" breadth, in broadest part 6/20000

The disc resembles a broad, rounded hoof, very little longer than broad,
and narrowed in at the heel; the apex is not at all pointed, and bears
some minute and thin spines. There is one large spine on the under side
of the disc; and another on the basal segment, on the outside, in the
usual position. The ultimate segment is long and thin; it has a notch on
the inner side (the segment supposed to be stretched forward), bearing
two or three long flexuous spines; and there are three or four other
spines on the summit: altogether there is a close resemblance with the
antennae in Scalpellum, excepting that the hoof-like disc is not here
pointed.

_Colours._--Valves internally tinted, in parts, grey; peduncle, brown;
corium of sack, purplish-brown, of peduncle, rich coppery brown; cirri,
banded dorsally, and with the front surfaces of the segments,
purplish-brown. Edge of the orifice of sack, fine crimson red. The
specimen here described had been dried for a few weeks, and was then
moistened.

_Dimensions._--The largest specimen which I have seen, in Mr. Cuming's
collection, had a capitulum 1 and 4/10ths of an inch long; a fine
specimen, from Teneriffe, was 9/10ths in length. In a specimen with a
capitulum 1/20th of an inch long, and about the same in breadth, there
were eighteen valves; so that, besides the principal valves, five pair
of latera, the sub-carina, and sub-rostrum, were already developed, and
on the upper part of the peduncle, there were many calcareous scales.

_Filamentary Appendages._--The prosoma is well-developed, with thirteen
or fourteen pair of short, blunt filaments, placed close together in two
longitudinal rows; those nearest the thorax are the longest; outside
this double row, on each side, there is a row of papillae, indicating a
tendency to the formation of two other rows of filaments. There is a
pair of longer filaments, one on each side of the mouth, pointing
upwards, and thinly clothed with long spines; at the bases of the first
pair of cirri there is a second pair of filaments, shorter and bearing a
few minute spines. The bottom of the sack is studded with small rounded
papillae, with roughened summits.

_Mouth_, not placed very far from the adductor muscle.

_Labrum_, highly bullate, equalling, in its longitudinal diameter, the
rest of the mouth; upper part square, not overhanging the lower part;
there are some small teeth on t