few sponge-spicules and fragments 
of a thin shelly lamina that had been perforated by a minute boring form. In one 
specimen the contents of the intestine were coloured dull orange. 
In transverse section of the anterior third of the body- wall the great extension of the 
longitudinal dorsal muscles is apparent. The longitudinal ventral are also somewhat 
wider proportionally than in Sabella. The hypoderm is comparatively thin and deeply 
coloured with pigment. The basement-tissue attains great development on the ventral 
surface, not abruptly, but by a gentle curve. A median fissure bounded by pigment also 
exists. Considerable differences in appearance occur in this region according to the line 
of section. Where the instrument passes through the ganglia, the circular muscular coat 
makes a narrow decussation in the middle line over the summit of the fissure, and a broad 
area of pigment extends from the latter on each side '(PI. XXXVIIIa. fig. 5); whereas 
when the section divides the interganglionic region, a much wider decussation is found, 
and the pigment at the fissure is limited (PI. XXXVIIIa. fig. 6). Minute blood-vessels are 
present in the thick ventral hypoderm. The ventral blood-vessel is elevated in the alimen- 
tary band above the nerve-area. The perivisceral chamber is filled with minute ova. 
Dasychone picta, n. sp. (PI. XXXa. figs. 16-18 ; PI. XXXIXa. fig. 3). 
Habitat . — Dredged at Station 233 a (off Kobe, Japan), May 19, 1875 ; lat. 34° 38' N., 
long. 135° 1' E. ; depth, 50 fathoms; surface temperature, 62°'6 ; sea-bottom, sand. 
This form, which is incomplete, and could hardly be removed from its tube, to which 
it is glued by its secretion, measures 33 mm. in length inclusive of the branchiae (8 mm.). 
The diameter anteriorly is about 1'5 mm. 
So closely do the secretion and mud adhere to the body that serious ruptures 
ensue in most cases when an attempt is made to remove them. The number of the 
anterior segments and other points are therefore undetermined. The precise shape of 
the cephalic collar could not be ascertained. The body is pale, tapers from before 
backward, and has a minute reddish spot at each bristle-bundle. 
The branchiae appear to be about eight on each side, and are beautifully streaked 
with reddish-brown and orange, the blotches in each case invading the adjoining pinnae, 
(ZOOL. CHALL. EXP.— PART XXXIV. 1885.) LI 63 
