268 POPULAR CONCHOLOGY. 



whorls contiguous, and all apparent; inner 

 surface (the exterior covering has generally 

 disappeared) marked by the si- 

 nuous partitions, which are trans- 

 verse, and lobed or cut, but not 

 perforated ; last chamber occupy- 

 ing the whole of the last whorl 

 of the spire. — Between 200 and 

 300 species. 



These shells are all fossil, and are occasion- 

 ally two feet or more in diameter.* They 

 occur in Europe, Asia, and America. Dr. Ge- 

 rard found them in the Himalaya mountains, 

 an elevation of 16,000 feet; M. Menard met 

 with one in the Maritime Alps. Their numbers 

 must have been very great, as M. Dufresne in- 

 formed Lamarck that the road from Auxerre 

 to Avalon, in Burgundy, was absolutely paved 

 with them ; and it is no uncommon occurrence 

 to find them used in some parts of Somerset- 

 shire, Gloucestershire, and Yorkshire, to pave 

 the roads. 



132. Turrilites. — Shell spiral, turreted; 



* Dr. Buckland jpeaks of some found in the chalk 

 near Margate which exceeded four feet in diameter. 



