SPEETON CLAY. 
93 
The fossils, however, which are known to occur in the chalk of York- 
shire, are precisely those which have been always noticed by geologists 
as of most extensive occurrence in that stratum. The ananchytes, spatan- 
gi, inocerami, and belemnites, are precisely the shells which have been 
long since pointed out by Smith, Webster, Parkinson, and Mantell, as 
characteristic of the English chalk ; and the same species have been re- 
cognised by Brongniart in the same stratum, not only over the wide 
surfaces which it occupies in France, but in the Netherlands, along the 
shores of the Baltic, and in Poland. It deserves attention that the in- 
teresting remains of spongias are nowhere so well developed as in 
England, and perhaps nowhere in England so well as in Yorkshire. 
On the shore near Bridlington, they lie exposed in the cliffs and scars, 
and, being seldom enclosed in flint, allow their organization to be studied 
with the greatest advantage. 
FOSSILS OF THE SPEETON CLAY. 
REMAINS OF PLANTS. 
Wood, having the structure of dicotyledonous plants . . . Knapton, Speeton. 
ZOOPHYTA. 
Caryophyllia conulus 
PI. II. fig. 1. 
Speeton. 
RADIARIA. 
Spatangus argillaceus ... ... fig. 4. 
Cidaris, plate and spines ... fig. 2, 3, 5. 
Pentacrinus caput Medusae (Miller’s Crinoktea.) 
A round crinoidal column 
Speeton. 
Ditto. 
Ditto. 
Ditto. 
MOLLUSCA. 
Mya depressa (Min. Conch.) 
Mya phaseolina ... 
Pholas constricta 
Pholadomya decussata, (Mantell) 
fig. 8. ... 
fig. 13. ... 
fig. 17 . ... 
fig. 9. 
Speeton. 
Ditto. 
Ditto. 
Ditto. 
