Lamplngh : Estiiarine Shells at Sand-le-Mere. 9 



Section on the shore near the northern edge 



OF Sand-le-Mere. 

 Muddy silt with peaty roots and stems of ^^- Ins- 



coarse grass and rushes ; Hydrohia 

 abundant . . . . . . . . about o 4 



Fine black silt, with laminae of grey silt, 

 containing Hydrohia in great abun- 

 dance, and with a 2-inch seam of 

 black sand containing Tellina halthica 

 and clusters of Mytilus edulis . . , , o 6 



Banded bluish, greenish and dark grey 

 ) tenacious silty clay, with cakes and 



rolled lumps of peat, and a few black 

 sticks — some resembling branched 

 roots : Cardium edule (small) Mytilus 

 edulis (in patches), and Hydrohia 

 (abundant) . . . . . . ..,,03 



Browner mud or clay, often black in lower 

 part, with Cardium edule, Mytilus 

 edulis and Scrohicularia . . . . ,,0 6 



The underlying beds were hidden by sand, 

 except at the extreme margin of basin 

 where the w^hole estuarine series was 

 reduced to a few inches of sandy mud, 

 with Hydrohia, resting on — 

 Silty mud, full of stones derived from the 

 underlying boulder-clay, and bits of 

 peat and black sticks .. .. ..about o 10 



Sloping floor of stony red boulder-clay, 

 weathered to an earthy texture at the 

 top . . . . . . . . . . — 



Farther southward in the same exposure, in the middle 

 and towards the southern side of the basin, the material seen 

 consisted almost entirely of black peat, containing much wood 

 and some matted roots and stumps of small trees. Associated 

 with the peat there was in one place a large patch of grey 

 tenacious mud, containing fresh-n'ater shells only, among which 

 were a large Planorhis, Limncea and Cyclas.* It is noteworthy 

 that this purel}^ fresh-water mud occurred at precisely- the same 



* Owing to the execrable weather, I did not stay to make collections 

 of the shells, and am therefore unable to give specific determinations. 



jgio Jan. i. 



