DIESTIAN. 
63 
obtained from a boring—is very similar to that at Lenham, and 
the depth of water is no greater. 
To assist comparison of the different localities and their faunas, 
a table has been drawn up showing the whole of the known 
species of mollusca and brachiopods from Older Pliocene beds of 
the Diestian type. The object of this list is to ascertain whether 
the faunas from the different localities are such as might be 
expected to inhabit adjoining portions o£ the same sea under 
similar conditions. It was necessary in preparing the table for this 
purpose to eliminate all exceptional deposits, and in the analysis 
only to deal with those fossils which may reasonably be expected 
to occur at all the localities. Mere numerical comparisons or 
the species common to two deposits formed under different 
conditions are quite useless for settling whether the beds are or 
are not contemporaneous. In fact they are worse than useless, 
they are misleading. No one expects to find the same fauna 
inhabiting all portions of the English Cliannel at the present 
day. The Coralline Crag and the St. Erth clays have purposely 
been omitted from the table, because they are of different 
lithological types and consequently contain a number of species 
that probably would not live on a bottom of ordinary quartz 
sand. 
Diestian Fossils, 
(All but those marked * * occur also in the Coralline Crag.) 
Lenham. 
Diest, &c. 
Antwerp. 
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Actaeon subulata, S. Wood - 
-tornatilis, L. 
Adeorbis striatus, Fhil. 
-subcarinatus, Mont. - 
Aporrhais, see Chenopus. 
Buccinopsis Dalei, J. Sow. • 
Buccinum undatum, L. 
Bulla acuminata, Brug. 
• ■ ■ lignaria, Linn. 
Calyptrsea chinensis, L. 
Cancellaria contorta, Bast, - 
-Lajonkairi, Nyst 
Capulus ungaricus, L. 
Cassidaria ttcatenata, J. Sow. 
*Cassis saburon, Brug. 
Cerithlum granosum, aS, Wood 
-tricinctum, Broc. 
-tuberculare, Mont. - 
Chemnitzia elegantissima, Mont. 
-similis, S. Wood 
Chenopus pes-pelicani, L. 
Clavatula, see Pleurotoma. 
*Conus Dujardini, Desk. 
Cylichna cylindracea, Penn. 
-—. umbilicata, Mont. 
Cyprsea europeea, Mont. 
