n.
The peduncle does not seem to have been attached in any definite
position to the horny coralline, as is the case with _S. vulgare_.

Length of capitulum in the largest specimen .2 of an inch.

The _Mouth_ is directed towards the ventral surface of the thorax. The
_Labrum_ is far removed from the adductor muscle, with the upper part
forming an overhanging projection; I believe there are some very minute
bead-like teeth on the crest. _Palpi_, small, narrow, thinly clothed
with bristles.

_Mandibles_, with three teeth, of which the first is distant from the
second; inferior angle not much acuminated, pectinated on both edges.

_Maxillae_, small, narrow, produced, without any notch, with two large
upper spines, of which one is much thicker than the other; on the convex
upper margin there are some minute tufts of very small hairs.

_Outer Maxillae_, with few bristles, arranged in a continuous line on the
anterior surface; on the external surface there is a tuft of long
bristles. Olfactory orifices situated laterally, forming two flattened,
tubular projections.

_Cirri._--First pair placed not far from the second; the three posterior
pair not very long, with their segments elongated, not protuberant,
bearing four pair of non-serrated spines, with a single short bristle
between each pair; dorsal tufts small, with one spine longer than the
others. First cirrus rather short, segments not very broad; second
cirrus with the rami nearly equal in length, anterior ramus rather
thicker than the posterior ramus, with three longitudinal rows of
spines.

_Caudal Appendages._--These are minute, rather broad, not half as long
as the lower segments of the pedicels of the sixth cirrus, with four
very long spines at the tip.

_Penis._--There is no trace of a probosciformed penis in the four
specimens examined; and as this organ is present in every ordinary
cirripede, with the exception of _Ibla Cumingii_ which we know to be
exclusively female, so we may infer with some confidence that the form
here described is female, although it is impossible in specimens once
dried to demonstrate the absence of the vesiculae seminales and testes.

_Affinities._--This is a very distinct species; it is, however, much
more nearly related to _S. rutilum_, than to any other species; and next
to this, to _S. vulgare_; from this latter species it chiefly differs in
the large scales of the peduncle, in the scuta not being added to at
their upper ends