Estheria obliqua, one of the Conchostraca. 1911. Conchostraca.

描述：

Estheria obliqua, one of the Conchostraca. A: Shell of female from the side; B, male from the side, after removal of one valve of the snell. a' Antennule; a', antenna; ad, muscle which draws together the valves of the shell; f, tail fork; md, mandible