- protruded,
keeled periphery, not
descending more rapidly, with a
distinct subperipheral sulcus. The
umbilicus is
widely open and U-shaped. The last
whorl does...
-
quarter of
their height and have
angular corners in
surface view. The
subperipheral utricles are
markedly inflated. The
overall geographic range of Halimeda...
- s**** is
rather convex, with 8 lirae, the
external one
bordering the
subperipheral channel, the
external 5
lirae are narrow, with broad,
smooth interstices...
- is wax
yellow with a
broad subsutural,
narrow submedian and a
broad subperipheral band of
golden brown.
These color markings make this
species different...
-
length measures 11.5 mm. Its
color is
light wax yellow, with a
supra and
subperipheral light chestnut band,
separated by a very narrow, dark wax
yellow peripheral...
-
equally spaced but grow
successively weaker. The
peripheral and
first subperipheral channel are
equal to
those on the spire. All are
rendered pitted by...
- deep, wide
channel across which the ribs
extend feebly to the
first subperipheral keel. The base of the s**** is
rather long and well rounded, marked...
- wide as the
spaces that
separate them. On the rest of the
turns the
subperipheral cord
comes into the
suture and on the
penultimate whorl forms a well-developed...
-
spirals of
which three more
spaced ones, at a
larger distance from the
subperipheral spiral, and 9 more
central spirals,
which are flatter, at
subequal distances...
-
certainly not be
considered to be the
ancestor species. The
presence of a
subperipheral belt much the same as in
Protatlanta souleyeti, on the
other hand, demonstrates...
