Anaides = Autodax (q.v.), [107]

Anal sacs of Chelonia, used as additional respiratory organs, [330]

Anarosaurus pumilio, [477]

Anchisaurus, [415], [417], [421];

skull of A. coelurus, [421]

Ancistrodon, [645];

A. contortrix, [646], [646];

A. halys, [645];

A. himalayanus, [645];

A. piscivorus, [645], [645]