Algae, destructive to shell of tortoises, [357]

Allantois, an embryonic outgrowth from the posterior part of the gut, acting as a respiratory organ, [278]

Alligator, [450], [466] f.;

A. mississippiensis, [467] f.;

skull, [468];

nesting, [469];

A. sinensis, [471]

Alligator Turtle, [340]

Allopleuron hofmanni, [380]

Allosaurus, [422]