Genus Stenetrium, Haswell.

(Proc. Linn. Soc. N.S.W., vol. v., p. 478.)

As this genus is new to New Zealand, I transcribe the generic characters:—

“Body dorso-ventrally compressed; abdomen short, 1-jointed. Head with a short rostrum. Antennæ inserted on the anterior margin of the head; internal pair very short, external pair very long; both with well-developed flagella. Mandibles provided with a palp. Maxillipedes expanded, operculiform. First pair of thoracic limbs with a large prehensile manus; following pairs ambulatory. First pair of abdominal appendages broad, operculiform. Caudal appendages biramous, inserted on the border of the shield-like abdomen near the extremity.”

Stenetrium fractum, sp. nov. Pl. xviii., fig. 3, a to f.

Inner antennæ reaching slightly beyond the end of third joint of outer antennæ; first joint of the peduncle large, as broad as long; second equal in length to the first, but more slender; third rather longer than the second, both bearing long setæ at their distal ends; flagellum about half as long again as the third joint of peduncle, consisting of about five joints, first joint the longest, being as long as the three following. Outer antennæ as long as the body; first joint of peduncle short, produced acutely at its extero-distal angle; second also short; third as long as the first and second together, produced acutely at its intero-distal angle, bearing on the outer edge an articulated appendage, which has the end rounded and supplied with a few long setæ; fourth and fifth joints very long, fifth slightly longer than the fourth, both with a few rather fine setæ; flagellum with the joints very short, almost linear at the proximal end, increasing gradually in length towards the distal end, the first few united into a single joint; fine setæ at intervals. First pair of gnathopoda with the meros and carpus subequal and supplied with numerous fine setæ; propodos large, expanding distally, both margins fringed with fine setæ, palm transverse, defined by a stout tooth, and armed with strong serrated setæ. Dactylos thick and strong, inner edge thickly fringed with strong denticulated setæ. Lateral margins of the abdomen irregularly serrate and with a few long