. Animal physiology. Physiology, Comparative. 252 CIRCULATION IN GASTEROPODA AND CEPHALOPODA. is distributed to the gills e; and thence it returns to the heart, after ha^dng undergone aeration. J^ow 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 Mammals. There is a great variety in the position of the gills in Mollus- cous animals, and a corresponding variety in the situation of the heart, which is usually placed near them. In the Doris tlie gills
. Animal physiology. Physiology, Comparative. 252 CIRCULATION IN GASTEROPODA AND CEPHALOPODA. is distributed to the gills e; and thence it returns to the heart, after ha^dng undergone aeration. J^ow 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 Mammals. There is a great variety in the position of the gills in Mollus- cous animals, and a corresponding variety in the situation of the heart, which is usually placed near them. In the Doris tlie gills are arranged in a circular manner, round the termina tio]i of the intestinal canal; but in many Mollusca they form straight rows of fiinges 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 Eeptiles; for each has the same function with the other—the reception of the blood fi'om the gills of its own side. 291. There is a very interesting variety in the conformation of the heart in the Cephalopoda, or Cuttle-fish tribe; which. Fig. 110.—Circulating Apparatus of Cuttle-fish. seems to form a connecting link between the plan of the cir- culation that prevails among the Mollusca in general, and that. 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 : H. G. Bohn
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