POLYGYRA ALBOLABRIS AND LIMAX MAXIMUS 297 



PLATE 4 



Fig. 



1 The buccal body, enlarged, from above ; 1 the buccal body ; 



2 esophagus; S salivary ducts; Jf nerves uniting cerebral 

 and buccal ganglia; 5 retractor muscles; 6 depressor mus- 

 cles; 7 levator muscles; 8 protractor muscles; 9 labial 

 muscles. 



2 The buccal body. The dorsal wall is cut through, and 



separated, displaying a part of the interior; 1 buccal 

 body; 2 muscular wall of the buccal body; S lateral lips; 

 Jf. radula^ or lingual ribbon; 5 sac of radula; 6 esophagus; 

 7 salivary duct. 



3 The buccal body laid open, from above; 1 lateral lips; 2 



muscular wall of the buccal body; S odontophoral carti- 

 lage; 4 radula; 5 sac of radula; 6 retractor muscles. 



4 Longitudinal section of the buccal body; 1 odontophoral 



cartilage; 2 radula; S sac of radula; 4 muscular wall; 5 

 jaw or dental plate; 6 esophagus; 7, 8 muscles connected 

 with the radula; 9 opening of the pedal sinus; 10 pedal 

 sinus; ii muscular sole of animal; 12 infra-esophageal 

 ganglia; 13 supra-esophageal ganglia; i^ retractor mus- 

 cles; 15 tentacular muscle. 



5 A section of the animal showing: 1 pedal sinus; 2 large 



veins; S small veins; ^ mucus glands; 5 muscular sole 

 of foot. 



6 Perpendicular section of the buccal body; 1 esophagus; 2 



salivary ducts; 3 lingual ribbon or radula; '/ sac of 

 radula; 5 odontophoral cartilage. 



7 Vertical section, the same as figure G, the esophagus, ete., 



have been removed, bringing into view the radula; 1 

 radula; 2 odontophoral cartilage. 



