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Example text
According to Kahl (1935) the posterior cilia are strongly thigmotactic, coming to a stop when they touch something substantial. Along the ciliary rows it has been found that groups of cilia are stiff and pointed outward while the remainder of the ciliation is actively beating; and these have been called tactile spines, setae, or Tastborsten (Fig. 3). They may disappear and reappear. Hence Stein, who seems to have first noticed them, thought they could be withdrawn into the body. Johnson, with more probability, said that FIG.
They are not fixed in place but capable of a certain freedom of movement (Andrews, 1946) which Weisz (1949a) called Brownian motion. In all colored species the pigmentation is probably confined to these granules (though S. Felici was differently described), for there is not a second set of uncolored bodies. That cortical granules seem to be present in uncolored stentors indicates that they serve some purpose besides pigmentation. When pigmented, some granules can also be identified in the interior of the cell; and Weisz indicated this to be the main site of a putative metabolic function, the granules being stored, as it were, in the ectoplasm and loosed into the interior to be utilized during starvation and regeneration.
B. Side view. ) acicular and lobose pseudopodial processes, like a balloon anchored by ropes (Fig. 7B), the openings between which would preclude any suction. If forcibly detached, the holdfast remains somewhat intact for a while and is so sticky that if touched with a needle adherence is firm and immediate. But later, or when the animal detaches itself at will, the holdfast is withdrawn. Then, according to Andrews, its structural parts resume their former forms and functions, which would imply that the striping of the pseudopods again takes the form of the posterior cell wall and the aciculars transform back into cilia.