POLYGYRA ALBOLABRIS AND LIMAX MAXIMUS 303 



Pig. 



3 The organs are separated, and each organ is shown more 

 distinctly. 1 buccal body; 2 salivary ducts; 3 salivary 

 glands; 4 crop; 5 intestines; 6 rectum; 7 stomach; 8 

 digestive gland; 9 penis; 10 retractor muscle of the 

 penis; 11 receptaculum seminis; 12 uterine canal; 12^ 

 spermatic duct; 12^' albumen gland; IS hermaphroditic 

 duct; IJf ovotestes; 15 nerves to the basal part of the 

 body; 16 large veins in the integument of the sides of 

 the animal; 11 ventricle; 11^ auricle; 18 kidney; 19 duct 

 of kidney; 20 pulmonary veins; 21 respiratory orifice; 

 22 insertion of retractor muscles; 2S tentacular muscles; 

 2Jf mantle; 25 integument; 26 arteries. 



PLATE 16 

 Fig. 



1 The under side of the head, showing the mouth; 1 anterior 



or upper lip; 2 lateral lips; S four corrugations of the in- 

 tegument surrounding the mouth; 5 triangular ap- 

 pendages. 



2 View from above, the integument and dorsal part of the 



basal body cut open and turned back: 1 corrugations of 

 the integument surrounding the mouth; 2 lateral lips; 

 S buccal body; If jaw; 5 radula; 6 esophagus; 7 salivary 

 ducts; 8 muscles of ocular tentacle; 9 muscles proceed- 

 ing from the anterobasal part of the animal, and In- 

 serted in the olfactory tentacular muscle; 10 muscle pro- 

 ceeding from the anterobasal part of the animal to the 

 mouth; 11 muscles of the olfactory tentacles; 12 muscles 

 from integument to anterior part of buccal body; IS 

 penis. 



3 Digestive organs^ etc.: 1 buccal body; 2 esophagus; S 



salivary ducts; Jf salivary glands; 5 crop; 6 stomach; 7 

 intestine; 8 rectum; 9 anus; 10 arteries, x 3. 



4 Enlargement of the under side of the upper salivary gland. 



5 Dorsal view of an adult ind vidual. 



