Proterospongia
Volvox
Diagram of amœba
Early Life-History of the Salmon
Nautilus
The Skull and Brain-Case of Pithecanthropus
Skeletons of the Gibbon, Orang, Chimpanzee, Gorilla, Man
Surinam Toad (Pipa Americana) with Young Ones Hatching out of Little Pockets on her Back
An Eight-Armed Cuttlefish or Octopus Attacking a Small Crab
Wing of a Bird, Showing the Arrangement of the Feathers