POLYGYRA ALBOLABRIS AND LIMAX MAXIMUS 271 



From the lateral ganglia of each mass proceed two very con- 

 spicuous nerves; the inner one (pi. 12, I), continuing to the mouth, 

 the outer one continues anteriorly, branching; one branch (fc) 

 going to the mouth and adjacent parts, the other (i), continuing 

 to the ganglion at the extremity of the inferior tentacles. 



The nerves previously described give off ibranches to the anterior 

 part of the body, also to the penis and vagina. 



From the lower inferior part of the principal ganglion proceeds 

 a commissural cord (o), connecting with the buccal ganglion. 



The anterior extremities of the buccal ganglia are connected by 

 a commissural cord. 



From the buccal ganglia nerves pass off: first, two nerves, ante- 

 riorly, to the surface structure of the buccal body; second, two 

 branches, which penetrate posteriorly into the buccal body; third, 

 a branch accompanying the salivary duct to the salivary gland; 

 fourth, a branch to the esophagus; fifth, a nerve to the anterior 

 part of the buccal body. 



From the infra-esophageal ganglionic mass proceed the follow- 

 ing described nerves : from the dorsal ganglion a very conspicuous 

 nerve (p), which takes the same general direction as the cephalic 

 artery, continuing alongside the uterine canal. At the point where 

 the arteries give off branches to the muscles and the crop the nerve 

 passes through the loop thus formed, and also gives off branches 

 both to the muscle and to the crop. It then continues, slightly 

 diminished in size, along the uterine canal to the albumen gland. 

 The main part continues along the albumen gland; a branch ac- 

 companies the hermaphroditic duct to the ovotestis, giving off 

 filaments to the stomach and digestive gland. Another branch pro- 

 ceeds to the heart and renal organ. From this branch a smaller 

 branch proceeds to the adjacent parts of the digestive gland. The 

 nerve is easily traced to the digestive gland, but from that point 

 the nerves are very fine, and careful study is necessary to distin- 

 guish them. 



From each of the two ganglia adjacent to the dorsal one, a very 

 large nerve passes to the muscular collar (r); bifurcating just be- 



