Xvi MOLLUSCA OF SOMERSET. 
Burtle Beds were contemporaneous with the raised beaches, or 
were due to later incursions of the sea over the lowlands, is 
not certain” (H. B. Woodward). . 
Mr. Henry Corder obtained the following shells from a very 
fossiliferous patch of Burtle Bed at Perry Green, Wembdon, 
by a wet roadside ditch : 
Mytilus edulis, Linné. 
Ostrea edulis, Linné. 
Macoma balthica, Linné (= Tellina balthica, Linné). 
Cardium edule, Linné. 
Gibbula cineraria, Linné (= Trochus cinerarius, Linné). 
Littorina littorea, Linné. 
Littorina neritoides, Linné. 
Paludestrina stagnalis, Baster (= Hydrobia ulve, Pennant). 
Natica catena, da Costa. 
Buccinum undatum, ZLinné. 
Ocinebra erinacea, Linné (= Murex erinaceus, Linné). 
Nassa reticulata, Linné. 
Tornatina obtusa, Montagu (= Utriculus obtusus, Montagu). 
Mr. H. St. George Gray has recorded the occurrence of 
the following species from the excavation of Wick Barrow, 
Stogursey :1 
Vitrea alliaria, Miller. 
Helix aspersa, Muller (abundant). 
Helix nemoralis, Linné (common). 
Ceecilioides acicula, Muller (= Achatina acicula, Miiller). 
Pomatias elegans, Miiller (= Cyclostoma elegans, Miiller). 
Patella vulgata, Linné. 
A Holocene deposit on Brean Down (south side) yielded 
four species when I examined it in June, 1910: 
Vitrea cellaria, Muiiller. 
Helicella virgata, da Costa, 
Helicella caperata, Montagu. 
Helicella barbara, Linné (= Helix acuta, Miiller). 
1. Proc. Som. Arch. Soc., LIV, ii, 52. 
