Conus gabbi
(Pilsbry & Johnson, 1917)
Description.
The shell is rather
slender, stoutly fusiform, with a concavelyconic spire of about 11 whorls; all
post-embryonic whorls have a tubercular keel projecting above the
suture. Upper surface of each whorl
is slightly concave, with about 5 unequal spiral threads crossed by prominent, arched, unegual striae.
Below the shoulder of the last whorl
the slope is at first convex, becoming slightly concave in the lower part. It is sculptured with
about 37 smooth, rounded spiral ribs
narrower than their intervals, which are elegantly cancellated by close raised axial threads. The
aperture is rather narrow throughout
(1).
Length 43, diam. 17.5 mm.; length of aperture 35
mm.
The number and spacing of the spiral ribs is
somewhat variable. In one?
specimen 35 mm. long there are only 24 spiral ribs. Conus tortuosostriatus Toula (1911), from the Panama
Canal, resembles this species
somewhat, but it has fewer and flattened spirals, and there are .some fine spiral threads in
the furrows. It seems also to be
more contracted in the lower part (1).
The type and four other specimens are No. 2553, A.
N. S. P.
(1)
In Bowden specimens of Conus
gracilissimus the spiral cords are flattened and slightly
wider than their intervals. In C. gabbi they are much narrower than the intervals
and not at all flattened. This is
not a matter of age. We have not seen the Bowden species from Santo Domingo (2).
|
|
Conus gabbi (2)
Plate
XXI fig.
8: mm. 33,0 fig.
9: mm. 42,5 x 17,5 Oligocene
– Santo Domingo |
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
·