202 MOLLUSCA OCCURRING IN BISHOPS STORTFORD. 



highest ground in the district between Greenwich and Dartford, 

 which certainly lies in a slight synclinal basin, the Blackheath Pebble 

 Beds at Woolwich dipping slightly under Shooters' Hill and coming 

 up again southward of it at Eltham. It seems, therefore, probable 

 that the Bagshot outliers of Warley, Stock and Billericay, with the 

 heights of Danbury and Tiptree Heath, may owe their preservation 

 in a considerable degree to their position on a long line of synclinal 

 fold. 



MOLLUSCA OCCURRING IN THE NEIGHBOUR- 

 HOOD OF BISHOP'S STORTFORD. 



ADDITIONS AND CORRECTIONS. 



By EDWIN G. INGOLD. 



O INCE my paper on the above was published in the Essex Natu- 

 ^^ RALisT (vol. iv., pp. 215-217), I have been able to add two 

 species to the list of local Mollusca ; and I find it necessary to make 

 corrections in the determination of some species in my collection, 

 at the instance of the referee to the Conchological Society. 



The additions to the previous list are : — 

 Ancylus lacustris, L. River Stort; uncommon. 

 Helix hortensis, Miill. Hedgerows ; common. 



The corrections necessary to be made are : — 



For Paludina contecta read P. vivipera, L. 



Delete Zonites aliiarius^nd Z. excavatns (the supposed specimens 

 of the former were a variety of Z. cel/ariiis, and the latter a variety of 

 Helix hispid a). 



For Helix conciutia read Helix hispida, L. 



For Pupa timbilicata read Pupa margin ata, Drap. 



All the remaining species in my list are, I believe, correctly 

 named, and I regret that any mistakes should have occurred. 



NOTES— ORIGINAL AND SELECTED. 



Late nesting of Rooks at Felstead. — Mr. J. French, writing on October 

 28lh, said : — '' Some Rooks of about five or six weeks old have been observed 

 since October 2Cth in this village (Felstead). Nothing is known of their nest, or 

 whether they are first or second broods. It is believed to be an uncommon 



