. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MARINE SAND-DWELLING CILIATES 67 The associated sulfur bacteria, rod-shaped and all of the same length, measure about 10 micra; they are attached to the dorsal surface of the ciliate infusorian body by one end, and arranged in a parallel manner like the bristles of a brush. That is a characteristic of the so-called Caulobacteria—the genus Pasteuria (Metschnikoff), for example. As is the case among others of this group, they divide longitudinally. The dark appearance of the bacteria of C. lanceolata is due to the presence in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MARINE SAND-DWELLING CILIATES 67 The associated sulfur bacteria, rod-shaped and all of the same length, measure about 10 micra; they are attached to the dorsal surface of the ciliate infusorian body by one end, and arranged in a parallel manner like the bristles of a brush. That is a characteristic of the so-called Caulobacteria—the genus Pasteuria (Metschnikoff), for example. As is the case among others of this group, they divide longitudinally. The dark appearance of the bacteria of C. lanceolata is due to the presence in their cytoplasm of highly refractile sulfur granules; in fact, these bacteria are really colorless, as are those of C. fistitlosa, whereas those of C. jascioJata show a pink color. It is known that the nuclei of the Centrophorella (Kahl, 1933, 1935; Faure- Fremiet, 1950) are very small; C. lanceolata shows five to six globular macronuclei about 4 micra in diameter, and some smaller FIGURE 3. Remanclla obtusa n. sp. View of the ciliated right side. M, mouth; N, double macronucleus with one micronucletis; V, Miiller's vesicles with refringent bodies. The association of the Centrophorella with the Caulobacteria is a perfectly constant character; in each case these bacteria are sulfur bacteria, but they differ in size and color with each species of Centrophorella. It would be interesting to de- fine the nature, specific or adaptively induced, of these differences. On the other hand, it is noteworthy that the bacteria constantly associated with a heterotrichous ciliate, Parablepharisina pelUtum Kahl, are quite different and do not contain Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). An
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