SPEETON CLAY. 



121 



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 OP THE SPEETON CLAY. 



EEMAINS OF PLANTS. 



Wood, having the structure of dicotyledonous plants ... Knapton, Speeton. 



Caryophyllia conulus 



Spatangus argillaceus 



ZOOPHYTA. 

 PI. II. fig. 1. 



BADIABIA. 



fig. 4. 



Cidaris, plate and spines ... fig. 2, 3, 5. 



Pentacrinus caput Medusae (Miller's Crinoidea.) 



A round crinoidal column ... ... . 



Mya depressa (Min. Conch.) 



Mya phaseolina 

 Pholas ? constricta 



MOLLUSCA. 

 fig. 8. 



fig. 13. 

 fig. 17. 



R 



Speeton, also in blue marl, 

 C ambridgeshire. 



Speeton, also Wiltshire and 

 Sussex ? in blue marl. 

 Speeton. 

 Ditto. 



Ditto, also in green sand, 

 Wiltshire. 



Speeton, also in Kimmer- 

 idge clay, Dorsetshire. 

 Speeton. 

 Ditto. 



