Xiv MOLLUSCA OF SOMERSET. 
Pomatias elegans, Miiller (=Cyclostoma elegans, Miller). 
Neritina fluviatilis, Linné. 
MARINE. 
Scrobicularia plana, Da Costa (=S. piperata, Bellonius). 
Macoma balthica, Linné (= Tellina balthica, Linné). 
Littorina obtusata, Linné. 
Littorina rudis, Maton. 
Leuconia bidentata, Montagu. 
The peat beds yield but scanty molluscan remains. I have 
examined many sections in the neighbourhood of Shapwick, 
but succeeded in finding nothing more than fragments of 
various species of Planorbis and Pisidium, in such a condition 
as to render specific identification impossible. Many years 
ago Mr. Arthur Bulleid, F.s.a., shewed me some shells from 
the peat at the Glastonbury Lake-village, they comprised 
three common inhabitants of the rhines at the present time, 
wales 
Valvata piscinalis, Miiller. 
Bithynia tentaculata, Linné. 
Pisidium amnicum, WMiiller. 
Raised beaches occur at Anchor Head and Woodspring 
Hill north of Weston-super-Mare. They are between 20 to 
30ft. above high-water mark, and are covered by blown sand, 
rubble, and talus. They consist of sand and shingle (Carbon- 
iferous Limestone pebbles with occasional flints) well stratified 
and often compacted. Mr. E. C. H. Day, F.G.s., published, 
in the Geological Magazine of 1866, a paper on these raised 
beaches. He observes that the shingle was cemented into 
masses of conglomerate so hard “that it required violent 
labour with heavy tools to break them.” Embedded in the 
masses were bones of horses and hyznas (cave), with numerous 
shells of Littorina littorea, Linné and Tellina tenuis, da Costa. 
Mr. H. B. Woodward is of opinion that these remnants of 
