in the Viciniti/ of Lyme Regis, Dorset, and Beer, Devon. Ill 



with thenij and thence acquiring considerable hardness. It is difficult to say 

 whether these grains have been mechanically rounded by attrition against each 

 other^ previous to their envelopement in the Chalky or whether they are of 

 contemporaneous origin with it ; — it is however most probable that they are 

 of mechanical origin. The thickness of this division is about 20 or 30 feet, 

 and at the bottom of it there is a very hard compact bed, about 3 feet thick_, 

 in which the quartz and siliceous matter greatly predominate, giving to the 

 whole a very siliceous character. This bed is of a browner tint than the 

 Chalk above it, and may thus be easily recognised in Pinhay, Whitelands, 

 Charlton, Rusedon, and Dowlands, the separation between the two being 

 rather marked as to colour. This bed, for the present, I class with the Chalk 

 containing quartz-grains, as it agrees more with that than with the sandstone 

 beneath it ; — the surface of the bed next to the Chalk with quartz -grains, 

 contains numerous organic remains, which, with those contained in the whole 

 of this division, are as follows : 



Palates and teeth of fish. 



An Encrinite. 



Alcyonia. 



Echinites. 



Cidarites variolaris A. Br. (Env. de Paris, PI. V. fig. 9.) 



(another species, not determinable). 



Echinus areolatus Wahlenb. This appears to be the E. Leucorho- 



dion of Mr. Konig's arrangement in the 

 British Museum. 



Galerites vulgaris Lam. 



albo-galerus . . . Lam. (Env. de Paris, PI. IV. fig. 12.) 



Nucleolites depressa .... A. Br. (Env. de Paris, PI. IX. fig. 17.) 

 Ananchytes hemispherica. . Lam. (Env. de Paris, PI. V. fig. 8.) 



Echinonaus lampas De la Beche (Geol. Trans. 2d series, vol. i. 



Pi. III. fig.3, 4, 5.) 

 Spatangus cor anguinum . . (Env. de Paris, PI. IV. fig. 11.) 



■ laevis Deluc. (Env. de Paris, PI. IX. fig. 12.) 



Spines of Echinites by no means rare. 



