Jæropsis neo-zelanica, sp. nov.

Body narrow-oblong, breadth about one-fourth the length. Head rectangular, about as broad as long, narrowing at its junction with the pereion, produced slightly into a rostrum between the bases of the antennæ; end of rostrum emarginate, and with a rounded lobe fitting into the emargination. Eyes somewhat large. Segments of the pereion subequal, widely separated laterally; lateral margins rounded and entire. Pleon broadly-ovate, rounded at the end; lateral margins serrated and bearing a few setæ. Antennæ very short, not so long as the head; inner one composed of five joints, the first very large, longer than the two succeeding, the others diminishing in size distally, the last bearing a small tuft of setæ; outer antennæ having the third joint much the largest, with the integument expanded laterally above, fourth joint narrow at the base expanding distally, bent outwards almost at right angles to the third, fifth somewhat longer than the fourth, followed by a short flagellum consisting of five or six