Aspidogaster conchicola is a form not uncommon in Anodon, Unio and certain fresh-water Gastropods.
(2) View from the ventral surface of an Anodon with its foot expanded and issuing from between the gaping shells.
(4) Diagrammatic section of Anodon to show the course of the alimentary canal.
The concrescence, then, of the free edge of the reflected lamellae of the gill-plates of Anodon is very extensive.
The organization of the oyster, as compared with that of a typical lamellibranch such as Anodon, is brought about by the reduction of the anterior part of the body accompanying the loss of the anterior adductor, and the enlargement of the posterior region.