. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Biol inninesccnce 665 Light jiroduction among the chordatcs is restricted to the protochordates and hshcs. A kiminous slime is produced, for example, bv species of Valano- glussxis. Among the tunicates, the best known example of a luminescent form is Pyrosovia, a colonial species. The organism luminesces on stimulation, and a wave of photogenic acti\ity spreads out o\'er this colonial ;''' Light definitely operates as a stimulus in this spread of activity from one luminescing indix'idual of a colo
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Biol inninesccnce 665 Light jiroduction among the chordatcs is restricted to the protochordates and hshcs. A kiminous slime is produced, for example, bv species of Valano- glussxis. Among the tunicates, the best known example of a luminescent form is Pyrosovia, a colonial species. The organism luminesces on stimulation, and a wave of photogenic acti\ity spreads out o\'er this colonial ;''' Light definitely operates as a stimulus in this spread of activity from one luminescing indix'idual of a colony to adjacent ones. Thus the wave of activity has been reported to pass from one colony to another even when glass walls separate the two colonies. Similarlv, acti\itv mav be induced in a colonv by using a light flash as a stimulating agent. A. B C Fig. 252. A female larva of the beetle, Phengodes. A, Dorsal view. B, Lateral view. C, A luminous specimen in darkness (From Harvey 1940).''^ The elasmobranch and especially the teleost fishes have numerous lumi- nescent representatives, particularly among those inhabiting the depths of the seas. In some, like Photohlefharon, Anomalous, Physiciihis, EqiinJa, and Monocentris, the light is due to the presence of symbiotic bacteria in special organs found in the cheeks or lower ' In others, , Malacocephalus, luminescent granules, possibly bacteria, are expelled from ventral sacs onto the ventral surface of the body when the fish is excited. Still others, as Astro- nesthes and Stomias, possess well-differentiated eye-like organs with lenses and pigmented cups. In some fishes the appearance of light on stimulation is. 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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