1 62 NOTTINGHAMSHIRE SUBFOSSIL MOLLUSCA. 



it extends further. It is now mapped by the Ordnance Survey 

 as alluvium^ and on the part now occupied by the fields where 

 the above species came from, and called the moor, it was once 

 boggy undrained land. It lies some fifty feet above the level 

 of the Trent Valley, equal to about 130 feet above that of the 

 sea. 



At Gotham, on Gotham Moor, is a very similar deposit of 

 black earth — not to be distinguished in any way from the Bing- 

 ham deposit, and formed under similar conditions — resting in 

 a hollow of the hills fully 170 or 180 feet above sea level, with 

 an outlet in one direction only (the Fairholm Brook). Here I 

 obtained the following species : — 



* Planorbis spirorbis * Helix concinna 



* Limnaea truncatula * H. hispida 



* Succinea putris H. pulchella 



* S. elegans * Cochlicopa lubrica 

 Zonites cellarius 



* Helix nemoralis (var. 



libellula 12345) 



The shells from the Fairholm Brook included : — 



* Pisidium fontinale var. * Zonites cellarius 



cinerea * Z. nitidulus 



* Bythinia tentaculata * Helix concinna 



* Limnsea peregra * H. hispida 



* L. palustris * H. caperata 



* Succinea elegans * Clausilia rugosa 



At Scarthingmoor near Tuxford Mr. W. Gain pointed out 

 to me a very similar deposit of alluvium which appears to cover 

 a considerable space of ground. In a field where an excava- 

 tion had been made we found a section as follows : — 

 One foot of black soil full of shells, including 



* Bythinia tentaculata Zonites fulvus 



* Valvata piscinalis * Helix hispida 



* Planorbis vortex * H. pulchella 



J.C, iv;, April, 1SS4. 



