en by them, there is a tuft of fine spines; in the middle
there is a second similar tuft mounted on a prominence; and at the
inferior angle there is a third tuft, also mounted on a rather wider
prominence, not quite accurately figured. In the interspaces between
these tufts there are three or four pairs of spines of the usual
appearance and projecting just beyond the fine tufts; the upper of the
two interspaces is rather narrower, but rather deeper, than the lower
interspace. Apodeme very long, irregularly shaped, like an =S=, with a
remarkable elbow near its attachment; apex slightly enlarged, thin and
rounded.

_Outer Maxillae._--On the inner margin there is a deep and conspicuous
notch, above and beneath which, there is a compact row of serrated
bristles; exteriorly the bristles are rather longer.

_Olfactory Orifices_ very prominent, pointing obliquely towards each
other.

_Cirri._--Posterior cirri moderately long, much curled, with the
segments (Pl. X, fig. 27) flattened and wide; the anterior surface
hemispherically protuberant, supporting six pairs of spines, of which
the lower ones approach each other; between these spines there is a
large tuft of very fine spines, of which the central ones are the
longest; there is an upper lateral group of very short strong spines;
dorsal tufts composed of short, fine numerous spines. _First pair_
seated close to the second pair, short, having in both rami eight
segments, whereas in the same individual the second pair, which is
nearly twice as long, had thirteen, and the sixth pair eighteen
segments. Rami of the first pair nearly equal in length, with their
segments, excepting the two upper ones, thickly paved with bristles, in
the midst of which a tuft of fine spines, as in the posterior cirri,
may be distinguished; the dorsal tufts encircle the whole of each
segment; the spine-bearing anterior surfaces are protuberant chiefly in
the upper part, so that they are oblique. The posterior (?) ramus has
its segments much wider than those on the other ramus; and amongst the
common spines, in the third and fourth segments, (counting from the
bottom,) there are some very strong spines with their upper ends
coarsely and doubly pectinated, each tooth being upwardly bent into a
rectangular elbow. In the fifth segment, some of the spines are doubly
pectinated with simple teeth; and most of the spines are doubly
serrated. The _Second_ (Pl. X, fig. 25) and _Third cirri_ have the five
b