FixLAY.—New Shells from New Zealand Tertiary Beds. 477 
Type, from Petane, in collection of New Zealand Geological Survey. 
This shell was included by Suter amongst specimens of A. suteri Marwick 
and labelled “ Newtoniella n. sp." It has strong affinity with A. nodi- 
cingulatum, from which it is probably descended, just as 4. pyramidale subsp. 
robustum may be the successor to A. pyramidale. It is distinguishable, 
differently shaped canal, and apparent absence of an upper columellar 
plait. It also = analogy with A. huttoni Cossm., though this has different 
spiral sculptur 
Besides the four new species or varieties of Ataxocerithium described above, 
four others have been named from the New Zealand Tertiary. These are 
. huttoni Cossm., A. pine iis М. & M., A. suteri Marwick, and 
A. tricingulatum Marwick. 
A. huttoni Cossm. is readily distinguished by its low and convex spirals 
with narrow interstices, the spirals being practically confined to base and 
spaces between axial ribs. Axials numerous, sloping forward, sharply 
convex, and without nodules, interstices a little wider. There are 5 Ape 
per whorl and about 7 more on base; axials number about 30 o y- 
whorl. Shell is fairly large and relatively wide, angle i spire Aue 45°. 
Locality, Castlecliff. The type, which was stated by Suter to be apparently 
lost, has been rediscovered amongst the Geological аот cir and is 
now in that collection. The writer agrees s with a manuscript remark by 
Mr. Marwick regarding this species: “ The locality, Hampden, given 
Hutton and Suter should be deleted, as Dr. Marshall’s extensive collections 
have given a better idea of that fauna.” The Hampden record is possibly 
based on a fragment of the somewhat similar Alectrion socialis (Hutt.), 
which does occur there. : 
. perplecum М. & M., described by Marshall and Murdoch* from 
imos, is really a “Cerithiden, very close to C. bicarinata Gray, and is 
possibly only this species with the keels rubbed off. Many specimens of 
A. m M. & M. have been found during the last year, but all are highly 
polished and worn, and until the discovery of better-preserved · specimens 
Marshall any Murdoch's species should stand, as Cerithidea perpleza M. & M. 
A arwick: This species is described on page 195 of this volume. It 
comes tiani Okawa Creek shell-bed, Ngaruroro River (Geol. Surv. loc. 1063), 
and also from Petane, and is a very distinct form. Its exceptionally 
tall хоме (angle about 20°) characterizes it at once; there are 3 coarsely- 
nodulous cinguli per whorl, and 3 more on base, nodules are in line on 
successive spirals, and roughly indicate axial ribs as strong as spirals, 
interstices between spirals and axials are sublinear. A figure of this species 
(Plate 51, figs. 9a, 96) is given in order that its characteristic sculpture may 
be contrasted with that of the other ое described. 
A. um Marwic om the same locality (Okawa Creek), 
also С айчы in this volume (p. 194). It is very similar to the previous 
species in scülpture, but axial ribs are more distinct and numerous, nodules 
smaller and finer, and the three basal ribs almost smooth. It is at once 
distinguished by its shape, the spire being much less acute (angle about 35^) 
and suture much more deeply incised. Besides the type, only two specimens 
from Nukumaru (ir author's collection) are known. 
* P. MARSHALL and R. Мокросн, Some New Fossil Species of Mollusca, Trans. 
N.Z. Inst., vol. 51, p. 254, 1919. 
