Conus (Dauciconus)  planiceps (Heilprin, 1887)

 

 

Shell broadly conical, rapidly tapering toward the base; spire reduced to a minimum, represented in most specimens by an exceedingly gentle rise, crowned by a papilla (apex); whorls about seven, all of them fully exposed on the crown, the shoulders concentrically lined; revolving lines nearly obsolete over the greater extent of the body-whorl, prominent on the basal portion; notch? (1)

Length, 14 inches; width of crown, 0.8 inch (1).

 

Very closely resembles Conus haytensis of Sowerby, a Santo Domingo fossil, from which it may distinguished by its more regularly depressed  crown, and the character of its ornamentation. The latter species is so variable, however, that not impossibly the Florida form may ultimately prove to be only a variety, although in the extensive of specimens contained in the Gabb collection, illustrating Sowerby's species, I fail to find anything which fully agrees with it (1).

 

 

Upper Eocene to Lower Miocene

 

 

 

 

Conus planiceps (1)

Plate 15 fig. 48

 

 

Conus planiceps (2)

Plate 6 figg. 1,2

 

 

 

Conus (Dauciconus)  planiceps wakullensis (Mansfield, 1937)

 

 

 

Shell of medium size, rather broadly conic, low spired, con­sisting of about 6 postnuclear whorls, nucleus not preserved. Spire very broadly and evenly conic, rising about 7 millimeters above the shoulder of the body whorl. Suture distinct and weakly depressed. Whorls not depressed in the area of the anal fascicle, sculptured with 2 or 3 rather strong concentric threads. Body whorl sculptured only on lower half by rather coarse raised concentric lines, the upper ones being paired (4).

 

The holotype (U. S. Nat. Mus. no. 495936) measures: Length, about 40 mm.; greatest diameter, about 22 mm. The holotype con­sists of an external impression of the original shell (4).

Type locality: Station 12292, Cherokee Sink, Wakitlla County, Florida.Horizon: Tampa limestone, lower Miocene (4).

 

The new subspecies is closely related to both C. planiceps Heilprin and C. designatus Dall. It has a higher spire than C. planiceps and larger and more strongly sculptured in the area of the anal fasciole than Conus designatus. The sculpture on the base is similar to both the above species (4).

 

 

Occurrence: common at the type locality; station 12293, Wakulla Railroad Station, Wakulla County; station 13840, 1 ¼ miles northeast of Lloyd, Jefferson County.

 

 

 

Conus planiceps wakullensis (4)

 

 

Bibliografia Consultata

 

·        (1) - Heilprin, A., 1887. Fossils of the Silex-Bearing Marl (Miocene) of Ballast Point, Hillsboro Bay. Transactions of the Wagner Free Institute of Science of Philadelphia, 1