Arcella, [51], [53];

A. vulgaris, [55]

Archaeocidaridae, [557], [558]

Archaeocyte, [171]

Archaster, [467];

A. bifrons, [467]

Archasteridae, [456], [466]

Archenteron, definition of, [604]

Archer, on Protozoa, [45];

on Heliozoa, [71]