Conus convexus
(Harris, 1897)
Description.
Protoconch composed of two
smooth turns, the initial portion
of which is lateral and
immersed ; much elevated above the
remainder of the
shell. The whorls
of the spire,
five in number, are slightly convex, and
are thus not excavated as in other species mentioned; they are ornamented by five or six deeply-cut sulci, somewhat
irregular in places owing
to the intersection
of growth marks these latter, however, do
not approach tessellation. The whorls are
not staged, but the suture is
distinctly canaliculated, especially as the growth approaches the ephebic stage. The body-whorl has
an elevated band at its periphery,
which is rugosely
lineated; its
whole surface is covered by
small, undulating, irregular sulci, which
broaden anteriorly and are interrupted by sinuous growthlines. Aperture long,
narrow, its two
margins parallel with each other ; outer margin
thin, curved, and distinctly crenulated
within ; anal sinus broad and
comparatively shallow, inner margin
straight.
Its protoconch
is very different to that
of C. pullulescens; and the convexity of the whorls, deep
sulci, canaliculate suture, and crenulated margin
of the aperture,
are highly distinctive. On comparison with C.
complicatus,
Tate, in addition to
the characters just mentioned, observed that C. convexus is broader, and the spire less elevated, whilst
the ornament is peculiar
to it moreover,
the whorls are not
staged, neither is the sinus deeply, arcuately notched.
Dimensions (of the
type specimen). Length 17
mm.; breadth 9 mm.
Form,
and Loc. Eocene : Meribee Plains,
Victoria. (1).
|
|
|
Conus convexus (1) Pl. II – Fig. 5 (Pag. 444) mm. 17 x 9 Eocene - Australia |
Conus convexus
(Marshall, 1918)
Conus thorae (Finlay,
1927)
Shell of moderate size, 27 mm. By 13 mm. Spire conical, about one-sixth the length of the shell, and consisting of 5 whorls. Outline of each whorl convex. Aperture linear, narrow. Ornamentation: whorls of the spire lyrate with about 10 lirae, which are more pronunciated on the anterior then on the posterior part of the whorl. Line of growth not distinct. Body whorl has fairly well-marked lines of growth, but it is otherwise smoth except for some 10 spiral lirae near then anterior end (2).
A single specimen, in good condition. Type in Wanganui Museum (2).
|
|
|
Conus convexus (2) (Marshall, 1918) New Zealand mm. 27 x 13 |
Bibliografia Consultata
·
(2) - Marshall (1918) “Art. XXVII.—The Tertiary
Molluscan Fauna of Pakaurangi Point. Kaipara Harbour.” TRANSACTIONS AND
PROCEEDINGS OF THE ROYAL SOCIETY OF NEW ZEALAND, VOLUME 50, 1918, 1918, PAGE
270