Helix janthina [marine snail]
Gullets of the Java swallow, Common swallow and Bl...
Figure representing stars in the Milky Way
Specimens of leeches
Ocythoe cranchii [winged argonaut], artist unknown
Forms of miners' safety lamp
Argonaut shell and eggs
Interior surfaces of the human oesophagus and stom...
Interior surfaces of the human stomach and duodenu...
Arcs of the distances of stars