Amphibia, affinity of, to the ganoid fishes; vocal organs of the.
Amphibians, breeding whilst immature.
Amphioxus.
Amphipoda, males sexually mature while young.
Amunoph III., negro character of, features of.
Anal appendages of insects.
Analogous variation in the plumage of birds.
Anas.
Anas acuta, male plumage of.
Anas boschas, male plumage of.