180 Mr. Webster on the Strata lying over the Chalk. 



Scaphites : a new genus by Mr. Parkinson. See his Organic 

 Remains, vol. 3. 



Turrellites, three species, 



Trochus. 



Madreporse. 



It has been remarked by the French naturalists that in their chalk 

 there is not any univalve shell with a simple and regular spire. In 

 the chalk of this country, univalves, as the trochus, do sometimes 

 occur. They may probably however be rather the fossils of the 

 green sand below the chalk, which have been enveloped in some of 

 the depositions of the chalk formation, or in the chalk marl, for 

 they are frequently accompanied by green earth. 



The following Fossils are found in the Chalk in the Environs 



of Paris. 



Belemnites ----- Perhaps two species : they appear 



to be different from those in the 

 compact limestone. 



Lentlculltes rotulata. 



Lltuolites nautiloidea. 



difformis. 



Pinna ------- It is not certain that the large frag- 

 ments of 12 millimetres in thick- 

 ness and of a fibrous texture, which 

 are found in the chalk belong to 

 this genus. M. Defrance has por- 

 tions of a hinge which indicate a 

 different genus. Cuv. p. 11. 



