Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 PCLMOXARY CIRCULATION. With the appearance of lungs as respiratory organs (Dipnoi, Perennibranchiate Amphibia, larvae of Salamanders and Batra- chians) (fig. 58), the heart obtains a more complicated structure, in that the auricle becomes divided into a right and left division, the latter of which receives the arte- rialised blood, returning from the lungs by the pulmonary veins. The septum between the two divisions of
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 PCLMOXARY CIRCULATION. With the appearance of lungs as respiratory organs (Dipnoi, Perennibranchiate Amphibia, larvae of Salamanders and Batra- chians) (fig. 58), the heart obtains a more complicated structure, in that the auricle becomes divided into a right and left division, the latter of which receives the arte- rialised blood, returning from the lungs by the pulmonary veins. The septum between the two divisions of the auricle may, how- ever, remain incomplete (Dipnoi, Proteus). The advehent pulmon- ary vessels, the pulmonary arte- ries, always proceed from the iG. 57.—Diagram of the circulator/ organs of an osseous fish. r. ventricle ; Sa, aortic bulb with the arterial arches which carry the venous blood to the gills; Ao, dorsal aorta into which open the vessels from the gills or branchial veins Ab. N, kidney ; D, alimen- tary canal; Lk, portal circulation.
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