elow the basal points of the terga.

The _Rostrum_ is shorter, and internally more concave than the carina: I
believe it projects more abruptly outwards than is represented in the
figure.

The _Peduncle_ commences some little way below the scuta: it is narrow
and very short: it is finely villose: it is lined by delicate transverse
striae-less muscles, within which there are the usual stronger,
longitudinal muscles. The base is flat and truncated. I examined, and
carefully compared, the prehensile antennae with those of the
hermaphrodite, and found every part and every measurement the same. The
full importance of this identity will hereafter be more fully insisted
on. The antennae are represented of their proper proportional size in
fig. 3.

_Mouth._--The labrum, as in the hermaphrodite, is highly bullate, and
far removed from the adductor scutorum muscle. The _Palpi_ are small and
triangular, with their blunt apices clothed with a very few scattered
bristles.

_Mandibles_, with only three teeth, and the lower angle minute, slightly
pectinated; the first tooth is distant from the second, and larger than
it. Width of the whole organ, .0021 of an inch.

_Maxillae_, bearing only a few spines, furnished with a long apodeme;
beneath the upper large pair there is a notch, under which there are two
spines of considerable size and a small tuft of fine bristles; width
.001 of an inch, and therefore only 1/16th of the size of the same organ
in the hermaphrodite: the relative sizes of the maxillae and mandibles
are the same in the male and hermaphrodite.

_Outer Maxillae_ blunt, triangular, with a few thinly-scattered bristles
on the inner face; those on the outside being longer.

_Cirri._--The First pair is far removed from the second; the rami are
very short, barely exceeding the pedicel in length; they are formed of
only four segments, each bearing a pair of spines; but on the end of the
terminal segment, there are three spines, of which the central one is
very long. Second pair also short. In the sixth pair there are five or
six elongated segments, each bearing three pair of long spines; dorsal
tufts large. The cirri are furnished with transversely-striated muscles.

The _Caudal Appendages_ exist as two very minute plates, with a few
bristles at their apices.

The _Penis_ is not acuminated, with four bristles at the end; it is
short, equalling only the lower segment of the pedicel of the sixth
cirrus. In the one spec