142 HELICID^E. 



less prominent and thick than in that species. The teeth 

 on the outer lip are sometimes entirely "wanting, at other 

 times very distinct; sometimes the upper, but usually 

 the lower one is alone present. The lower lip-tooth is a 

 lamellar enlargement of the lip, extending from the base 

 nearly to the superior extremity of the lip. The smaller 

 sized specimens resemble considerably Helix inflecta, 

 Say ; and it seems almost to form a connecting link 

 between that species and If. -palliata. The larger speci- 

 mens are hardly inferior in size to individuals of the last- 

 named species, which they closely resemble. Large 

 specimens, without teeth on the outer lip, also resemble 

 the species which I have called Helix dentifera ; but 

 that species never has the lip-teeth, and is not so much 

 depressed. A favorite place of resort of this species is 

 under flat stones about neglected quarries. 



The first publication of a description of this shell was 

 by Mr. Say, in the place referred to, in 1821 ; the next 

 year a second appeared, by Lamarck, in the first edition 

 of his Animaux sans Vertebres, under the name of 

 Helix linguifera, reference being made to Ferussac's 

 Histoire des Mollusques, which was not then published. 

 Mr. Say's name ought, therefore, to be preferred. 



