58 
LENHAM BEDS. 
Quite recently another well has been bored further north, at 
Diemerbrug, near Amsterdam. This boring reached a depth of 
1,096 feet without penetrating any deposits that could be referred 
with certainty to the Diestian, A fuller account of the boring 
will be found at p. 220, but owing to the doubt as to their exact 
horizon the fossils have not been incorporated in the tables in this 
volume. 
The Belgian list includes two southern forms unknown in 
Britain. These are Scalaria Hennei, thought by Nyst perhaps to 
he referable to /S». delicatula of the Canaries, and the Conus^ which, 
though an extinct form, belongs to a decidedly southern genus; 
both these shells are rare. The cone, though unknown in place 
in Britain, has been found in the derivative “ Box Stones ” at the 
base of the Crag (see p. 13). 
At Lenham the southern character of the fauna is much more 
noticeable ; for though the list from that locality is considerably 
smaller 4han that from Belgium, it contains about a dozen southern 
species unknown in Belgium, and four of them are unknown 
in the Coralline Crag ; besides which some of the Mediterranean 
forms rarely found in the Coralline Crag occur at Lenham in 
abundance. From Lenham about 67 species have now been 
determined. Among these we find such southern genera as 
Ficula {Pyrula\ Xenophora (Phoms), Triton- and Aviciila, 
while the profusion of Area diluvii and Cardium ■papillosum helps 
to give a distinctly Mediterranean character to the fauna, borne 
out also by the extinct south European species of Pleurotoma and 
Terehra associated with them. The few fossils not belonsino; to 
the mollusca point in the same direction. The polyzoon Cupu- 
laria canariensis is often found, but now lives only in the warm 
seas of Madeira and the Canaries ; another species, the extinct 
Fascicularia aurantium^ of which a single specimen has been met 
with at Lenham, is a well-known and characteristic Lower 
Pliocene form. Spines of Diadema are common; as are the 
tubes of Ditrupa subulata, an annelid usually found at depths 
varying from 60 to 120 fathoms. 
