Genus Hymenicus, Dana.
(Miers' Cat. N.Z. Crustacea, p. 50.)

Hymenicus marmoratus, sp. nov. Plate VIII., fig. 1.

Garapace smooth, naked and flat; sub-triangular with the sides arched, about as broad as long; front projecting and trilobate. Antero-lateral margin with two teeth, the posterior one sharp, long, and very distinct, the anterior one short and blunt. Abdomen of male sub-triangular, first segment broadest and more or less rectangular, penultimate segment narrower than the preceding, the last segment sub-triangular, rounded at the apex. Anterior legs rather large and swollen; tarsi of the remaining legs somewhat densely haired, the other joints being sparsely haired. Colour-variously marked with white and reddish-brown. Length .25in.

Hab. Common amongst sea-weed in rock-pools in Lyttelton Harbour.

Though common at Lyttelton Harbour this crab does not appear to have been hitherto described. It is closely allied to Hymenicus varius, but differs in the shape of the carapace, in having the two teeth on the anterolateral margin well marked, and also in colour.

Genus Elamena, M.—Edwards.
(Miers' Cat. N.Z. Crustacea, page 52).

Elamena (?) lacustris, sp. nov.

Carapace nearly circular, rather broader than long. Rostrum broad, strongly depressed, concave above, sides parallel, obtusely pointed at the end. Antero-lateral margin of the carapace with two nearly obsolete teeth. Last pair of legs much shorter than the preceding. Colour (in spirit)- carapace brown, legs yellowish, spotted with brown. Breadth .15in.

Hab. Lake Pupuke (fresh water), North Shore, Auckland.

This species is remarkable from the fact that it is an inhabitant of fresh water.

I am somewhat doubtful about referring it to Elamena, as I have only seen a single specimen, a female.

Professor Hutton kindly handed over this and the preceding species to me for description.

Types of both have been lodged in the Canterbury Museum.