80 GRIFFIN. 



The pointed anterior end of the ventricle joins a bulbous aorta 

 of considerable size, a large appendage of which projects upon 

 the right side. Four large arteries spring from the aortic bulb, 

 the intestinal, gastric, and genital arteries, and the aorta. 



The gastric artery (fig. 30, Plate V, 22) quickly divides into 

 two branches which follow the junction of crop and gizzard, one 

 on the dorsal and left sides, the other on the right and ventral 

 surfaces. Each gives off branches to both gizzard and crop. 

 The right branch sends a large vessel to the oesophagus. The 

 aorta (fig. SO, Plate V, 5) passes forward and downward over 

 the left side of the viscera until it reaches a position beneath 

 the posterior extremity of the pharynx. Here, a large vessel 

 is sent forward beneath the pharynx until the anterior portion 

 of this is reached, where the vessel enters the pharynx. This 

 vessel sends a small branch from its right side to the pleu- 

 ropedal ganglion; from the left side a larger branch supplies 

 the ventral and dorsal walls of the head and the cerebral 

 ganglia; a ventral branch passes into the foot. 



In one specimen dissected, a large branch arose from each 

 side of the base of the pharyngeal artery (fig. 30, Plate V), 

 at the point where it passes beneath the pedal ganglia. The 

 right branch entered the sheath of the right side of the nerve 

 ring, the left one the left side. The diameter of each branch 

 being fully half that of the pharyngeal artery, it may be seen 

 that the central nervous system is richly supplied with blood. 



The aorta then turns backward along the left side of the foot, 

 sending first a large branch into the middle portion of the foot, 

 then passing into the tissues at the junction of foot and lateral 

 body wall back of the middle of the body. 



The intestinal artery (fig. 30, Plate V, 19) arises from the pos- 

 terior part of the aortic bulb, passes immediately into the liver, 

 and then follows closely the second, posteriorly-directed loop of 

 the intestine. One large branch passes through the anterior part 

 of the liver to the part of the intestine just back of the gizzard 

 (fig. 30, Plate V, 23) ; other branches pass into the substance of 

 the liver ; numerous short branches are given off to the intestinal 

 walls. The genital artery (fig. 30, Plate V, 12) gives off, first, 

 a branch which furnishes a rich supply of blood to the terminal 

 part of the sperm-oviduct and to the neighboring body wall, and 

 a branch to the osphradium. The main vessel passes downward, 

 following closely the medial side of the genital duct; it then 

 divides, one part passing above the duct to the right side of 

 the albumen gland, the other branch passing to the ventral side 



