490 Transactions. 
species are under consideration. The convenient excuse that “ the particular 
forms that conchologically agree are known, in the few cases that animal 
or opercular features have been studied, to disagree " is unfortunately not 
available for the palaeontologist, and it will not be the easiest of matters — 
to decide at what stage of the Tertiary the line of separation should be — 
drawn. D 
Rissoina chathamensis (Hutt.). 
R. rugulosa (Hutt.) (see Iredale, loc. cit., p. 453). 
Locality : Castlecliff. 
Rissoina (?) obliquecostata M. & M. У 
This shell is, as its describers remark, “ very different from any other 
of our Recent or fossil Rissoids.” It does not look adult, though 
cannot well be judged from a figure, and is quite probably not a mem 
of this family at all. Тһе “‘narrow subperforation at the side of t 
columella, bounded by a small funicular ridge which curves round to t 
basal lip," is not reminiscent of any Rissoid. 
Locality : Hampden. 
Nozeba candida n. sp. (Fig. 12.) F 
Rissoina emarginata (Hutt.): Suter, N,Z. Geol. Surv. Pal. Bull. No. 8, 
p. 82 (not of Hutt.). 9 
Shell small, trapezoidal, imperforate, polished, milk-white, loosely 
coiled, base truncate, with a few spirals. Protoconch minute, smoo 
uch more prominent; these vary in n 
from 4 to about 7, fairly equally spaced, but those near columella closer. 
and fainter. A very shallow sulcus runs parallel with suture just 
giving it an indistinctly margined appearance. Suture distinct 
impressed, also very faintly submargined above. Spire conical, not mue 
higher than aperture. Aperture subvertical, subtriangular, the almost 
basal margin extending nearly whole width of aperture, outer li 
ing to meet it in a gentle curve, union of the two much produc 
A strong lowly-convex and rather wide varix encircles outer lip, w ich. 
bluntly-rounded edge.  Peristome continuous, of irregular shape, hea 
calloused along parietal wall; a narrow posterior channel in à 
basal lip somewhat effuse and hollowed out, forming a very wide i 
tinct canal. Columella oblique, covered by the well-marked callus 
inner lip, meeting basal lip in a bluntly rounded acute angle. 
Height, 2-7 mm. ; diameter, 1-4 mm. ; height of aperture, L2mm. - 
. Type and many paratypes, from Pukeuri, in the author's collecto 
Also found at Ardgowan and Target Gully. 
