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creature, consequently, if it be actually an independentanimal, must be referred to the Infusoria. Its body iscontractile, and furnished on one side with an activelyvibrating ciliated lobe. Gruby (Comptes rendus, 1843, p.1134 ; or Annales des Sci. Nat. 1844, tom. i, p. 104, PI. 1,B; or Froriep’s neue Notiz. Nr. 604, 1843, p. 152) hasnamed this hsematozoon, which he discovered in the bloodof adult Frogs, Trypanosoma sanguinis. He describes theanimal as having an elongated flattened body, with a fila-mentary prolongation at each end, it is jagged at one lateralmargin, and rotates on its longitudinal axis. The lateralmargin appears jagged only in consequence of an opticaldelusion during the movements of the laterally attachedciliary fringe.
Mayer (De organo electrico et de hsematozois, 1843, p.10, Tab. iii, Figs. 10, 11) saw in the blood of the green Grass-frog, two different animalcules swimming about actively,one of which ( Paramcecium loricatum, or costatum, May.) issaid to be oval, obliquely striated, and furnished anteriorlywith cilia, whilst the other ( Amoeba rotatoria, May.) pre-sented a slender, elongated, very mutable body, furnishedwith a lateral, rotorial, ciliary apparatus. Both forms cer-tainly belong to the Trypanosoma described by Gruby, towhich also it is most probable that the Entozoon found byIlyrtl (Midler’s Archiv, 1843, p. 238) in the lateral canalof a Trout , and which corresponded with the worm dis-covered by Valentin in the blood of that fish, should bereferred.
Will (Horse tergestinse, 1844, p. 78, et 81) could almostalways perceive in the cavities of the stomach, the respi-ratory tubes and sexual organs of Diphyes Kochii, whichcommunicate with each other, elongated Entozoa pointedat each end, which were smooth externally and rather flat-tened, and varied in size from ¥ l 5 th to —tli of a line. Theyexhibited a very active serpentine motion, and swam about,especially in the respiratory cavity with great facility, andattached themselves also by one extremity of the body, which
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