236 



M. BUONGNIART oti the 



G^-pTiasa aqiiiki ..... A. Br. (pi. ix. fig. 1 1.). . . < 



Peetfen qbinquecostatusSow. (pL iv. fig. 1.) , 



lima or Plagiostoma pectinoides. . Sow 



Spondylus? Strigilis. . A. Br. (pi. ix. fig. 6.).,. . 



tm, ■ ■ ■, K Lam. Park. Organic rem. 



Tngoma rugosa?. . . ^ ^^, .^.._ ^^^ j^^^^ „_ 



**'*"*'^ " I (pi. ix. fig. 5.) 



Inoceramus concentricusPark.(pl. vi. fig. 11.). . . 

 sulcatus Park, (pi, vi. fig. 12.). . . 



fCpll; of Deluc. These 

 are the shells noticed 

 as oysters by De Saus- 

 sure. I consider this 

 gryphite as of the 

 same species as that 

 found near Rochelle, 

 (fig. 11. C,) in a rock 

 which also bears a 

 great analogy to that 

 .of the craie tufau. 



r Coll. of Deluc- At 

 •J Rouen, Havre, & all 

 t chalk rocks. 



. . Coll. of Deluc. 



Lutraria Gurgitis A. Br. (pi. ix, fig. 25.). 



Terebratula Gallina. . . A. Br. (pi. ix. fig. 3.). . 



ornithocephala. . . Sow 



Spatangus Isvis Deluc. (pi. ix. fig. 12.) 



Gdarites Variolaris ... A. Br. (ph v. fig. 9,). . 

 Orbitolites lenticulata Lam. (pi. ix. fig. 4.).. 



..Coll. of Deluc. 



I Coll. of Deluc. 



) Coll. of Deluc. 

 5 Rouen. 



Folkstone and Rouen. 



Folkstone. 



r This Species is well 

 I characterized, & dif- 

 .•< fers from that found 

 I in the marls of the' 

 LJura limestone. 



. . . Coll. of Deluc. 



...Coll. of Deluc. 



f The same with those 

 , -< found in the green- 

 t.sand of Havre. 



\ Lenticular stone of 

 ■ I the Perte du Rhone. 



This last girest ne, as we have said, numerous shells of the 

 chalk epoch, but it does not afford us any shell either of the 

 inferior or older rocks, or of the upper and newer rocks. 



These considerations are sufficient to lead us to the con- 

 clusion, that the green sand resting on the Jura limestone at 

 the Perte du Rhone belongs to the inferior chalk formation ; 

 that this rock, analogous to the green sand of the English 

 geologists, as they themselves admit, is seen almost imme- 

 diately in contact with the fine compact Jura limestone, 

 and that it is only separated from it by an argillaceous marl, 

 a disposition analogous to that observed in France, at Cap 



