Fintay.—New Shells from New Zealand Tertiary Beds. 453 
Austrotriton maorium n. sp. (Plate 48, figs. 1, 2, 3; Plate 51, fig. 4.) 
Cymatium minimum (Hutt.): Suter (in many lists of fossils from Awamoan and 
r horizons), not of Hutton. 
on lower whorls are typically 5 strong, elongated, peripheral swellings between 
varices (which occur at about every three-fifths of a whorl), continued as 
faint ribs over shoulder and base, vanishing on canal. Swellings narrow, 
high, and blunt, but often tubercular at each extremity; last swelling con- 
siderably weaker than others, and on higher level, so that a distinct drop 
is apparent after each varix. On y-whorl are 4 main spiral cords, two 
marking peripheral angles and two below these, lowest in line with last 
denticle on outer lip ; below these, strong and weak smooth cords alternate 
on canal. Between main cords are 3-6 finer cords cut up into elongated 
granules, shoulder with similar sculpture but cords wider apart just after 
a varix. Spire shorter than aperture with canal. Aperture suboval, a 
little oblique, channelled above, produced below into a canal equal in length 
to aperture and bent backwards to left. Outer lip sharp, with strong thick 
varix behind, also thickened internally and with 5 tubercles, the lowest 
at top of canal. Inner lip a little spreading, often with 2 or 3 small plaits 
on parietal wall. Columella strongly curved, with a few plaits at base, 
two much stronger than the others. A distinct umbilical chink generally 
sent 
resent. 
F Height, 38 mm.; diameter, 21 mm.; height of aperture and canal, 
22 mm. (type). Height, 25 mm.; diameter, 13 mm. ; height of aperture 
and canal, 13-5 mm. (largest paratype). 
, several half-grown, and many juvenile specimens, from Target 
Gully, in author's collection; also specimens from the following horizons 
and localities: Awamoan (Pukeuri, Rifle Butts, Mount Harris); Hutchin- 
sonian (Otiake); Ototaran ? (Clifden, bands 4, 6, and 7); Waiarekan ? 
(Chatton). ` 
is is the common “ Cymatium” of Oamaru localities. Juvenile 
shells are met with at most of the collecting-grounds there, but the full- 
grown shell is apparently rare, the type and three more from Clifden being 
the only ones seen. It is of fairly constant appearance when large, but 
the canal varies considerably in length, especially in juveniles, which also 
differ in appearance from adult shell in their finer sculpture and more 
regular growth. The species has no resemblance to C. minimum (Hutt.), 
and its previous identification with Hutton's species must be attributed 
to the loss of his holotype. It is, however, very closely allied to the 
the 
complete absence of denticles on outer lip and columella, much finer and 
