unusual size, but placed rather far apart
from each other; these do not extend to the very base of the peduncle,
and at the upper end they curve inwards, almost to the middle of the
under side of the diaphragm, separating the peduncle and capitulum.
Outside these longitudinal muscles, there are delicate transverse ones,
but apparently there are no oblique muscles in the upper part of the
peduncle, as in other Lepadidae; near the bottom, the transverse muscles
form a thicker layer with many of the bundles running in oblique lines.

_Mouth._--uLoven has not described this part quite accurately, owing to
his not having used high enough magnifying powers. He states that the
trophi are soft and functionless, which is far from the case. The whole
mouth (fig. 2 _d_), is unusually small; it is, to a certain extent,
probosciformed, and being curved a little downwards, projects slightly
over the adductor muscle, to which it is closely placed. The labrum does
not project more beyond the general surface of the body, than in many
other Cirripedes, but the probosciformed structure is caused by the
elongation of the surface fronting the thorax. The summit of the mouth
stands above the level of the top of the pedicels of the first pair of
cirri. The labrum is slightly hollowed out in the middle of its upper
margin; it can scarcely be called bullate, in which it differs from all
other Lepadidae; on the other hand, the outer and inner folds of the
labrum are not so close together as in Balanus. On each upper corner,
there is, as usual, a small rounded prominence, close to which there is
a second slight, rounded, spineless swelling; these latter represent the
quite rudimentary _Palpi_.

The _Mandibles_ (figs. 4, 5) are more highly developed than the other
trophi; they are, however, very minute, the toothed edge being only
about 16/1000th of an inch in length, measured in its longest direction;
the edge is unusually thick, with the teeth placed rather on one side;
this organ, when viewed on the labrum side (fig. 5), shows two large
teeth placed low down, with the inferior angle pectinated and broadly
truncated; but when viewed on the other or maxillae side (fig. 4),
several large and small teeth, placed alternately and irregularly in
pairs, are seen extending along the whole edge. The mandibles are
furnished, as usual, with three principal sets of muscles attached to
the basal fold of the mouth.

The _Maxillae_ (fig. 7) are still smalle