Cypraea caputserpentis Linnaeus, 1758. (Synonyms: Cypraea caputanguis Philippi, Melvill, 1888; C. caputcolubri Kenyon, 1898; C. caputserpentis caputophidii Schilder and Schilder, 1939.) Length, 30 mm; diameter, 22 mm; height, 14 mm. Shell: broadly oval; solid; dorsum reticulated brown and white, sides brown. Sides: sloping. Aperture: wide, curved posteriorly, dilated anteriorly; teeth extending partially on to base. Color: dorsum reticulated brown and white, often with a white mantle line; sides deep brown, base lighter; teeth white, interstices dull orange. Animal: mantle olive-brown splashed with yellow and green; papillae conical and dendritic usually tipped with red. These cowries are the commonest species in the genus in the Hawaiian Islands, and are found in shallow water under loose rocks and boulders along the shoreline and in crevices at the seaward edge of solution benches and fringing reefs. C. caputserpentis has been reported from Pleistocene fossil deposits on Oahu (Ostergaard, 1928) and Molokai (Ostergaard, 1928). The Hawaiian shells are distinguished from Indian Ocean and Pacific Ocean forms by their shorter length, relatively greater height, larger number of teeth, narrower aperture, darker base and teeth interstices, and anterior terminal spots (Griffiths, 1959).