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 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 FIG. 53.—Heart of a Copepod (Calanelhi) with an ante- rior artery, A. Os, cstia ; V, valves at the arterial ostium; M, muscle. maintains a continuous circ
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 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 FIG. 53.—Heart of a Copepod (Calanelhi) with an ante- rior artery, A. Os, cstia ; V, valves at the arterial ostium; M, muscle. maintains a continuous circulation of the blood. The heart is either sac-shaped, with two lateral or one anterior slit-like opening (Daphnia, Calanus) (fig. 51), or elongated and divided into successive chambers and perforated by many pairs of slit-like openings (Insects, Apus) (fig. 52). As a rule, each chamber possesses a pair of laterally placed
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