POLYGYRA ALBOLABRIS AND LIMAX MAXIMUS 307 



PLATE 22 



Nervous system 



1 supra-esophageal ganglia; 2 infra-esophageal ganglia; ^' 

 commissural cords connecting tlie supra- and infra-esophageal 

 ganglia ; S buccal ganglia ; 5' commissural cords connecting the 

 cephalic or supra-esophageal and the buccal ganglia ; S" commis- 

 sural cord uniting the buccal ganglia; If stomachic ganglia; 

 5 nerves to the ocular tentacles; 6 nerves to the olfactory ten- 

 tacles; 7 nerves to the mouth; 7' nerves to the lips and adjacent 

 integument ;^ 8 nerves to the integument of the integument of the 

 ocular tentacles; 9 nerves to the anterior part of the buccal body; 

 10, 11 nerves to the posterior part of the buccal body; 12 large 

 nerves running to the posterobasal part of the animal ; IS, 13^ 

 branches of the preceding; 14, 15 nerves from the pedal ganglia 

 to the basal part of the body; 16-19 nerves from the pedal ganglia 

 to the sides of the body; 20 cord connecting pedal and stomachic 

 ganglia ; 21 nerve to retractor muscles ; 22 nerve to pulmonary 

 cavity. 



PLATE 23 



Pig. 



1 A profile view of a small specimen of Limax maxi- 



m u s : i respiratory orifice; 2 genital orifice. 



2 The radula, profile view, x 6. 



3 The same, as seen from above, x 6. 



4 The jaw and its retractor muscle, x 6. 



5 Dorsal view of upper salivary gland, x 3: i salivary duct; 



2 arteries; 3 nerves; 4 artery to the stomach. 



6 Lower salivary gland: 1 salivary duct; 2, 3 arteries; 4 



nerve, x 3. 



7 The digestive gland detached from the intestine, etc. dorsal 



view, X 3. 



8 The same as seen from below; the points a are in apposition 



when the gland is in its natural position: 1 herma- 

 phroditic duct; 2 arteries. 



