. Annals of natural history. Natural history; Botany; Zoology; Geology. 124 Prof. Ehrenberg on Fossil and Recent Infusoria, organization^, which after many years of observation have been gradually established, could not be brought into doubt by a single doubtful fact. The perfect organization of the wheel animalcules had been established beyond all question. With regard to Paramcccium Aurelia, this is one of those forms un- favourable to such observations; and it had been expressly observed by me that I myself had not been able to recognise the alimentary canal in all species of the various ge
. Annals of natural history. Natural history; Botany; Zoology; Geology. 124 Prof. Ehrenberg on Fossil and Recent Infusoria, organization^, which after many years of observation have been gradually established, could not be brought into doubt by a single doubtful fact. The perfect organization of the wheel animalcules had been established beyond all question. With regard to Paramcccium Aurelia, this is one of those forms un- favourable to such observations; and it had been expressly observed by me that I myself had not been able to recognise the alimentary canal in all species of the various genera; but on the other hand it was quite evident in a very considerable number of species and genera. I stated that in my present work this subject had been treated of in detail, and that those forms in which the relations are perfectly evident have been purposely enumerated. Some of these forms I then exhibited in the drawings, and concluded with the remark that the circular motion observed by Prof. Jones had already been treated of by others (for instance, Dr. Foeke), and had naturally been frequently observed by myself. The great contractibihty of the body of the animalcule was, to less practised observers, not seldom a cause of enigmatical phaenomena, of which con- tinued patient observation of the object would gradually bring the explanation. Thus, at times, the intestinal canal of the animalcule extends at the expense of the ventral sacs so far, that it occupies the whole space of the body, and then the de- voured substances, very similar to the ventral sacs, circulate in the whole body. Yours, &c. London, Sept. 15, 1838. (I) 1. 10 2. a> 3. Ideal figures of Loxodes Bursaria in various states of the extension of the alimentary canal, and its inner circular motion, not of the ventral sacs, but of the contents of the sacs voided into the canal. a the mouth, b the alimentary canal, c ventral sacs, w anal Please note that these images are extracte
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