Mollusca of Great Britain. 347 



Pine-pits at Miller's nursery near Bristol, can hardly be 

 said to be thoroughly naturalized. 



Genus V. CIONELLA. 



Animal glutinosum. Tentacula injh'iora brevissima. 



Testa oblonga seu elongata ; anfracta ultimo niajore. Ayex 

 acutiusculus. Columella subinterrupta. Apertura ca- 

 naliculata, ad basin subefFusa, marginibus ina^qualis- 

 simis. Umbilicus nullus. 



Baron Ferussac remarks, that the animals of his Styloides, 

 a group of his subgenus Cochlicopa, and which answers to 

 this division, do not agree in their conformation with those 

 of the true Polyphemi of Montfort. This remark will, I 

 believe, be found to apply equally well to the genus Aclia- 

 tina as established by Lamarck, besides the character which 

 seems essential to that genus, of the truncature of the colu- 

 mella being parallel, or nearly so, with the base of the 

 shell. In the genus I have proposed, the columella is 

 slightly interrupted, and forms a channel or sinus in the 

 aperture ; though 1 have not observed that it is attended 

 on the part of the animal by any corresponding pecu- 

 liarity. 



1. LUBTJICA. 



yi/M';na/nitidum, fuscescenti-nigrum ; subtiis pallidius. Ten- 

 tacula inferiora vix percipienda. 

 Testa oblonga, subcylindrica, diaphana, polita, nitidissima, 

 fulvo-flavescens. Anfractus 4 — 6, rotundati. Apertura 

 ovato-oblonga, in junioribus ad basin arcuata : peri- 

 stomio saepfe incrassato, luteo, in columellam reflexius- 

 culo. 



Long. 0.25.— Diam. 0.085. 



Helix 



