240 



HITCHCOCK'S ANATOMY 



Fig. 242. 



Circulatory Apparatus in the Lobster. «, The Heart. Ophthalmic Artery, c, An- 

 tennar Artery, d, Hepatic Artery, e, Abdominal Artery, f, Sternal Artery, g, Venous 

 Sinuses. A, Branchiae. 



heart of the animal, since by the contraction of its coats the 

 blood or contained fluid is forced along. Small arteries are 

 given off from this dorsal vessel all along its course. This 



Fig. 243. 



Circulation in Insects, a, Dorsal Vessel, b, Principal Lateral Currents. The Arrows 

 show the direction of the Fluid. 



plan, however, is seldom completely carried out, but is most 

 fully exemplified in the class of insects which is partly ex- 

 hibited in Fig. 243. 



