POLYGYEA ALBOLABRIS AND LIMAX MAXIMUS 305 



Fig. 



2-3 Large lateral veins situated in the integument on each side 

 of the body. Only the larger veins are shown, but they 

 are connected with the arteries by a fine network of 

 veins and capillaries, x 3. 



4 Showing the arteries and veins of the large lobe of the 



digestive gland, x 3. 



5 1 pedal sinus; 2 lateral veins. 



PLATE 19 

 Muscular system, x 4 



Fia. 



1 1 origin of retractor muscles; 2 principal muscular bands; 



3 retractor muscles of the ocular tentacles; 4 retractor 

 muscles of the olfactory tentacles ; 5 retractor muscles of 

 the buccal body; 6 muscles proceeding from the olfac- 

 tory tentacular muscles to the mouth; 7 muscles pro- 

 ceeding from the anterobasal part of the animal to the 

 mouth ; 8 muscles proceeding from the anterolateral part 

 to the olfactory tentacular muscles; 9 muscles proceed- 

 ing from the anterolateral parts of the animal to the 

 mouth; 10 muscles proceeding from the anterotoasal part 

 to the olfactory tentacular muscles; 11 muscular fibers 

 from the buccal body to the mouth. 



2 Pulmonary veins, x 4. 



3 Under side of the pulmonary cavity, x 4: i auricle; 2 ven- 



tricle; 3 pulmonary veins; 4 respiratory orifice; 5 kidney; 

 6 duct or secondary ureter of kidney; 7 anus. 



PLATE 20 



Muscular system, x 6 

 Pig. 



1 1 buccal body; 2 muscular sheath of ganglia; 3 muscles of 

 the ocular tentacles; 4 muscles of olfactory tentacles; 5 

 muscles arising in the basal part of the animal and 

 connecting with the olfactory tentacular muscles; 6 

 muscles arising in the olfactory tentacular muscles and 

 connecting with the mouth; 7 muscle arising in the 

 basal part of the animal, beneath the ocular tentacular 



