. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. '^^ ""^^^ ^ )a \h r-'4 V Fig. 102. Orientation of swimming Englena to light. From 1 to 2, light from direction of top of page; 2, direction of light reversed. The animal swerves to the dorsal side each time the receptor is shielded from the light by the eye spot. (Jennings, 1906.) Function in Orientation. The photoreceptor of Englena and related forms is a directional receptor by virtue of the pigment of the stigma. This orange- red pigment mass serves to shade the swelling of the base of the flagellum
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. '^^ ""^^^ ^ )a \h r-'4 V Fig. 102. Orientation of swimming Englena to light. From 1 to 2, light from direction of top of page; 2, direction of light reversed. The animal swerves to the dorsal side each time the receptor is shielded from the light by the eye spot. (Jennings, 1906.) Function in Orientation. The photoreceptor of Englena and related forms is a directional receptor by virtue of the pigment of the stigma. This orange- red pigment mass serves to shade the swelling of the base of the flagellum when illumination is on the "dorsal" surface and does not do so when illum- ination is from the opposite direction. When exposed to a single light source. 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 Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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