ly clothed with spines, than the
posterior ramus, but shorter than it by three or four segments; the
spines not forming a very thick brush on the anterior ramus. Both rami
of third cirrus with a longitudinal row of minute spines, parallel to
the main pairs. Between the bases of the pedicels of the first pair of
cirri, there are two closely approximate, conical flattened
protuberances, like the single one to be described in Ibla.

_Caudal Appendages_, about one third of the length of the pedicel of the
sixth cirrus, with some moderately long and strong spines at the end,
and down the whole outer sides.

_Ova_, much pointed. _Penis_, hairy.

_Size._--Capitulum in largest specimens half an inch long.

2. PAECILASMA AURANTIA. Pl. II, Fig. 2.

_P. valvis 5; carinae basi truncata: scutis ovatis, margine basali
perbrevi, dentibus parvis, internis, umbonalibus instructo: tergorum
acumine basali peroblique truncato._

Valves 5; carina with a truncated base; scuta oval, with the basal
margin very short, furnished with small internal umbonal teeth; terga,
with the basal point very obliquely truncated.

Maxillae with fine spines in the notch under the three great upper
spines; caudal appendages with scattered bristles on their summits, and
along only the upper part of their outer margins.

Madeira; found by the Rev. R. T. Lowe, attached to the rare
_Homola Cuvierii_, probably a deep-water crab. British Museum.

_General Appearance._--This species so closely resembles _P. Kaempferi_,
that it is superfluous to describe it in detail; and I will indicate
only the points of difference. When the valves have been well preserved,
they are of fine pale orange colour, and hence the name above given,
which was proposed by the Rev. R. T. Lowe.

_Scuta_, with the internal umbonal teeth small; basal internal marginal
rim very prominent, furrowed within; basal margin short, (only equalling
half the length of terga), owing to the great curvature of the lower
part of the carino-tergal margin; hence, the outline of the scuta is
almost pointed oval. I saw no appearance of inequality in the two sides.

_Terga_, rather smaller in proportion to the scuta, than in _P.
Kaempferi_, with the basal end very obliquely truncated, so as to appear
at first simply pointed, not parallel to the occludent margin; apex
considerably more pointed and produced than in the foregoing species.

_Carina_, almost of equal narrowness throughout, barely