"Cerion degeneri new species
(Fig. 4-6)
Description. - Shell cylindrical, smooth to finely ribbed, and rather light in structure. Umbilical chink small and partially covered by the reflected lip. Color a dull milky-white with rather numerous axial bars of reddish-brown. Interior of aperture a rather dull whitish-brown. Parietal tooth is strong and follows back about one-half whorl. Columellar tooth is small and relatively inconspicuous and follows back about one half a whorl. Sculpture consists of rather fine and irregular growth lines which, on a very few specimens, become rather well developed on the body whorl, forming definable ribs. No spiral sculpture. Whorls 10, slightly convex, nuclear whorls (2½) china-white, smooth to minutely ribbed. Remaining whorls generally smooth though an occasional specimen shows ribbing on the body whorl. Spire extended, the first 7 whorls forming an acute apex, produced at an angle of 70°. Remaining whorls nearly parallel-sided. Aperture subovate with a thickened though narrowly reflected lip. The lip is particularly thickened over the umbilical chink. Fully mature specimens have a strongly developed ridge which connects the two lip extremities.
|
Length |
. Width |
Aperture |
||
|
--------- |
--------------- |
------------------- |
||
|
22.8 |
9 |
5.8 X 4.1 mm. |
Holotype | |
|
28.5 |
10 |
6.5 X 4.3 |
" |
Paratype |
|
24.2 |
8.6 |
7.0 X 4.5 |
" |
" |
|
24.3 |
9.5 |
6.5 X 4.2 |
" |
" |
|
21.8 |
8.1 |
6.0 X 4.0 |
" |
" |
Holotype. -
Remarks. - This species does not appear to be closely related to any other on the