Conus convexus (Harris, 1897)






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