Genus Laoma, Gray.

8. Laoma ciliata, n. sp. Plate XXI., figs. 38, 38a.

Shell minute, pupiform, perforated, pale-horny without markings, not shining, very thin and fragile, diaphanous, with oblique somewhat distant thin ribs, about six per millimetre, which are produced into a tooth-shaped membrane below the suture; a second row of ciliæ is on the body-whorl round the base, but they are mostly rubbed off; interstices with fine growth-lines. Spire elevated, first cylindrical, then dome-shaped. Embryonic whorl smooth, blunt. Periphery angled and sinuated. Whorls 6, the first three very slowly, the others more rapidly increasing in size; they are slightly convex above, rather concave below, the last carinated near the aperture; suture not deep. Aperture transverse, squarish, the outer lip sinuated, the basal slightly arched, and the colu-mella almost straight and vertical, but little expanded above. Mouth with two. lamellæ; one slender, long lamella on the middle of the outer lip, and a similar one in the angle where the outer and basal lip meet. Umbilicus previous, very narrow, but open. Base almost flat.

Diameter, 1 ¾mm.; height, 2mm.

Hab. North Island: Near Wanganui, where it was discovered by our most enthusiastic conchologist, Mr. R. Murdoch.

Note.—This highly-interesting little shell is totally different from most of the other species of Laoma s. str.; in the peculiarities of the epidermis it is allied to Phrixgnathus regularis, Æschrodomus, and Therasia celinde and tamora

Dentition very much the same as in Laoma leimonias. Formula of teeth 15—1—15.

9. Phrixgnathus murdochi, n. sp. Plate XXI., figs. 39—39b.

Shell depressed conoidal, broadly umbilicated, pale-horny, waxen, thin, diaphanous; finely and closely radiately striated, striæe crossed by microscopical spiral lines; spire somewhat dome-shaped, rather acute at the apex; embryonic whorl smooth; periphery carinated. Whorls 6, slowly and regularly increasing, flatly concave, strongly margined, margin projecting, tessellated with white and chestnut, the last not descending in front; suture superficial. Aperture squarish, diagonal; peristome straight, acute, outer lip sinuated, basal lip nearly straight, columella straight, slightly oblique, a little reflexed above. Umbilicus broad, 45 per cent. of the diameter,