Conus vredenburgi (Nath & Chiplonker, 1938)

The conical spire shows three or four whorls with height about onefourth of their maximum width, corresponding with the anterior margin. Spire angle is about 63°. Whorls are angulated anteriorly at about one-third height. Region anterior to the angulation is sub-vertical, while the posterior region is conspicuously concave. The slightly raised posterior margin and the angulation give the appearance of two closely situated cords winding round the spire up to the apex. This two-cord structure is likely to suggest six or eight spire whorls. On the concave posterior slope, fine, crowded growth-lines are concave forward. They are antecurrent to the angulation and retrocurrent to the posterior margin. They give to the angulation and to the posterior margin an aspect of a row of scaly plates facing backwards.

Body whorl is conical with feeble convexity. Here the growth lines are convex forward. Anteriorly to the angulation, body whorl is decorated with rather broad, almost flat, ribbon-like spiral threads alternating in two sizes to which the fine growth-lines give a rope-like appearance. Angle of the body whorl is about 19° .

Comparison.--Due to the two-chord aspect of the spire-whorls, the present species resembles Conus (Leptoconus) brocchii (Bronn); the latter has, however, wider spire angle, taller spire, wider angle of the body whorl and no rope-like decoration on the body whorl.

Occurrence.--Middle division of the Upper-Middle Kirthar of Laki-Dome north-west of Laki village.

Conus vredenburgi

P1. XVI, Fig. 2

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Bibliografia

· (1) - PALAEONTOLOGICAL STUDY OF GASTROPODS FROM LAKI AND BAGATORA, SIND. BY RAJ NATH, M.Sc., PH.D. (LOND.), D.I.C. AND G. W. CHIPLONKER, M.SC.