HELIX ALBOLABBIS. 



267 



Fie. 203. 



Fig. 204. 



Fig. 201. — Helix alholabi^, natural size, a, orifice of lung. Al?o the heart and 

 lung of Zimax /ariM, magnified. 



Fig. 202. — JTtlix albolaitris, with the phell removed to show the heart (/. ) and the 

 lung ; m, mouth.— This and Figs. 201-204 after Morse. 



Fig. 203. — Nerve-centres of Helix alholaLris. 



Fig. 204.— Jaw (lower figure) and side and top view of teeth of lingual ribbon of 

 Helix albolabris. 



