514 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIN'TY. 
allows these two arteries to leave the central cavity of the 
brain, through which they pass posteriorly, and gain the 
ventral surface of the buccal mass, over which they run 
obliquely (fig. 42, C.A.). At the anterior end. of this 
mass, each cephalic artery divides again. A _ second 
division of these four branches now gives the eight 
brachial arteries (fig. 42, Arm. A.) which supply the 
arms. 
Kach brachial artery runs down the centre of the arm, 
external and closely appled to the brachial nerve 
(Pl. VIII, fig. 80). Externally it gives off a series of 
small arteries all along the arm, to the muscles and skin 
of the external surface of the arm, and to the web 
(Pl. VIII, fig. 79). Internally the brachial artery 
furnishes two branches to each sucker (fig. 79, S. a.). 
These run up one on each side of the corresponding nerve 
ganglion, and penetrating the muscles of the arm, end in. 
superficial small branches on the sucker and internal 
surface of the arm. ‘The brachial artery extends to the 
tip of the arm, its size decreasing with the corresponding 
lessening of that organ towards the tip. 
Although the anterior and posterior salivary glands 
are widely separated from one another, yet their arteries 
have a common origin. Soon after its bifurcation, the 
anterior aorta gives off two branches, one from each fork 
(fig. 42). Hach branch immediately divides again, one 
artery running posteriorly to the corresponding posterior 
salivary gland, which it enters anteriorly (fig. 42, S, A,), 
and one branch (the pharyngeal artery, fig. 42, PA. A.) 
running anteriorly to the buccal mass. | | 
The pharyngeal arteries run forwards, one on each 
side of the oesophagus, through the cranial cavity, and 
emerging with the oesophagus reach the buccal mass. 
Here each artery runs below the _ sub-oesophageal 
