Conus illiolus (Dall, 1915)

Shell solid, slender, elongate, turritcd, of about 9 ½ whorls; nucleus small, bulbous, of about 1 whorl, smooth and oblique; suture distinct; the shoulder of the whorl sharply keeled, the space between it and the suture slightly excavated, with two fleeble spiral threads equidistant from each other, the suture, and the keel; excavated space transversely sculptured with numerous concavely flexuous, equal, close-set, slightly elevated incremental lines; suture meeting the whorl behind at nearly a right angle some distance below tin keel; axial sculpture, beside that above mentioned, comprising a series of very small, short, subequal, and nearly equidistant folds on (he whorl just below the keel, with subequal inter-spares, which do not nodulate the keel and are stronger on the earlier whorls and nearly obsolete on the last whorl; these are crossed by two or three feeble spiral threads with narrower intervals, below which the spirul sculpture is obsolete and the surface practically smooth for two-thirds the length of the whorl; the anterior third has rather coarse spiral threading of which the first 10 are paired, the anterior 10 being coarser and equidistant, aperture narrow, outer lip (defective) ; pillar straight, the anterior edge a little prominent and twisted ⁽¹⁾.

Length 41.5, breadth at keel 17 mm.

Tampa silex bids at Ballast Point, Tampa Bay, Florida. Type-specimen from the Post collection, U. S. Nat. Mus. No. 165030.

Conus illiolus

Plate 6 figs. 3, 5

Tampa, Florida

Oligocene

mm. 41,5 x 17

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Bibliografia Consultata

· (1 ) - Dall, W. H., 1915. A Monograph of the Molluscan Fauna of the Orthaulax Pugnax Zone of the Oligocene of Tampa, Florida. United States National Museum Bulletin, 90

· (1a) - Dall, W. H., 1915. A Monograph of the Molluscan Fauna of the Orthaulax Pugnax Zone of the Oligocene of Tampa, Florida. United States National Museum Bulletin, 90