. The biology of Stentor. Stentor. 92 as THE BIOLOGY OF STENTOR any free nodes forward to a position directly under the developing primordium and he claimed that this is a precise and invariant event in reorganization, though neither Schwartz nor I confirm this. Essentially, the macronucleus clumps and renodulates without b ^ c ^ d Fig. 20. Course of reorganization (S. coeruleus). a: Morphologically complete animal shown with stage-3 primordium. b: Stage-4 anlage intirriately joining with original membranellar band, c: During stage-6 of primordium develop- ment the old band between
. The biology of Stentor. Stentor. 92 as THE BIOLOGY OF STENTOR any free nodes forward to a position directly under the developing primordium and he claimed that this is a precise and invariant event in reorganization, though neither Schwartz nor I confirm this. Essentially, the macronucleus clumps and renodulates without b ^ c ^ d Fig. 20. Course of reorganization (S. coeruleus). a: Morphologically complete animal shown with stage-3 primordium. b: Stage-4 anlage intirriately joining with original membranellar band, c: During stage-6 of primordium develop- ment the old band between joining point and mouthparts, together with those parts, is resorbed. d: New mouthparts and addition to membranellar band moving into place and carrying new fine stripes into the frontal field which now shows a double pattern, 2 swirls. Since the granular carbohydrate reserves in the posterior end of the cell undergo remarkable shifts in division, their behavior during reorganization should be noted. Weisz reported that the granules remained in place without change, but I observed that generally they diffuse forward under the ectoplasm though not separating into two groups (Tartar, 1959a). The chief resemblance between reorganizers and dividers is that in both cases a primor- dium is formed although feeding organelles are already present. In the tendency of the carbohydrate reserves to migrate there is also a slight similarity, but points of distinct difference are that no second contractile vacuole is formed during reorganization (Johnson, 1893) and of course no fission line. The anterior end of the anlage now fuses with the original membranellar band, often causing a slight deflection where it joins; and the section of the old band between this juncture and the mouthparts then dedifferentiates and is resorbed along with the last traces of the gullet. The original oral pouch apparently is. Please note that these images are extracted from scanned page images that may have been
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