-
symmetrical smooth whorls,
bluntly pointed,
distinctly marked off from
brephic stage. The
spiral ribs are very
obscure on
earlier whorls, 4 on first,...
-
composed of
three smooth whorls, the
suture of
which is marginate. In the
brephic stage the
margination is much accentuated, and at a
later period of growth...
-
longitudinally ribbed.
Beyond the
sinuous fracture denoting the
commencement of the
brephic stage these costae suddenly cease and give way to
spiral lineations, with...
- s****
attains 6.6 mm. It
differs from S.
Himaeformis in that it
lacks a
brephic sculptural stage, and
instead develops directly from the
protoconch to...
-
obtusely keeled medially. This keel
develops into a
strong feature in the
brephic and
neanic stages, but on
approaching the
adult is not so
clearly marked...
-
regularly coiled,
bluntly pointed, and not
distinctly marked off from
brephic stage. The
first whorl shows 3,
following whorls with 4,
subequal spirals...
- of ornament,
terminating abruptly at its
junction with the s**** in the
brephic stage. The s****
contains eleven whorls. The
suture is
canaliculate and...
- and
vertically striated It
terminates abruptly against the s**** of the
brephic stage,
which is longitudinally,
obliquely costated and marginate. The aperture...
-
longitudinally costate and
subnodose at the periphery, and this
continues up to the
brephic stage,
where it
gives way to the bold
spiral lirae which form the sole...
-
striae developing into well-defined
sulcations as the s**** p****es from the
brephic to the
neanic stages of growth. The s**** as a
whole is elongate, the aperture...
