SS6 NOTICE OF MARINE DEPOSITES 
bed of clay, of different shades of brown, passing into yel- 
low colours, as we descend. In the upper, or brown clayy 
are found shells of the following species. Those marked ? 
are doubtful. 
Buccinum reticulatum ? 
Nerita glaiicina. 
Tellina tenuis ? 
Cardium edule. 
Venus striatula. 
Venus Islandica. 
Nucula rostrata, young, 
Pecten obsoletus. 
Anoraia ephippiura, young. 
Balanus communis. 
Balanus rugosus. 
Echinus esculentus. 
A skilful conchologist would discover many others, from 
the numerous traces of them in the clay. Those shells ap- 
pear to have been deposited generally in an entire state, 
and many are found with both valves in their natural posi- 
tion. The Balanus is still shghtly attached to the Venus 
or Pecten; and the spines of the Echinus are found clustered 
in the clay inclosing its fragments ; so that they must have 
been either covered by water to a considerable depth, or 
thrown on a beach not much exposed to waves. Few of 
them, however, can be extracted entire, as several of the 
species are always in a state of gritty chalk ; but many 
complete and beautiful specimens of the pecten can easily 
be procured. Few of their fragments appear on the exposed 
part-of the beach, but, during summer, many may be seen 
a few feet under water. Those deposites cannot be more 
than about twenty-two feet above the present level of the 
sea. It is probable that an attentive inspection of the mar- 
gin of the lake would discover many others similar to them* 
