Aetheospondyli, [497]

Aëtobatis, [465], [466];

spines, [177]

Agassiz, [558] n., [685] n., [720] n.

Ageniosus, [589];

A. valenciennesi, [589]

Agnathostomata, [145];

characters of, [147]

Agoniates, [575]

Agonidae, [700], [694]