NKWTON : ON MIOCKXK GASTROPODS FROM ROUMAXIA. 343- 



size and the possession of closer concentric sculpture, from the latter 

 in having a more rounded contour and in showing closer and more 

 numerous concentric ridges and grooves. 



The specimen described is much flattened, forming a kind of im- 

 pression on the stiff greyish clay to which it is attached. It is, 

 moreover, incomplete on the left side, the original margin having been, 

 worn away, but the concentiic sculpture and definite border-line of 

 the remaining part of the shell offer sufficient evidence for a complete 

 restoration, if required, of its entire external contour. The condition 

 of preservation is much the same as controls nKJst examples of this 

 genus, with the exception, perhaps, of Rousseau's ' original type of 

 v. annulata, which ha^s a beautifully oval, arched, convex test, widely 

 sculptured, sulcated surface, and non-spiral summit, displaying on the 

 right side of the apex the characteristic swollen plication extending 



' L. Rousseau, "Description des principaux Fossiles de la Crimee ": A. de Demidoff's 

 " Voyage dans la Russia Meridionale et la Crimee," 1842, vol. ii, p. 701, atlas, 

 pi. m, fig. 7. 



