1852.] 



PRESTWICH ON THE THANET SANDS. 



249 



c Common. r Rare. 

 cc Very common. rr Very rare. 

 ccc Very abundant. 



i 



p 



^1 





FORAMINIFEKA. 



Nodosaria bacillum, Defr r 



Cristellaria platypleura, Jones c 



* 



* 

 * 



* 

 * 

 * 

 * 

 * 

 * 

 * 



* 

 * 



* 



* 



* 

 * 



Occurs in the L. Clay. 

 Occurs in the L. Clay. 



Wetherellii, Jones c 



Rosalina Marias, Jones tt 





Polymorphina ampulla, /owes rr 



, sp rr 



Miscellanea. 



Scales and small bones of Fislies rr 



Traces apparently of Crustaceans rr 



Traces of carbonized plants and frag- 

 mentary vegetable impressions cc 



Long tubular casts, probably fucoidal 

 or spongiform c 



Sponge spicula. 



Oviform bodies, filling tubular cavities. 



{a.) This vras first referred to the Natica labellata, which is quoted by M. d'Ar- 

 chiac as occurring in his " Sables Inferieurs," but not in the lower stage of it. 

 M. Melleville also gives it from his lowest division of these sands near Rheims. 



(a*.) The only species of Dentalium given by Nyst, from the " Systeme Lande- 

 nien," is the D. strangulatum. 



(af.) This very much resembles a species brought by Sir Charles Lyell from the 

 Lower Tertiary sands (" Systeme or Terrain Landenien " of Dumont) of Folx-les- 

 Caves in Belgium, but the specimen is a cast, and not sufficiently perfect for posi- 

 tive identification. 



{b.) The specimen is very imperfect, and may be the young of the preceding fine 

 specimen, which is in the collection of Mr. Bowerbank. M. Nyst, on the autho- 

 rity of Galeotti, quotes the Scalaria acuta ?, Sow., which is a Barton species, from 

 the '' Terrain Landenien " of Folx-les-Caves. 



ic.) One of these much resembles the Area depressa. Sow., which occurs in the 

 Woolwich clay beds. 



{d.) M. Nyst figures a specimen from the " Terrain Landenien " of Folx-les- 

 Caves, and names it A. incequilateralis. It closely resembles the English species. 



(e.) M. Melleville gives this species amongst the fossils of his lowest division of 

 the " Sables Inferieurs." 



(/!) It is doubtful whether this be not the species figured by M. Deshayes as the 

 C. Scutellaria, a species mentioned both by M. D'Archiac and M. Melleville as of 

 not uncommon occurrence in the lowest division of their " Sables Inferieurs." 

 The figure given by Nyst of a specimen from some of the much more recent Ter- 

 tiaries of Belgium is probably not Deshayes's species. 



{g.) One of these species may possibly prove to be the Cytherea Bellovacina, 

 Desh., which Deshayes states to be common in parts of the '* Sables Inferieurs " 

 of the North of France. M. Melleville also gives it. 



{h.) This is also a characteristic species of the "Sables Inferieurs" of the North 

 of France. M. d'Archiac places it in his 3rd division (reckoning upwards from 

 the chalk) ; M. Melleville in his lowest. 



(i.) M. Nyst figures a specimen (L. Galeottiana) which a good deal resembles the 

 smaller Pegwell Bay species. Amongst other deposits in which it is found, he 

 mentions the " Terrain Landenien." 



{j.) This occurs in the " Sables Inferieurs " of Beauvais. 



(k.) The Panopcea occurs in the " Systeme Landenien " of Belgium, and in 

 the " Sables Inferieurs " of France. 



(I.) This is apparently the P. Koninckii of Nyst, who figures it as a characteristic 



