HELIX ALBOLABRIS. 247 
Fie. 198. Fig. 199. 
Fig. 196.—Helia albolabris, natural size. a, orifice of lung. Also the heart and 
ung of Limax flavus, magnified. 
Fig. 197.—Helin albolabris, with the shell removed to show the heart (7) and the 
ung; 7, mouth.—This and Figs. 201-204 after Leidy. 
Fig. 198,—Nerve-centres of Helix albolabris. 
Fiv. 199.—Jaw (lower figure) and side and top view of teeth of lingual ribbon of 
Melix albolabris. 
