Thomson, Sir William, [136].
Thoracic fishes, [39].
Thorax of crustaceans, [79].
Thylacine, [67].
Tierra del Fuego, [192].
Tiger, sabre-toothed, [110].
Time required for evolution, [128].
Tope, [172].
Trabeculæ cranii, [172].
Transitional forms, [128].