On base an occasional cord seems to be stronger; on account of poor preservation the arrangement of these cannot be accurately described, but seems to be somewhat similar to that of A. maorium. No axial threads can be seen, and spirals are apparently not granulated. Five varices remain, about two-thirds of a whorl apart, rather narrow, hardly stouter than nodules, not prominent, and slightly sloping forwards. Sutures undulating, hardly discernible, but margined by a cord stouter than the others. Spire very high (1·½–2 times height of aperture without canal). subturreted, giving shell a slender appearance, which in conjunction with its rather regular growth readily distinguishes it from any other New Zealand member of this genus. Aperture (filled with matrix) certainly small; outer lip reflected inwards past varix to form a sharp edge. Canal hidden and broken, but from small size of fracture-area it is evident that the amount lost is very slight, so that complete canal is probably short. Height, 33 mm.; diameter, 16 mm.; height of aperture, 14 mm. Type, from Broken River, Trelissick Basin (lower beds, Ototaran), in collection of New Zealand Geological Survey. No other specimens at present known. The species seems to be characterized chiefly by its high spire; strong, regular, and smooth spiral threads; and rounded tubercles, some of which on early whorls are elongated slantwise, giving shell a Perissoptera-like appearance. Hutton at one time thought the species was identical with C. tortirostre (Tate), but Tate repudiated this identity (Trans. Roy. Soc. S. Aust., vol. 10, p. 124), and did not compare it with any other species. In attenuated shape it resembles C. protensum (Tate), and if canal is long would be very like this species. It is also somewhat like A. woodsi (Tate), and this species also has a long canal. On the strength of this last resemblance Hutton's species is here placed in Austrotriton, but with much doubt, since the resemblance to the genotype, A. radiale (Tate), is but slight, though there do not seem to be essential generic differences. This is one of the “difficult” forms referred to in the remarks on A. maorium. It is in some respects like a Charonia, but the character of the varices seems to forbid placing it in that genus. Austrotriton cyphoides n. sp. (Plate 51, figs. 3a, 3b.) Shell small, shortly fusiform, with prominent peripheral carina and nodules. Protoconch globular, slightly asymmetrical, of about 4 smooth convex whorls, but tip is lost. Four whorls succeed this, strongly carinated below middle; shoulder straight, slope almost about 40°, thence slanting slightly in below carina to suture below; base rapidly contracted into broad, slightly twisted beak; varices at a little less than every three-quarters of a whorl, very low and inconspicuous, broadly convex towards aperture, but angled and concave away from it. Five strong peripheral nodules between varices, sharp along keel but blunt vertically; they extend to suture below on spire-whorls but hardly at all on shoulder; on body-whorl they vanish just below periphery, their termination being indicated by a spiral cord slightly more prominent than the others; no anterior keel apart from this. Whole surface bears slightly undulating, narrow, flattish spiral cords, interstices much wider on shoulder and base but narrower on keel; rarely one interstitial riblet on base. Extremely dense and fine axial threads (not visible except under good lens) run over whole surface, producing slightly roughened effect. Aperture broken, but evidently lirate-dentate within, inner lip spread thinly over columella,