77 



ACTEON cuspidatus. 



TAB. CCCChV.~fig. 1. 



Spec. Char. Subcylindrical, smooth; spire 

 immersed, cuspidated ; one plait upon the 

 columella. 



J. HIS shell is nearly cylindrical, but it is a little con- 

 tracted towards the base ; the upper end is truncated 

 with a small portion of the acute spire in its centre ; the 

 aperture extends the whole length of the shell, except 

 this small part of the spire ; the colummella has a sharp 

 spiral edge, and one distinct plait above it. The aper- 

 ture spreads a little, but is not notched at the base. 



So novel is the contour of this little shell, that it is 

 with difficulty compared to any before known ; it 

 agrees, however, with the essential characters of Acteon, 

 but differs in general form, and in having a plain surface ; 

 it comes nearer in shape to Volvaria, but that has a trun- 

 cated or notched base, and crenated lip to the aperture, 

 besides several plaits upon the columella. It has been 

 proposed to form a new Genus of it, to be called Cylin- 

 drites, but the following species having a conical spire, 

 connects it with Acteon Nose, (tab. 374.) 



Figured from the Rev. George Cookson's Collection 

 of Fossils found at Ancliffe. Fig. 1, A. is magnified. 



