One of my favorite crazy early images of sea-reptiles battling it out.
For ages and ages it seemed the prehistoric world had to be violent, violent, violent, action action action.
The only image more verboten than dinosaurs sitting around scratching their butts was any fantasy about how they had sex.
PS: The old complaint that the pterodactyls in this picture look and act too much like birds is now richly ironic. (They do seem too bat-like, however.)