. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. 218 CH. ROUILLER, E. FAURE-FREMIET AND M. GAUCHERY. Fig. 5. Fruntonia marina. Longitudinal section of some plia- ryngeal proteic fibres (F). M, mitochondria. Magnification X 34,000. By their structure and their position, these fibres are readily comparable to those which form the pharyngeal basket of Nassula. This fact should be remembered if one wishes to study the comparative morphology and evolution of the Ciliates. We have elsewhere described similar fibres found around the buccal infundib
. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. 218 CH. ROUILLER, E. FAURE-FREMIET AND M. GAUCHERY. Fig. 5. Fruntonia marina. Longitudinal section of some plia- ryngeal proteic fibres (F). M, mitochondria. Magnification X 34,000. By their structure and their position, these fibres are readily comparable to those which form the pharyngeal basket of Nassula. This fact should be remembered if one wishes to study the comparative morphology and evolution of the Ciliates. We have elsewhere described similar fibres found around the buccal infundibulum of the peritrichous Ciliates (5). From the cytological point of view, we see that all the fibres examined are of proteic nature. They are rigid and elastic, birefringent and built up of elementary fibrils arranged to form a paracristal- line structure. The elementary fibrils seem to be of a fairly constant diameter, between 150 and 200 A. Each of them must be considered as an already complex macromolecular entirety. The elementary fibrils are always in a parallel arrangement but their mutual ordering may be either loose and irregular, or tight and regular in the transverse plane with respect to a definite pattern. In fact we have a system which we may name smecto- nematic since the fibrils are arranged in a parallel manner (as in the nematic mesomorphic states) but in addition on a series of parallel planes (the latter bringing to mind a smectic mesomorphic state). Unfortunately, there is some doubt as to the origin of the fibres, that is to say their formation process, their growth, their assemblage, their pattern-making. The case of Frontonia indicates a possible relation- ship with the ciliary rootlets similar to those previ- ously described in Stentor (3). It is not sure whether this is so with Nassula and Chlamydodon. Dysteria by the development of the pharyngeal tube and the reduction of the protein rods to two large stylets surmounted around the mouth by two com- pl
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