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The term is not applicable to a particular zoological type, but it is customary to confine it to the 'Protozoa', 'Rotifera', or 'Wheel Animalcules'.

Certain minute organisms, familiarly known as "Wheel-Animalcules," or Rotifers, form the "class" Rotifera.

"You do not know much more than the names, then, of Infusoria, Rotifera, and Pedunculata, and such things?"

SPALLANZANI, in his experiments on the Rotifera, did not find that any survived after the sixteenth alternation of desiccation and damping, but paste-eels bore seventeen of those vicissitudes.

On Lacinularia socialis, a contribution to the anatomy and physiology of the Rotifera, in the "Transactions of the Microscopical Society" 4.