neck which bears strongly-developed fasciole with rounded median ridge marking inner side of the narrow anterior notch. Sculpture: body-whorl with two strong, spaced spiral cords on periphery; above, on the concave shoulder, are fine spiral threads, and below, another strong spiral starts from about line of suture; it is the top one of about 14 between there and fasciole. Of these the upper five are stronger than the lower ones. Space between peripheral and sutural spirals with three sharp spirals of secondary strength, upper two fairly close together, and with single fine thread between them; between lower two, are three similar threads and a single one between lowest and sutural spiral. Interspaces of strong spirals on base and neck also with spiral thread. Sides of body-whorl with obsolete axial ribs. All interspaces crossed and fine spiral threads reticulated by regular growth-lines. Spire-whorls with moderately strong axial ribs about 16 per whorl, crossed by two spaced spirals at angle of shoulder, and with six weaker spirals on sides, the alternate ones being of secondary strength. Suture appressed. Aperture with a deep, narrow anterior notch. Outer lip with widely concave sinus on shoulder then sweeping forward in wide convexity opposite side and base. Columella smooth, gently bent to canal. Inner lip definitely limited, excavated, not quite obliterating two folds formed by edges of apertural notch.

Holotype in collection of N.Z. Geological Survey.

Height (estimated), 35 mm.; diameter, 13 mm.

The sculpture somewhat resembles that of A. excavata Suter, but the shape is very different.

Austrotoma toreuma n. sp. (Fig. 72.)

Shell of moderate size; spire slightly higher than aperture. Post-embryonic whorls about 6, angled above middle, with strongly concave shoulder and vertical sides. Body contracting relatively quickly to short almost straight neck which bears well marked fasciole strongly ridged down the middle. Sculpture, about 25 forward-sloping axial ribs per whorl, commencing at shoulder angle and dying out on base. Spire-whorls with six strong, spaced spiral cords, interspace of 3rd and 4th on penultimate whorl with a single spiral thread. Shoulder with five spaced spiral threads the outer one stronger than rest. Body-whorl with 16 strong, spaced spiral cords, top three a little closer and inclined to be nodulous where crossing axials; on shoulder, are now six threads, outer one almost as strong as the ones on sides and base. The single interstitial thread of penultimate whorl continues on to body and interspace below it also develops one, but the other interspaces do not. Shoulder and interspaces crossed by very strong regular growth-lines. Suture appressed. Aperture oblong, with deep, narrow, anterior notch. Outer lip with wide, concave sinus on shoulder; convex below. Columella smooth, gently bent to canal. Inner lip definitely limited, excavated, not quite obliterating traces of the fasciole.

Holotype in collection of N.Z. Geological Survey.

Height, 30 mm.; diameter, 12 mm.

Easily distinguished from A. inaequabilis by the very strong sculpture, and general absence of interstitial spirals, and from A.