. Animal physiology. Physiology, Comparative; Physiology, Comparative. GENERAL STRUCTURE OF MOLLUSCA. 63. Fig. 14. s d f -Anatomy of the Snail. is a very large mass, surrounding the stomach and intestine. The heart is seen h v ap p r at h; and from it , is seen to proceed a large vessel, a p, l that ramifies up- on the walls of a cavity, p, which answers to the ar lungs of higher animals; this ca- 0 vity is separated from the other organs by a kind of diaphragm or partition, d, which is here turned to one side. At ar is shown the artery which proceeds from the heart, to convey blood to the gen
. Animal physiology. Physiology, Comparative; Physiology, Comparative. GENERAL STRUCTURE OF MOLLUSCA. 63. Fig. 14. s d f -Anatomy of the Snail. is a very large mass, surrounding the stomach and intestine. The heart is seen h v ap p r at h; and from it , is seen to proceed a large vessel, a p, l that ramifies up- on the walls of a cavity, p, which answers to the ar lungs of higher animals; this ca- 0 vity is separated from the other organs by a kind of diaphragm or partition, d, which is here turned to one side. At ar is shown the artery which proceeds from the heart, to convey blood to the general system. At o is seen the ovarium, in which the eggs are formed; this ocupies the highest part of the shell; but it has a canal which terminates near that of the intestine. And lastly, at v is pointed out a gland that secretes the viscous or slimy fluid, with which the body of the animal is covered; and this is carried out by the canal cv. 77. Thus it is seen that,—whilst the body of an Articulated animal may be compared to that of a man, in whom the appa- ratus of nutrition (contained in the chest and abdomen) is of the smallest possible size, but whose limbs are strong, and his move- ments agile,—the body of a Mollusc resembles that of a man ' whose god is his belly,' his digestive apparatus becoming enor- mously developed, whilst his limbs are feeble, and his movements heavy. Such varieties, in a greater or less degree, are continu- ally presenting themselves to our notice. 78. The nervous system of the Mollusca generally consists of a single ganglion or pair of ganglia, which are placed in the head, or (when that is deficient) in the neighbourhood of the mouth ; and of two or more separate ganglia, which are found in different. 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 Carpenter, William Be
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