. The biology of Stentor. Stentor. REORGANIZATION 93 not resorbed but simply rises and flattens out to the level of the adoral field with whose stripes its own are continuous. As the primordium migrates forward and carries with it some ecto- plasmic striping to the right, new and old frontal-field stripes are brought together, but though homopolar they do not join. Instead, the anterior ends of the new stripes are pulled over to the point where the old mouthparts dissolved and the resulting frontal field therefore shows two swirls of striping (Fig. 2i).This doubleness is an enduring character
. The biology of Stentor. Stentor. REORGANIZATION 93 not resorbed but simply rises and flattens out to the level of the adoral field with whose stripes its own are continuous. As the primordium migrates forward and carries with it some ecto- plasmic striping to the right, new and old frontal-field stripes are brought together, but though homopolar they do not join. Instead, the anterior ends of the new stripes are pulled over to the point where the old mouthparts dissolved and the resulting frontal field therefore shows two swirls of striping (Fig. 2i).This doubleness is an enduring character which identifies stentors that have under- gone reorganization, a sign which is often useful in following the performance of experimental animals. Sometimes one finds stentors with three disjunctive systems of striping in the frontal field, indicating that these animals have twice reorganized, though they may be proters from an ensuing Fig. 21. Anterior end view of a coeruleus which had reorganized twice, showing muhiple pattern of frontal field. After the reorganization primordium is nearing completion, a secondary stripe multiplication occurs just below the newly- forming oral region quite as in the opjsthe of dividers, as pointed out by Schwartz. This stripe increase will form a new ramifying zone and completes the reorganization process. It now remains to report what has been done toward analyzing the sequential events in reorganization and above all to inquire into its possible signifi- cance for the life of the 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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