68 



ZoNiTKs ExcAVATus (The Excavated Snail). Bean. 

 Figures 41 and 42. 



^ 



It is with some hesitation that this snail is included 

 in our Nottinghamshire shells, from a single, though 

 undoubted, specimen, obtained near Sawley, on the 

 border of this county. 



It is fragile, depressed, polished, pellucid, horn- 

 coloured ; has five and a half to six close convolutions ; 

 blunt apex; small aperture, which is rounded ; an ex- 

 ceedingly wide and deep umbilicusj thin peristome. 



Diameter of the shell nearly a quarter of an inch. 



The animal is lead-coloured. 



It is very like Zonites nitidus, yet being more convex, 

 and having a much larger umbilicus. 



Zonites excavatus was discovered by Mr. Alder, of 

 Newcastle, and described, in the year 1830, in his 

 " List of Newcastle Shells." 

 Found under felled timber and decayed wood. 



Localities: — Yorkshire, Northumberland, and Dur- 

 ham (Forbes), Newcastle (Alder), Scarborough (Bean). 

 In the south of Scotland (Forbes). The Highlands 

 (Alder). Cork (Miss King), and Galway (Thompson). 



Professor Forbes remarks that it has not hitherto 

 been discovered in any country excepting Great 

 Britain. 



