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 PIG. 61.—Diagram of the circulation in an animal with a completely separated right and left ventricle, and a double circulation (after Huxley). Ad, right auricle receiv- ing the superior and inferior venae cavffi, Ves, and Vci; Dth, thoracic duct, the main trunk of the lymphatic system ; Ad, right auricle ; Vd, right ventricle ; Ap, pulmonary artery; P, lung; Vp, pulmon- ary vein ; At, left auricle; T's, left ven- tric
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 PIG. 61.—Diagram of the circulation in an animal with a completely separated right and left ventricle, and a double circulation (after Huxley). Ad, right auricle receiv- ing the superior and inferior venae cavffi, Ves, and Vci; Dth, thoracic duct, the main trunk of the lymphatic system ; Ad, right auricle ; Vd, right ventricle ; Ap, pulmonary artery; P, lung; Vp, pulmon- ary vein ; At, left auricle; T's, left ven- tricle ; Ao, aorta; D, intestine ; L, liver; Vp', portal vein; Lv, hepatic vein. FIG. G2. — Diagram of the great arteries of a mammal with reference to the five embry- onic arterial arches (after Bathke). c, common carotids ; c', external carotid ; c', inter- nal carotid; A, aorta. Ap, pulmonary artery; Aa, aortic arch. Inner surfaces also may be con- cerned in this exchange, especially those of the digestive cavity and intestine, 01%%%%%%%%%%%%%%%% as in the Echi- nodernis, in which a separate vascular system is developed, the surface of the whole body cavity. Respiration in water obviou^y takes place under far more un- favourable conditions for the introduction of oxygen than does the direct respiration in air, because it is only the small quantity of
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