Shell composed of two testaceous valves, enclosed in a mantle or
membranous bag, which is prolonged and terminated in two fleshy tubes
formed like ears, one of the two having a lateral opening.
Otion Cuvierii.
Otion Blainvillii.
_O. Cuvierii._ Cuvier’s Otion.
Answers to the above.
_O. Blainvilli._ Blainville’s Otion.
Ash coloured; the body and ears spotted with black.
CLASS III.
CONCHIFERA.