304 
Clement Heid — Pliocene Beds near Cromer. 
Pupa, sp. 
Caryehium minimuni, 
Clausilia , sp. 
Corbicula fluminalis. 
Sphcerium cornewn. 
Pisidium amnicum. 
fontinale , var. Henslowana. 
pusillum. 
Unio pictorum. 
Anodon cygneus. 
To the above list may be added Pliysa fontinalis and Planorbis 
nitidus from specimens in tlie Norwicli Museum. I have beeil 
unable to find Unio margaritiferus and Pisidium nitidum mentioned 
in Prof. Prestwich’s paper (op. eil.). 
None of tbe Shells are stunted, and the whole assemblage, witli 
tlie exception of Corbicula fluminalis, is such as miglit now be fouud 
in the Norfolk broads. There appears to be no sufficient reason 
for classing either this or the Weybourn Beds with the glacial 
series, for the climate, as shown by the land animals and plants, 
was but little, if at all, cokler than at present. The first appear- 
ance of Tellina Balthica, so much relied upon by Messrs. Wood 
and Harmer, seems liardly of sufficient importance, in the absence 
of otlier evidence, to mark the incoming of the Glacial Period, for 
it is now living on our coasts, and is by no means a peculiarly arctic 
shell. 
Myalis Bed. 
We now arrive at beds which show a decided change of con- 
ditions, for directly over the fresh-water deposits and usually 
separated from thern by a marked line, occur fine false-bedded 
sands with gravel and loam. the fossils of which would have lived 
in a depth of five or ten fatlioms. These sands, for which I propose 
the name of Myalis J.ed, from their being characterized by the 
presence of Leda myalis, are very sparingly fossiliferous ; but where 
fossils do occur, they form colonies, with the bivalves in their natural 
Position. I have been unable to adopt Prof. Prestwich’s name of 
“ Westleton Beds,” as the shingle at bis typical locality is uufossil- 
iferous, isolated, and is not seen in connexion with either the Fresh- 
water Bed or the Contorted Drift. His fossils were obtained from 
the Weybourn and Fresh-water beds, with the exception of Lcda 
myalis and Mya truncata, obtained from West Runton . 1 
This bed bas already yielded the following species, and I hope 
in time to add more : — 
Buccinum undatum, r. 
Lacuna, sp., v.c. 
Littorina littorea, c. 
„ rudis, v.r. 
Natica, sp., v.r. 
Purpura lapillus, r. 
Trophon antiquus (reversed var.), r. 
* Aslarte borealis, r. 
* In their natural position with the valves United. 
A careful examination of the junction of the Myalis Bed with the 
* Cyprina Islandica, v.c. 
* Lcda myalis, v.c. 
* Mya truncata, v.c. 
Mytilus edulis, r. 
* Ostrea edulis, v.c. 
Tellina Balthica, c. 
1 When on a visit to Westleton last year, my colleagues, Messrs. II. B. Woodward 
and J. II. Blake, ascertained that the shingle at that locality was the equivalent 
of rnasses of shingle that occur in the so-called Middle Glacial Sands of Dunwich 
Cliff. 
