Genus Janira, Leach.

(Bate's and Westwood's “British Sessile-eyed Crustacea,” vol. ii., p. 335.)

As this genus is new to New Zealand, I give here the generic characters.

“Pereion serrated along the lateral margins; pleon having all the segments coalesced into a single plate; covered in the female, beneath with a large flat membranous plate concealing the branchial feet; and furnished at the tip with a pair of elongated bifid uropoda. Outer antennæ as long as the animal. Dactyla biunguiculate.”

Janira longicauda, sp. nov. Pl. xviii., fig. 2, a, to b.

Eyes large. Head rectangular, rather more than twice as broad as long, produced into a rostrum rounded at the end reaching nearly to the end of the second joint of the peduncle of inner antennæ. Inner antennæ reaching nearly as far as the end of the fourth joint of peduncle of outer antennæ; first joint stout, second about half as long, and with three or four stout setæ at distal end; third about as long as second but more slender; flagellum slightly longer than peduncle, setæ few and delicate. Outer antennæ as long as body; first three joints of peduncle short, the second bearing on its outer edge a small articulated plate, tipped with a few stout setæ; fourth joint longer than the three basal joints together, a few setæ on each side; fifth slightly longer than the fourth, narrowed at the base. Segments of pereion with lateral margins indented and fringed with stout setæ. Body of about equal width throughout. Pleon nearly circular, much