176 



ANOSTOMA. 



HELIX RINGENS Linn. 



Sowerhy's Genera, No. 8, plate 1. 



Lamarck describes two species of this extraordinary 

 shell, hitherto considered of the G. Helix by former au- 

 thors, from which the peculiar structure eminently dis- 

 tinguishes it, and necessarily constitutes a well defined 

 genus by itself. Shell orbicular, globose, slightly 

 keeled; an obtuse convex spire, the last whorl turned 

 upwards, nearly reaching the summit, and rising at 

 the front part in a perpendicular direction from the 

 base of the shell ; the rounded aperture horizontally 

 attached to the body whorl on the upper side, with 

 two teeth on the columella, and three or sometimes 

 more on the right side, and the outer lip reflected on 

 the side not affixed to the spire : its general appearance 

 may be said to resemble the form of an antique Roman 

 lamp with a projecting spout. 



The only difference in the two species described by 

 Lamarck, is the one being more globular in form than 

 the other; there are also two small punctures, one on 

 each side of the lip near to the spire, in the second spe- 



