CHONE DUNERI. 295 
of minute crustacea, amidst muddy sand. A large and firm glandular body is attached to the 
intestine, and above the intestine lies the dorsal blood-vessel, which has in the preparation a 
brownish, barred aspect. 
The anterior half of the intestine is of a pale brownish hue and somewhat firm, as if 
chitinous, and in minute structure is finely striated transversely, and hence the readiness 
with which it ruptures. Few muscular fibres occur in the anterior region of the gut, 
but at the point where it becomes moniliform a layer of muscular fibres lies beneath the 
firm coat, which becomes thin and translucent posteriorly, whilst the muscular fibres increase 
in bulk and power. A complex reticulation of blood-vessels covers the wall of the canal 
anteriorly. Strong fibres from the body-wall cross the canal, but are not attached to it. 
The intestine is coated throughout with the brownish digestive glands, which are deeply 
tinged with yellow pigment. They cease within a quarter of an inch of the vent. 
Reproduction.—Small ova were found in the coelomic space in October. 
Tube.—In one a tough tube of secretion of a brownish or ochreous hue occurred 
anteriorly. The pigment was amorphous. The posterior part, again, was coated with 
sand-particles, a few minute fragments of shells and spines of Spatangus. In some the 
tube is of a tough gelatinous nature rendered opaque by sand-grains, the translucent 
portions being ochreous. A small variety in tough semitranslucent tubes comes from 
Finmark (A.M.N.). 
M. Sars (1861) describes Chone Kréyeri as a new species—measuring about 40 mm. in 
length. It has fewer branchiz (eight to ten), but this and other divergences may be due to 
age, the example perhaps representing a young form. 
Prof. Fauvel (19138) differs from the conclusions stated in the foregoing pages, and 
after examination of specimens from the Kara Sea, Jan Meyen, Spitzbergen and other 
regions, groups all under Chone imfundibuliformis, Kroyer. He does not, however, differ- 
entiate Chone Duneri, and, as indicated in the text and figures, it has been thought best 
to adhere to views published in the ‘Annals of Natural History’ in January, 1916. An 
interesting comparison of the bristles and hooks of Prof. Fauvel’s Chone infundibuliformis, 
with text-figures, is given in the ‘ Bull. Mus. Hist. Nat.’ 1913, No. 2, p. 91. 
2. CHONE DuneEri, Malmgren, SG 7en Plate XOXoXe figs. 3—3c—bristle and hooks. 
Specific Characters.—Cephalic collar resembles that of C. wmfundibuliformis, sloping 
downward and forward to an even and continuous rim ventrally. Branchial filaments 
six to twenty-two in number, on each side, comparatively long, with long, slender, terminal 
processes, which taper to a delicate tip and are winged; united by membrane throughout the 
greater part of their length. Pinne long, only a few shorter occurring near the commence- 
ment of the terminal process. Body smaller than in C. infundibuliformas or C. Fauveli ; 
flattened and grooved anteriorly on the dorsum, and having a median groove ventrally from 
the ninth scute backward to the anus, with its papilla; segments about fifty. Anterior 
bristles (eight pairs) in two groups, an upper with longer shafts and tapering, winged tips, 
and a lower series of spatulate forms with a short process at the tip. The posterior bristles 
have the tips much elongated. The anterior hooks, though smaller, resemble those of C. 
