IS 



branches to the intestine on its way (PL VI, fig. 49, 

 /. S. A., Int. A.). The abdominal aorta now curves 

 ventrally, and can be seen on the ventral surface of the 

 visceral mass, between the two diverging anterior ends of 

 the kidneys (PL V, fig. -'37, Abd. A.). After giving off a 

 fairly large branch to the septal muscle (fig. 42, Sept. A.), 

 the abdominal aorta runs up alongside the intestine, to 

 end in fine branches on the rectum. In its course it gives 

 off several small intestinal branches, and also a second 

 septal branch (fig. 42, Sept 1 AA. To the left of this is 

 an important branch which terminates on the rectum, 

 after giving off several ramifying branches to the surface 

 of the liver, and a branch to the duct of the ink gland. 



The right branchial artery, soon after its origin, 

 gives off a coronary artery to the walls of the 

 ventricle. The left branchial artery, running 

 behind the left kidney sac, soon bifurcates (PL VI, 

 fig. 51, L. Bl. A.). One of the two forks running 

 along to the oviduct, gives off one or two small branches 

 to the auricle, and at the level of the oviducal gland 

 sends off a recurrent branch which runs down between 

 the water canal and the oviduct, to end in fine branches 

 on the wall of the genital capsule (fig. 51, F x , Rec). 

 Other branches given off by this fork run to the flask- 

 like portion of the coelom, to the anterior part of the 

 oviduct (fig. 51, otl.), and to the oviducal gland. The 

 other fork (fig. 51, F. 2 ), after giving off a branch to the 

 genital capsule, runs over and feeds the branchial heart, 

 sends a second branch to the gonad, and ends in a vessel 

 running to the gill tip — alongside the branchial nerve 

 — and supplying each leaflet with nutrient vessels (fig. 51, 



Bl. A.). 



The Genital aorta is an independent artery, given 

 off bv the postero-dorsal wall of the left chamber of the 



