Formed from the Strombus, being distinct from it by not having the canal
at the base shortened or truncated. It greatly resembles the
Rostellaria, but the sinus of the right margin is distant from the body.
From its digitation or long recurved claws it has often been called the
Spider Shell.
Shell oblong-ovate, ventricose, canal elongated, attenuated, and often
closed; right margin dilating by age into an expanded, digitated wing,
attached to and covering a short spire, with a sinus in the lower part
not contiguous to the body.
Pteroceras truncata.
P. lambis.
P. millepeda.
P. pseudoscorpio.
P. scorpio.
P. aurantia.
P. chiragra.
_P. chiragra._ The Devil’s Claw. Pl. 28, fig. 3.
Tuberculated, with six digitated, canaliculated rays, closed in the
adult shell; outer lip internally striated.
_P. scorpio._ The Scorpion Pteroceras.
Species with digitations on the external edge, varying in number from
six to ten.