. The biology of Stentor. Stentor. Fig. 29. Regenerated *S. coeruleiis of near minimum size, a: Tiny and large stentors drawn to same scale. Note that mem- branelles are of same width and length in both. Pigment stripes are also of similar widths, hence minute form had only about 20 as compared with 100 for the large animal, b: Enlarged view of regenerant, which has but one macronuclear node and very few stripes in the frontal field. If units of ectoplasmic structure in ciliates, such as oral cilia, body cilia, and trichocysts, are of a standard, nearly invariant size for any species of ciliat
. The biology of Stentor. Stentor. Fig. 29. Regenerated *S. coeruleiis of near minimum size, a: Tiny and large stentors drawn to same scale. Note that mem- branelles are of same width and length in both. Pigment stripes are also of similar widths, hence minute form had only about 20 as compared with 100 for the large animal, b: Enlarged view of regenerant, which has but one macronuclear node and very few stripes in the frontal field. If units of ectoplasmic structure in ciliates, such as oral cilia, body cilia, and trichocysts, are of a standard, nearly invariant size for any species of ciliate (cf. Bonner, 1954; Ehret and Powers, 1959) this should simplify the problems of growth; for one would then need only to explain their increase in number, and further hypothesis regarding their adaptive size would not be necessary. This seems to be one of the crucial theoretical points involved in these small-fragment studies. The other resides in the amazing fact that organic form is largely independent of size and, outside the limitation just mentioned, it is possible for stentor shapes and. 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 Tartar, Vance, 1911-. New York, Pergammon Press
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