with certainty any cement glands. I may, however,
here mention, that I found in the lower half of the peduncle, numerous,
yellowish, transparent, excessively minute, pyramidal bodies, with
step-formed sides; of these two or three often cohered by their bases
like crystals; I have never seen anything like these in other
Cirripedes, but it has occurred to me that they may possibly be
connected with the formation of the cement: for in the last larval
condition of Lepas, the cement-ducts run up to the gut-formed ovaria,
filled at this period with yellowish, grape-like, cellular masses,
without the intervention of cement glands, and I can imagine that
similar masses, not being developed into functional ovaria, might give
rise to the yellow pyramidal bodies.

_Mouth._--The mouth is well developed; it is represented as seen
vertically from above, in Pl. V, fig. 2, magnified about 60 times; the
positions of the cirri and the outline of the thorax are accurately
shown by dotted lines; a lateral view is given in fig. 1. In the
specimen figured, the longitudinal diameter of the mouth, including the
labrum, was 5/400th of an inch. The muscles of the several trophi have
transverse striae, and are the strongest and most conspicuous of any in
the body. The labrum is largely bullate, with its summit slightly
concave; the trophi are arranged in a remarkable manner, in a
semicircular line, so as to be opposed to the labrum rather than to each
other: there are no teeth or spines on the crest of the labrum, which
overhangs the oesophageal cavity.

The _Palpi_ (fig. 2 _b_ and fig. 3) are very small, dark purple, bluntly
pointed, with a few small bristles at the point; they do not extend
beyond the knob at each corner of the labrum, which is here present, as
in all other Lepadidae; they are much smaller than in the female, though
of a similar shape, and consequently, their points are much further
apart: within their bases, the lateral muscles of the mandibles are, as
usual, attached; they are represented in fig. 3, as seen from the
inside, with the eye on a level with the concave summit of the labrum.
The rudimentary condition of the palpi is connected, as remarked under
the _Anelasma squalicola_, with the absence of efficient cirri.

The _Mandibles_ (fig. 7) are well developed; they so closely resemble
those of the female that it is superfluous to describe them: they are,
however, smoother, without any trace of the teeth being pectinated