Conus
larvatus (Pilsbry & Johnson, 1917)
Description.
The shell
is extremely slender, the length about 38times the diameter, fusiform. Spire produced, composed of
flat whorls, the beaded periphery
projecting above the suture; apical whorls lost. The last whorl is angular, the angle
set with 25 bead-like tubercles, which
are a little lengthened in the spiral direction; elsewhere, above and below the angle, it has close,
even fine spiral cords with very sharp
axial striation in the intervals. Upward, towards the shoulder, the striae slowly retract. The
aperture is extremely narrow. The inner
lip is excavated in its lower fourth (1).
Length (truncated) 33, diam. 9.5 mm.; 5 ½
whorls remaining.
Type No. 2550, A. N. S. P.
This species, C. gabbi and C. pernodosus,
were lumped by Gabb under
C. orbignyi Audouin, a recent species inhabiting the Eastern Seas. C.
gracilissimus Guppy, from the Oligocene of Jamaica, is closely allied, but it is a distinct species,
with wide, flat, revolving costae
(1).
C. larvatus is narrower than C. tortuosostriatus Toula, and
differs conspicuously in contour.
Toula's species has more resemblance to C.
gracilissimus Guppy.
(1)
|
|
|
Conus larvatus (2)
Plate
XXI fig.
10: mm. 33,0 Oligocene
– Santo Domingo |
Conus orbignyi (Audouin, 1831)
Holotype
MNHN mm.
53,5 x 20 China |
Bibliografia Consultata
·
(1) - Pilsbry,
H. A., and Johnson, 1917. Oligocene Fossils from the Neighborhood of Cartegena,
Columbia, with Notes on Some Haitian Species. Proceedings of the Academy
of Natural Sciences of Philadelphia, 69
·