, and
with the inferior point smaller: measured in their longer direction,
they are 7/2000th of an inch in length, and, therefore, a little less
than one third of the size of those of the female. These organs have the
usual muscles well developed, and the usual articulations.

The _Maxillae_ (fig. 8) have a rather rudimentary appearance; yet they
have the same size relatively to the mandibles, as in the female, the
spinose edge being 3/2000ths of an inch in length. These organs
resemble, to a certain extent, those of the female, differing from them
in being less prominent,--in the outline being more rounded, with the
notches even less distinct,--and in the spines being fewer. The apodeme
is short and broad.

The _Outer Maxillae_ (fig. 6) are pointed, with a small tuft of bristles
at the apex; they are much less hairy than in the female, but have
nearly the same unusual shape. Outside their bases, and between them and
the inner maxillae, the two well-developed, tubular, flattened,
square-topped, olfactory orifices, project in exactly the same
remarkable position as in the female; these are not represented in fig.
2, though sometimes they can be very distinctly seen, when the mouth is
viewed from vertically above.

_Thorax and Cirri._--The thorax is in a rudimentary condition: I did not
observe the usual articulations. The whole, as seen from vertically
above, is of small size, compared with the mouth; the outline is
accurately shown by dotted lines in Tab. 5, fig. 2, together with the
positions of the two pair of cirri, the caudal appendages, and anus. The
posterior end of the thorax does not rise to the level of the summit of
the mouth; and the thorax seems of no service, excepting perhaps as a
sort of outer lip to protect the mouth. The cirri are in an extreme
state of abortion, and evidently functionless; they are lined with
purplish corium, without the vestige of a muscle; they are usually
distorted and bent in different directions; they vary in size, and even
those on opposite sides of the same individual, sometimes do not
correspond, and do not arise from exactly corresponding points of the
thorax. There are always two pair of cirri, which, as I conclude from
the position of the excretory orifices, answer to the fifth and sixth
pair in other Cirripedes. Each cirrus (fig. 4) usually carries only one
ramus, placed on a large basal segment, evidently corresponding to the
pedicel of a normal cirrus. The posterior ar