PLECOCHEILUS undulatus.
Waved Pupa-snail.
Family Pupadæ. Guilding. Genus Carychium. Muller.
Sub-Gen. Plecocheilus. Guild.
Sub-Generic Character.
Animal hermaphrodite, snail-like; the head bilobed, and bearing four tentaculæ, two of which are long and terminated by the eyes; mandibles greatly lunated, with a small transverse mouth and a triangular cutaneous plate; mantle perforated. Eggs large, externally calcarious. Shell oval, ventricose, the two last spiral whorls very short, but elevated; aperture entire, elongated; outer lip thickened and reflected; inner lip thin, nearly obsolete; pillar with a strong compressed inflexed plate. Guilding.
Specific Character.
Shell irregularly and minutely corrugated, and longitudinally striated; marked beneath the olive epidermis with oblique, undulated, dark stripes.