in the British Museum, from the Coast
of China, 2.3 inches across the capitulum, and 1.5 in length, with the
valves surprisingly thick. The relative width and length of the
capitulum varies. The sack (in specimens long kept in spirits) is dirty
purple, and exteriorly between the scuta, dark purple. The cirri,
trophi, penis, caudal appendages, three posterior segments of the
thorax, and the abdominal surface are dark-brownish purple.

_Body._--Thorax remarkably compressed and carinated; prosoma pretty well
developed. Extending from the base of the second cirrus, to nearly a
central line on the thorax, there is on each side a rounded ridge: there
is a second transverse ridge, running from the base of the first cirrus
to near the adductor scutorum muscle: these ridges seem formed merely to
allow of the larger development of the testes.

_Mouth._--Labrum highly bullate; crest without any teeth, but with a few
minute hairs. The inner fold of the labrum forming the supra-oesophageal
cavity, is thickened, and shows a trace of a central line of junction,
as in Sessile Cirripedes.

_Palpi_ (Pl. X, fig. 7), small; of a singular club-like shape, owing to
the convexity of the outer margin; exterior spines long, all doubly
serrated.

_Mandibles_ (Pl. X. fig. 1), with five teeth, of which the second is
very small; inferior angle coarsely pectinated.

_Maxillae_ (fig. 14), with a deep narrow notch (bearing some fine spines)
beneath the two upper great spines, which stand on a prominence; edge
straight, bearing fourteen or fifteen pairs of spines: on the inferior
angle there is an obscure tuft of shorter and finer spines: apodeme
long, sinuous, and slender.

_Outer Maxillae_ (fig. 17), with the inner margin divided by a deep notch
into two lobes, of which the upper one is rather short; both are clothed
with a compact row of short bristles; exterior margin with longer
bristles.

_Olfactory Orifices_, large and prominent to an unusual degree.

_Cirri_, moderately long and curled; the four posterior pair are alike;
each segment has its anterior face somewhat protuberant, and bears six
pairs of long spines, with a rather large, narrow tuft of intermediate
spines, some of which are finely and doubly serrated. The dorsal tufts
consist of short, thick spines, with some fine longer ones. The first
cirrus is seated near the second; its rami are slightly unequal in
length; lower segments paved with bristles; one ramus is thicker than
t