tor, and
directed in an unusual manner towards the ventral surface of the thorax:
the trophi are arranged, in a curved line, facing the thorax (see Pl. V,
fig. 2, for this part in the male), and therefore less laterally than is
usual.

_Labrum_ (Pl. IV, fig. 8 _a'_ opposite _c_) highly bullate; the upper
part produced into a blunt point: on its crest there are no teeth.

_Palpi_ (fig. 8 _a'_ opposite _d_) small, blunt and rounded at their
ends; inner margins slightly concave.

_Mandibles_ (Pl. X, fig. 4), with three teeth, of which the first is
much larger than the second and third, and distant from them: inferior
angle produced and pectinated; upper edges of the second and third teeth
finely pectinated.

_Maxillae_ (Pl. X, fig. 11) small, slightly but distinctly indented by
two notches, supporting, besides the three upper great spines, three
pairs of moderately long spines and some finer ones: apodeme short,
thick.

_Outer Maxillae_, unusually pointed, with the inner bristles not very
numerous, continuously arranged; externally, the bristles are longer.
Olfactory orifices, tubular, projecting, flattened, square on the
summit, smooth: they point upwards and obliquely towards each other:
they arise more laterally than in the other genera, namely outside the
bases of the outer maxillae, and between them and the inner maxillae.

Between the bases of the first pair of cirri, there is a conical
prominence, clothed with bristles and coloured purple: it projects
nearly as high as the top of the lower segment of the pedicel of the
first cirrus: it lies over the infra-oesophageal ganglion, and serves, I
suspect, to fill up a little interval between the outer maxillae.

_Cirri_ long, little curved: the first pair (Pl. IV, fig. 8 _a'_) is
situated at an extraordinary distance from the second; hence its basal
articulation is on a level with the upper articulation of the pedicel of
the second cirrus. In the three posterior cirri, the segments are
laterally very flat, with their anterior surfaces not protuberant; each
supports three pairs of thin, non-serrated bristles, of which the second
pair is much shorter than the upper, and the lowest pair minute; between
each pair there is a minute, rectangulary projecting bristle; dorsal
tufts consist of two or three spines, of which one is longer than the
others. The two bristles forming each pair, are not of equal length; for
in the rami of each cirrus, the inner row of bristles is