and on the Fossil Remains contained in them. 147 



In the French stratum there occur. 



Two Lttuolites. No species of this genus is noticed as 

 having been seen in our English chalk. But research has 

 not been nuuie with the necessary precision. 



Three Fennia/liles. The fossil figured Org. Rem. vol. iii. 

 pi. vii. fig. ] I, was considered as a vermiculite, until byre- 

 inoval of the chalk and opening different specimens it was 

 found to be a chambered and an adherent shell. Should 

 these centlenien not have perceived these circumstances in 

 the specimens they met with, they would certainly regard 

 this fossil as a vermiculite. It must also be observed, that 

 from the different forms in which the spiral part is disposed, 

 its division into two or three species might be auiiiorised. 



Belcmnites. These, according to M. De France, are dif- 

 ferent from those which accompany the ammonites of the 

 compact limestone. The helernniics of our chalk are smaller 

 than those of (he limestone, besides which they are different. 

 in form, being narrower and more elongated. But M. De 

 France may also have confounded with them the spines of 

 the echinus^ which so closely resemble the Z'e/^w«i/f; if that 

 gentleman should not have met with perfect Specimens, he 

 might not be able to remark tlie difl'erence between these 

 two fossils. The characters which he has noticed are how- 

 ever sufficient to lead to the belief of a correspondence be- 

 tween the French and English fossils. 



Fragments of a thick shell of a Jibrous structure. — The 

 doubts expressed respecting the nature o!"' this shell, and the 

 observations made with regard to it, offer another strong 

 point of agreement between the shells of the two strata. 

 The shell here alluded to is most probably that rcprc'-entcd 

 Org. Rem. vol. iii. pi. v. fig. 3; the structure of which 

 agrees exactly with that mentioned as found in the French 

 stratum of chalk. That shell is however described as being 

 of a tubular form ; it is therefore right to observe, that fos- 

 sil piviice do sometimes pi.ssess this peculiar structure. 



A Muscle. No mstance appears in which any shell of 

 this genus has been found in our chalk. 



Two Oysters. The Kentish chalk-pits yield at least three 

 species ot this genus. One of them bearing very much the 

 form and appearance of Oilrea edulis, but being only about 

 a fourth of its size; one smaller, the serrated edge of which 

 places it in the family of Crintce gnlli ; and the third stdl 

 smaller, not half an inch in lengtii, crenulaled on each side 

 of the hinire. 



A species of Pecten. There are two or three small species 

 K3 of 



