166 



PHYSIOLOGY 



10. 



15. 



sr 



Fio. 95.— Dorsal view of the internal organs of the earthworm, a.o., aortic arch ; 

 c, crop ; e.g., cerebral ganglion ; d, dissepiment ; d.v., dorsal vessel ; g, gizzard ; 

 ce, oesophagus ; ph, pharynx ; s. i., intestine ; s.r., seminal receptacles ; t, semi- 

 nal vesicles. (From Sedgwick and Wilson.) 



series of circular vessels. Near the anterior end, five of 

 the circular vessels called the aortic arches, become en- 



