Conus hanza (Noetling, 1901)

Descrizione ⁽⁴⁾.

The shell is of small size only, double conical in shape consisting of a high elevated spire and a large attenuated body whorl.

There are three to four rounded and smooth embryonic whorls, which formed a high spire during the brephie stage.

The spire is composed of about six whorls, separated by a sharp suture; the surface of the whorls is steeply inclined towards the suture in the earlier whorls, but becomes flatter with advancing age; as each succeeding whorl does not reach up to the preceding one, the profile line of the spire is, though curved, distinctly step-like. .The ornamentation consists of a few revolving lines.

The body whorl is large, broad at its posterior, accuminate at its anterior end; a sharp keel sets off a small posterior part which is slightly concave, sloping towards the suture, from a large anterior one sloping in opposite direction. The revolving lines hare disappeared on the posterior part, and there are only strisae of growth a few of which are raised and sharper than the others, following at regular intervals, thus imitating longitudinal ribs. The whole length of the anterior part covered with about 20, deeply engraved revolving lines, separated by broad and flat interstices.

Aperture not observed.

Descrizione pag. 280 ⁽²⁾.

Two species have been figured under this name, one of which (pl. xxiii, fig. 23) corresponds with the previously described Conus (Leptoconus) Bonneti Cossmann. The other specimen (fig. 24) remains as the type of C. (Leptoconus) hanza which is distinguished from Conus Bonneti by its smaller dimensions, its much more ventricose body-whorl, and the absence of a rim to then spire-whorls.

Epoca: Miocene

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Despite some apparent differences in the shape of the spires, perhaps determined by the fact that it is a drawing, Conus hanza seems to me to be closely related to Conus olivaeformis.

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Conus hanza

Pl. XXIII fig. 24

mm. 27 x 14

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Bibliografia

· (1) - Vredenburg, E., 1921. Comparitive Diagnoses of Conidae and Cancellariidae from the Tertiary Formations of Burma. Records of the Geological Survey of India, 53

· (2) - Vredenburg E. (1921) Results of a revision of some portions of Dr Noetling's second monograph on the Tertiary fauna of Burma, Records of the Geological Survey of India 51, 224-302

· (3) - Eames F. E. (1950) On the ages of certain Upper Tertiary beds of Peninsula India and Ceylon, Geological Magazine 87, 233-252

· (4) – Noetling (1901) “FIGURES AND DESCRIPTION OF THE ORGANIC REMAINS PROCURED DURING THE PROGRESS OF THE GEOLOGICAL SURVEY OF INDIA”