basal margin straight. The inner and growing surface is four
fifths of the entire length of the valve. In half-grown specimens the
apex projects a little outwards.

_Rostrum_, small, much curled inwards; the basal margin is much hollowed
out; the inner surface is broadly triangular, more than twice as wide as
high, and about one fourth of the entire length of the valve. The
remaining valves, about 26 in number, do not correspond on the opposite
sides of the same individual, they are exceedingly small, with the
sub-carina, sub-rostrum, and three pairs of latera a trifle larger than
the lower latera, which are generally arranged in two whorls. In shape
all the latera are nearly alike; they consist of flattened styles, with
their inner surfaces transversely oval, and more or less elongated, the
larger ones being most elongated.

_Peduncle_, broad, barely as long as the capitulum. The calcareous
scales are irregularly shaped, minute, elongated and pointed, placed in
separate transverse rows, and crowded together in each row. Only the
scales in the uppermost row grow regularly; but some of the lower scales
continue to be added to irregularly, and hence are the largest. On the
other hand, the lower part of the peduncle, from the first formed scales
having been worn away, is often quite naked. From this cause, and from
the continued and irregular growth of some of the lower scales, the rows
in this part of the peduncle, generally become irregular. The surface of
attachment is broad.

In a half-grown specimen, with a capitulum only 3/10ths of an inch long,
all the lower valves were considerably larger in proportion to the
scuta, terga, and carina, than in full-grown individuals.

_Size and Colours._--Length of capitulum in the largest specimen,
7/10ths of an inch; breadth, slightly exceeding the length. Colours
after having been long in spirits--upper part of sack, thorax, pedicels
of cirri, and penis, clouded with fine purple; cirri banded with the
same; exterior convex surface of the outer and inner maxillae and palpi
dark purple; prosoma yellow. The membrane of the peduncle and of the
capitulum is dirty yellow, with bands of purple between some of the
valves.

_Filamentary Appendages_, none. Ovigerous fraena placed near the middle
of the basal margin of the scuta; small, semi-oval, with an elliptical
ring of bead-like glands; glands seated on long footstalks.

_Mouth._--Labrum far produced towards the adductor muscle;