. Animal physiology. Physiology, Comparative; Physiology, Comparative. CIRCULATION IN MOLLUSCA. 229 trunk//. By this trunk it is distributed to the gillse; and thence returns to the heart, after it has undergone aeration. Now if a second heart had been placed on the trunk//, just as it is about to subdivide for the distribution of the blood to the gills, the circulation would have been analogous to that of Birds and Mammalia. There is great variety in the position of the gills in Molluscous animals, and a corresponding variety in the situation of the heart, which is usually placed near them. I
. Animal physiology. Physiology, Comparative; Physiology, Comparative. CIRCULATION IN MOLLUSCA. 229 trunk//. By this trunk it is distributed to the gillse; and thence returns to the heart, after it has undergone aeration. Now if a second heart had been placed on the trunk//, just as it is about to subdivide for the distribution of the blood to the gills, the circulation would have been analogous to that of Birds and Mammalia. There is great variety in the position of the gills in Molluscous animals, and a corresponding variety in the situation of the heart, which is usually placed near them. In the Doris the gills are arranged in a circular form, round the termination of the intestinal canal; but in many Mollusca they form straight rows of fringes on the two sides of the body. In these last, the heart not unfrequently has two auricles; but these are not analogous to the two auricles of Reptiles; for each has the same function with the other—the reception of the blood from the gills of its own side. 291. There is a very interesting variety in the conformation. Fig. 134 a cs vv Apparatus of Cuttle-fish. of the heart in the Cephalopoda, or Cuttle-fish tribe ; which seems to form a connecting link between the plan of the circu-. 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 Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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