158 Transactions. 
transverse threadlets of dorsal area absent on the nacreous shell, the longi- 
tudinals less numerous, while basal sculpture is same as on periostracum. 
Specimen to be presented to the Wanganui Museum. 
In the Geological Survey collections is an imperfect specimen, locality 
not recorded. In Mr. Finlay's collection is a large fragment from Wai- 
kouaiti sandstone, a small cast from Caversham sandstone, and the large 
sandstone. These certainly represent the Awamoan horizon. Мт. ay 
writes that from the matrix he obtained Alectrion socialis, Bulinella e 
Dentalium mantelli, and Malletia australis. 
Pinna distans Hutton. (Plate 9, fig. 3.) 
Original Description.—Large, with distant plications, ies Pt being 
much narrower than the furrows. Height, 9; length, angle of 
apex, 40°. Locality, Caversham 
The type, as previously mentioned, is a cast only, and agrees perfectly 
with Buchanan’s figure, which is here ‘reproduced. There are about eleven 
prominent distant ridges on the dorsal area, and on the basal area a 
above. А fragment of a cast from Milburn limestone in Mr. Finlay's 
collection perfectly agrees in sculpture with the type. On present material 
little more can be added. The species appears to be closely allied to lata, 
the greater prominence of the radiations being the distinguishing feature. 
In the Suter collection are two small fragments from Waihora River, two 
miles from Te Karaka, Poverty Bay, They are casts of the apex, and are 
labelled “ distans," but the radiating sculpture appears to me identical 
with the Awamoan specimen, which I refer to lata. 
CHALAMYS. 
Chlamys oamarutica n. sp. (Plate 9, fig. 4.) 
Shell (left valve) small, thin, nearly equivalve, very little inflated, ears 
unequal, triangular, posterior small and very oblique; dorsal margins of 
dise uu. slightly concave, anterior, posterior, and basal margins 
rounded. ulpture consists of thirteen or fourteen small radiate ribs, 
sparsely Busco and much narrower than interspaces, in the latter one, 
two, or three smaller riblets on basal half of disc, in addition the whole 
shell is adorned with an exceedingly delicate lacework - like sculpture. 
Anterior ear with about six small riblets, posterior ear with three some- 
what scaly riblets. Interior hinge-line somewhat oblique, narrowly groove 
within margin, resilifer-pit small and slightly oblique, adductor-scars indis- 
tinct, radiate grooves correspond with external sculpture and lightly crenu- 
late the margin. 
ensions : Dorso-ventral, 26 mm. ; ant.- e 24 mm. 
Type to be presented to the c— Museum 
Locality, Target Gully shell-bed, Oam 
It is with some hesitation that I онак this species from а single 
valve. * Its sculpture, however, a tii to distinguish it well from other 
of our Tertiary and Recent forms 
