[13] Davaine in Annales des Sciences Naturelles, 1858, x. p. 335.
[14] Spallanzani: Tracts on the Natural History of Animals and Vegetables: Translated by Dalyell, ii. p. 129.
[15] In some cases of monstrosity, these organs are transposed, the liver being on the left, and the pancreas on the right side. It was in allusion to a case of this kind, then occupying the attention of Paris, that Molière made his Médecin malgré Lui describe the heart as on the right side, the liver on the left; on the mistake being noticed, he replies: “Oui, autrefois; mais nous avons changé tout cela.”
[16] The term zöoid was explained in our last.
[17] In the cuttlefish there is the commencement of an internal skeleton in the cartilage-plates protecting the brain.
[18] It is right to add, that there are serious doubts entertained respecting the claim of a star-fish to the possession of a nervous system at all; but the radiate structure is represented in the diagram; as it also is, very clearly, in a Sea-anemone.
[19] Protozoa, from proton, first, and zoon, animal.