For instance, this is without a doubt a ranid crab of some sort:
Though I have never seen any crab with such a regal looking plant on its carapace before. It also appears to have four eyestalks.
Here we have a slipper lobster:
And a spiny lobster with antennae so spectacular it required a special fold-out plate!
And, oh yeah, a mermaid. With tiny little arms.
The Christie’s auction listing notes:
Renard never visited the East Indies and was completely reliant on information supplied by Fallours and other returning travellers, and, clearly worried by brilliant colours, fantastic shapes and habits of his subjects, felt it necessary to include affidavits from various eye-witnesses testifying to the accuracy of the depictions. Despite these declarations, his work was dismissed at the time as being largely fantasy. However, writing over one hundred years later, Bleeker remarked that, 'Although these figures are partly exaggerated and partly unrecognizable, it later proved that practically every one of them is based on a natural object'.
For more on this fascinating book (and the conviction that mermaids were real), see here.
Hat tip to Raven.
Poissons Ecrevisses et Crabes, de Diverses Couleurs et Figures Extraordinaires, Que L’On Trouve Autour Des Isles Moluques, et Sure Les Côtes Des Terres Australes
Glasgow University Library Special Collections Department Book of the Month, January 2002: Louis Renard,
Poissons, Ecrevisses et Crabes
Christie’s auction description