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 HEART OF INTEETEBEATE9. 61 'Ascaris), but also by the movements of other organs, , the alimentary canal (Cyclops). At a higher stage of development a rudiment of the central organ of the circulation, appears, in that a special section of the blood path acquires a muscular investment, and as a pulsating heart, comparable to a force and suction-pump. FIG. 52.—Male of Branchipus stagnalis with many- hea
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 HEART OF INTEETEBEATE9. 61 'Ascaris), but also by the movements of other organs, , the alimentary canal (Cyclops). At a higher stage of development a rudiment of the central organ of the circulation, appears, in that a special section of the blood path acquires a muscular investment, and as a pulsating heart, comparable to a force and suction-pump. FIG. 52.—Male of Branchipus stagnalis with many- heart or dorsal vessel Jiff, the lateral openings in \vhich are repeated in every seg- ment. D, intestine; 3f, mandible; Sd, shell gland; Hr, branchial appendage of the llth pair of legs ; T, testis. — A
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