Zoological Characters in Geology. 



^49 



to perceive their difference they must be placed close to- 

 gether ; some species are perfectly identical. The follow- 

 ing comparative list, derived from the shells which I obtained 

 in great numbers on the spot, and from those collected by 

 Messrs Deluc since 1750, which have been obligingly sent me 

 by M. J. A. Delucj will suffice to give a precise idea of these 

 relations. 



Organic remains of the green sand of the Perte du Rhone, 

 near Bellegarde : 



Belemnites Undeterminable. 



Ammonites inflatus . . .Sow. (pi. vi. fig. 1.) . 



• Deluci . . . . 

 ' canteristus . 



.A.Br. (pi. vi. fig. 4.)... 

 .Defr. (pi. vi. fig. 7.)... 



subcristatus . . , 



Beudanti 



Hamites rotundus . , 



— — funatus 



canteriatus .. . 



Turrilites Bergeri . . 

 Trochus Gurgitis . . . 



Trochus ? Rhodani , 



"From Rouen & Havre, 

 it greatly varies in 

 size. The increase of 

 the last whorl is not 

 very sensible in small 

 individuals, 



.Collection of Deluc. 



Collec. of Deluc. It 

 very much resembles 

 A.cristatus fromFolk- 

 stone. 



.Deluc (pi. vii. fig. 10.) . . 



.A. Br. (pi. vii, fig. 10.) . . . .Coll. of Deluc. 



f From Rouen, 

 . Sow. (pi, vii. fig. 6.) . . . •< are orthocerat 

 t,De Saussure. 



. A. Br. (pi, vii, fig, 7.) Coll, of Deluc 



. .A. Br. (pi. vii, fig. 8.) , 

 .A. Br, (pi. vii. fig. 3.) , 

 .A. Br. (pi. ix, fig. 7.) . 



Coll, of Deluc. 



, . . . Coll. of Deluc. 



,...Coll. of Deluc. 



.A, Br, (pi, ix. fig, 8,) ...^nl 



Trochus? Cirroides , .A, Br, (pi. ix. fig. 9,) 



Cassis avellana 



Ampullaria ? 



Eburna .' 



Carithium excavatum 



is also found at Lig- 

 roUe above Qrbe, 



f"The cast of this shell 

 J occurs in the chalk 



■ y at Rouen, Havre, and 

 (_Brighton. 



TAt Rouen also. They 

 J are at first sight taken 



■ Jfor turbines and am- 

 ^puUariae, 



An indeterminable interior cast. 



.A.Br, (pi. vi, fig, 10.).. 



A, Br, (pi. ix. fig. 10.) Coll, of Deluc, 



