. The biology of Stentor. Stentor. BEHAVIOR 25 6. The question of sensory cilia Certain of the body cilia behave differently from most. 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 Tast- borsten (Fig. 3). They may disappear and reappear. Hence Stein, who seems to have first noticed them, thought they could be wit
. The biology of Stentor. Stentor. BEHAVIOR 25 6. The question of sensory cilia Certain of the body cilia behave differently from most. 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 Tast- borsten (Fig. 3). They may disappear and reappear. Hence Stein, who seems to have first noticed them, thought they could be with- drawn into the body. Johnson, with more probability, said that. Fig. 3. Sessile body cilia as seen in S. roeseli, possibly sensory. (After Kahl, 1935.) they were only temporarily rigid cilia which could start again beating and only seemed longer than the others because they were stopped. He suggested a sensory function for the cilia in the rigid state because they are found mostly toward the anterior end where stimuli would presumably be most frequent. Since Johnson saw them both in coeruleus, which makes no case, and in roeseli which does, they are not uniquely correlated with case building. He found them most evident in the frontal view; and Kahl states that there is always one group of " bristles ", five to twenty in number according to the species, in each kinety directly under the membranellar 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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