142 HELICID^. 



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, extendmg 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 H. 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 Vertcbres, under the name of 

 Helix linguifera, reference being made to Fi^russac's 

 Histoire des Mollusques, which was not then published. 

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



