264 Similar "Remains in Greensand and Gault. 



Stutton (VII. 274.), though the species in the former are at 

 present not so numerous.* It is remarkable that the Cyrena 

 trigonula Wood occurs in great abundance at both places. 

 The specific characters of the Stutton shells appear to have 

 been identified with the recent types. Many of them at Grays 

 are also identical, though some few species are certainly 

 different f; as Unio, A'ncylus, Helix, a species of Valvata 

 which differs from the common V. piscinalis in the general 

 roundness of the whorls, and greater elevation of the spire. 



The mineral character of the Copford deposit appears to 

 be similar to that at Grays ; but the shells are much less per- 

 fect, as the Valvata and the opercula of Paludinae have only 

 escaped destruction, the other genera being mostly found as 

 fragments. The existence of the chalk nodules in the blue 

 clay at Copford is an interesting fact, as I have only found 

 them at Grays in the beds above that stratum. 



At Southend and Ilford, Essex, various animal remains 

 have been found associated with shells ; and, in offering the 

 preceding account to your readers, I hope that further re- 

 searches in this county may be attended with fresh dis- 

 coveries. 



Many of the above observations were made in company 

 with Dr. Mitchell, F.G.S., to whose kind attention I was first 

 indebted for the knowledge of this interesting locality. 



Kensington, March 16. 1836. 



Art. IX. A Notice of the Occurrence of certain Bodies in the 

 Greensand at Cambridge, that are similar to those found in the 

 Gault at Folkstone, as described in p. 4-7- ; and some Information 

 on the Greensand and contiguous Strata at Cambridge. By 

 Delta. 



Seeing, in p. 47., an account of some fossil bodies occur- 

 ring in the gault at Folkstone, I immediately perceived an 

 analogy between them and certain substances found in the 

 greensand at Cambridge. 



This bed lies between the chalk marl and gault, and sel- 

 dom exceeds 2 ft. in thickness ; while the stratum above it 

 varies from 14 ft. to 20 ft.; and that below usually extends to 

 100 ft. or^l50ft. beneath the surface. Although, however, 



* I have refrained, at present, from offering a specific list of the shells 

 and bones found in this deposit, as I hope in a future communication to 

 give a more perfect list of both. 



-j- From the information of Mr. G. B. Sowerby. 



