A. gibbosa, number of arms, [453];

eggs of, [463];

development of, [609], [610] f., [617];

A. wega, [459]

Asterinidae, [455], [458], [463]

Asternata, [554]

Asteroid stage in the development of Ophiuroidea and Echinoidea, [613], [622]

Asteroidea, [430], [431] f.;

compared with Ophiuroidea, [477] f.;

compared with Echinoidea, [503], [558];