_Peduncle_, broad, about as long as the capitulum; surface of attachment wide; calcareous scales minute, placed in transverse rows, which become less and less regular in the lower part. The scales do not stand very close together; they are of unequal sizes and irregular outline; generally spindle-shaped; calcareous matter is added regularly only to the scales in the uppermost row, and irregularly to some of the lower scales. The latter, consequently, are the largest, and often much elongated; they are sometimes of singular and irregular shapes. _Colour._--The membrane covering the valves and forming the peduncle, (after having been long kept dry, and not having been in spirits,) is dark reddish chocolate-brown; corium of sack dark purple; cirri banded with dark purplish-brown, with the lower parts of the trophi similarly coloured. _Filamentary Appendages_, none, but on the prosoma there are scattered some small papillæ, which are roughened by finely spinose scales, like combs; these papillæ certainly seem to represent the filaments in _Pollicipes cornucopia_ and its two allies. _Ovigerous Fræna_, seated in the same position as in _P. spinosus_, but rather longer, with an elliptical _tuft_ of glands on the crest. _Mouth_, not placed far from the adductor muscle. _Labrum_, moderately bullate, with the upper part not overhanging; no teeth on the crest. _Palpi_, short, broad, blunt. _Mandibles_, with three main teeth, with either one or two smaller teeth inserted between the first and second, making four or five altogether; inferior angle rather narrow, pectinated with long and fine spines. _Maxillæ_, rather broad, with two long upper spines; beneath which there is a very small prominence bearing a minute tuft of fine bristles; beneath this, there are eleven pairs of rather long and strong spines; and the inferior angle is formed by a rather broad, upraised, and obliquely rounded prominence, bearing a broad tuft of fine spines. _Outer Maxillæ_, with the inner surface continuously clothed with short spines; exteriorly there is a slight prominence with long hirsute spines. _Olfactory Orifices_ barely prominent. _Cirri._--First pair placed near the second; the segments of the three posterior pairs are slightly protuberant, and bear three or four pairs of finely serrated spines; intermediate tufts long, the middle spines being the longest; spines on the upper lateral edges long and strong; dorsal tufts rather short. _First cirrus_, long, multiarticulate, having fourteen or fifteen segments, whilst the sixth cirrus had nineteen segments; rami unequal in length by about two segments; basal segments protuberant brush-like. _Second_ and _third cirri_ with five basal segments of both rami protuberant and brush-like; but the anterior rami in both cirri are broader than the posterior rami. Spines on the protuberant segments of both rami of both cirri, coarsely and doubly pectinated.