. The biology of marine animals. Marine animals; Physiology, Comparative. a. l*-0'6mrn-»| Fig. Orientation of the Larva of Arenieola in a Light Beam Arrows indicate direction of the light rays. The larva swims towards the light source in a spiral course. At d the light is changed from m to n, and the animal aligns itself to the new light source. (Lower right) enlarged view of the head, showing paired ocelli. (From Mast (105).) In species with statocysts, both statoreception and photoreception are involved in regulating the response. The mechanism of the dorsal light re- action of Palaemo
. The biology of marine animals. Marine animals; Physiology, Comparative. a. l*-0'6mrn-»| Fig. Orientation of the Larva of Arenieola in a Light Beam Arrows indicate direction of the light rays. The larva swims towards the light source in a spiral course. At d the light is changed from m to n, and the animal aligns itself to the new light source. (Lower right) enlarged view of the head, showing paired ocelli. (From Mast (105).) In species with statocysts, both statoreception and photoreception are involved in regulating the response. The mechanism of the dorsal light re- action of Palaemon is depicted in Fig. Palaemonis a prawn that possesses statocysts; in normal posture its dorsal surface is kept uppermost, what- ever the direction of incident light. When an intact animal is held obliquely it makes pushing movements with its lower limbs that would tend to return it to the normal position. Quite otherwise is the behaviour of an animal which has been deprived of its statocysts. When turned over on its side so that its back is towards a source of lateral light, it maintains a symmetrical position without attempting to resume an upright 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 Nicol, J. A. Colin (Joseph Arthur Colin), 1915-. New York, Interscience Publishers
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Keywords: ., bookcentury1900, booksubjectmarineanimals, booksubjectphysiology
