Trichoniscus kermadecensis sp. nov. Fig. 3.

Body oblong-oval, greatest breadth about half the length, narrowing somewhat to each end, pleon not abruptly narrower than peraeon. Dorsal surface of head and peraeon scabrous with small spinose tubercles, mostly arranged in transverse lines, a few small ones on segments 3–5 of pleon, but remainder of pleon nearly smooth.

Head much broader than long, antero-lateral angles a little produced and rounded, frontal margin slightly convex, first segment of peraeon with antero-lateral angles reaching half-way along the lateral margins of the head, posterior margin straight, posterior angles rectangular and slightly rounded; posterior angles of the second segment similar, those of the third to the seventh segments progressively more produced and acute, those of the seventh reaching almost to the end of the epimera of the third segment of the pleon; third, fourth, and fifth segments of pleon with fairly well-developed and evident epimera, terminal segment triangular, posterior margin straight with angles slightly rounded and bearing 3 or 4 minute setules.

Fig. 3.—Trichoniscus kermadecensis: Pleon and uropoda.

Eyes of three ocelli slightly separated from one another.

Antennae rather stout, fourth joint of peduncle slightly tuberculated, fifth as long or longer and more slender, its anterior margin with 3 or 4 spiny tubercles, posterior margin with fine setae, flagellum slightly longer than the last joint of peduncle, indistinctly divided into 5 joints, with the usual pencil of long setae at the end. Uropods with basal joints very broad, extending a little beyond the posterior segment, outer ramus one and a half times as long as the base, inner ramus about half as long as the outer, its base concealed by the basal joint in dorsal view, both with a fur of fine setae and with a few long setae at the end.

Length of body, 4 mm.; breadth, 2 mm.

Colour.—Greater part of dorsal surface dark brown or almost black, with 2 broad indistinct bands of lighter markings a little to each side of the median line; some specimens much lighter in colour than others.

Hob.—Four specimens, labelled “Fresh-water stream, Sunday Island.” It is probable, however, that these animals do not habitually live in the water, but in damp moss, &c., on the banks of the stream.