. The biology of Stentor. Stentor. FUSION MASSES OF WHOLE STENTORS 209 doublet contract independently as Balbiani (1891b) first described. Doublets generally show the single conical shape ending in one holdfast, but there are two contractile vacuoles, two macronuclear. Fig. 58. Conversion of doublets to singles. A. Doublet becomes single by removing one of the primor- dium sites or major loci of stripe contrast. On reorganizing, both sets of original mouthparts are resorbed and the excised is not reconstituted. B. Spontaneous conversion, in which one (x) of the two original loci of stri
. The biology of Stentor. Stentor. FUSION MASSES OF WHOLE STENTORS 209 doublet contract independently as Balbiani (1891b) first described. Doublets generally show the single conical shape ending in one holdfast, but there are two contractile vacuoles, two macronuclear. Fig. 58. Conversion of doublets to singles. A. Doublet becomes single by removing one of the primor- dium sites or major loci of stripe contrast. On reorganizing, both sets of original mouthparts are resorbed and the excised is not reconstituted. B. Spontaneous conversion, in which one (x) of the two original loci of stripe contrast disappears and the specimen reorganizes singly, also achieving a single macronuclear chain. C. Isolated head end of doublet shows first a proportionate shortening of the membranellar bands, then cutting out and resorption of one of the mouths and obliteration of one primor- dium site, becoming a normal stentor even without primordium 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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