. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. 494 THE SENSORIAL FUiVCTIONS. to the rays of the animal, and disposed in a circle round the central aperture or mouth, but occupying situations intermediate between each of the rays. A nerve is sent off from both sides of each ganglion, and passes along the side of the rays, each ray receiving a pair of these nerves. In the Holot/mria and Eclmius there is a similar chain of ganglia, encircling the oesophagus; and the same mode of arrangement prevails in all
. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. 494 THE SENSORIAL FUiVCTIONS. to the rays of the animal, and disposed in a circle round the central aperture or mouth, but occupying situations intermediate between each of the rays. A nerve is sent off from both sides of each ganglion, and passes along the side of the rays, each ray receiving a pair of these nerves. In the Holot/mria and Eclmius there is a similar chain of ganglia, encircling the oesophagus; and the same mode of arrangement prevails in all the bivalve Molhisca^ except that, besides the supra-cesophageal ganglion, 446 445 448. other ganglia are met with, in different parts of the body, distributing branches to the viscera, and connected with one another and with the oeso- phageal ganglia by filaments, so as to form witli them one continuous nervous system. There is one appropriated to the respiratory organs, the branchial; another to the foot, the pedal; others to the mouth and lips, the pharyngeal and labial; and another to the mantle, the palleal ganglion. In the Gasteropoda, which are furnished with a distinct. 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 Roget, Peter Mark, 1779-1869. London : W. Pickering
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