. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. CHAPTER VIII EXPERIMENTS ON MOLLUSKS The literature on the functions of the central nervous system of Mollusks is extremely meagre. It is nevertheless valuable, as it furnishes us with further proofs of the theory that the simple and rhythmical spontaneity, as well as reflex processes, do not depend upon the brain or specific peculiarities of the ganglia. A Gastropod whose brain (g, Fig. 33) has been removed continues to move spontaneously. Stei- ner has observed this in a transparent pelagic spec
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. CHAPTER VIII EXPERIMENTS ON MOLLUSKS The literature on the functions of the central nervous system of Mollusks is extremely meagre. It is nevertheless valuable, as it furnishes us with further proofs of the theory that the simple and rhythmical spontaneity, as well as reflex processes, do not depend upon the brain or specific peculiarities of the ganglia. A Gastropod whose brain (g, Fig. 33) has been removed continues to move spontaneously. Stei- ner has observed this in a transparent pelagic species of snail, Pterotrachea, FIG. 33. SCHEMATIC REPRESENTATION OF that IS about TO cm. THE CENTRAL NERVOUS SYSTEM OF A SNAIL (PALUDINA VIVIPARA). g, brain ; P, pedal ganglion. (Modified after Leydig.) transformed into a swimming organ. Neither one- nor two-sided de- struction of the supracesophageal ganglion has the slightest influence upon the character and the 128. p •s (0- The foot of this snail has been. 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 Loeb, Jacques, 1859-1924. New York, G. P. Putman's Sons; [etc. , etc. ]
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