POLYGYRA ALBOLABRIS AND LIMAX MAXIMDS 281 



Near the esophagus it bifurcates, a branch proceeding to each of 

 the salivary glands, and anterior part of the crop. In its progress 

 to the anterior part of the crop it gives off four branches, two on 

 each side of the crop. These branches in turn give rise to numer- 

 ous others. ' 



The second principal branch (3'), proceeds posteriorly for some 

 distance, giving off comparatively few branches. 



At the subdivision of the anterior and posterior crop arteries 

 there are two smaller branches (4, 3"), the first of which proceeds 

 to the uterine canal, the second directly to the ventral part of the 

 crop, giving off several branches principally posteriorly. 



At the ganglionic mass, where the aorta turns downward and 

 backward, a branch continues forward under the buccal body {13), 

 giving off small branches to the buccal body, muscles, lips, etc. 

 Branches from the anterior artery accompany the commissural 

 cords connecting the two principal ganglionic masses, forming a 

 complete circle, as in P. a 1 b o 1 a b r i s {14), giving off branches to 

 the tentacles {15). 



Just previous to its turning backward the anterior artery puts 

 out a branch, which subdivides and supplies the penis and vagina 

 {11, 12). 



The posterior aorta gives off branches to the stomach, intestine, 

 digestive gland, uterine canal, hermaphroditic duct, ovotestis, etc. 

 The first branch follows the course of the intestine, entering a lobe 

 of the digestive gland, and ramifying through it. Very near this 

 the artery gives off a branch, which proceeds along the hermaph- 

 roditic duct to the ovotestis. Two small branches have previously 

 been given off to the hermaphroditic duct. Several small branches 

 are now given off to the intestines at frequent intervals. 



From the opposite side of the artery a branch proceeds to the 

 upper attenuated end of the principal lobe of the digestive gland, 

 giving off numerous branches throughout the lobe. 



The next branch continues along the outer surface of the large 

 lobe of the digestive gland, giving off numerous branchlets, which 

 ramify throughout the lobe. 



Immediately after the anterior artery bends abruptly toward the 



