102 



THE LIAS AMMONITES. 



and Lyt. lineatum, and in the upper zone Amal. marfjarilaluH is associated with Amal. 

 spinatuH. It would appear that Amal. ma</aritatus has a considcraV)le vertical range, 

 both in Germany and France, and thereby links together the llenleyi and Hpinatm 

 horizons in these countries by a persistent Cephalopodous type. Amaltheus maryaritatuH 

 is thus remarkable alike for its zoological characters, and its wide distribution in time 

 and space. 



In France the Maryarilulua-hii^iS^ are exposed at Vicux-Pont, Calvados. Professor 

 Deslongchamps^ has given a section of this, which evidently represents the English 

 Marlstone ; it consists of a Rock-bed about five feet in thickness, enclosing a large 

 assemblage of fossils, of which the most characteristic are AmaL maryariiaiiiH, Amal. 

 spinatuH, Bclemnites nir/er, Pecien aquivalvift, Pecten disci/ormis, Lima punctata, 

 Terebratula quadrifida, Ter. cornuta, Ter. punctata^ T^r. Edwardsii, lihjnchondla acuta, 

 Phyn. tetracdra, Spiriferina rostrata. Its upper portion is characterised by a particular 

 stratum charged with small Gastropods of the genera Turbo, Ccrithium, Toraatclla^ 

 Actaonina, and sometimes Pleurotomaria precaloria. In the adjoining region, as at 

 £vrecy, Landcs, Curcy, and Croisilles, the same bed is found maintaining its lithological 

 and {)ala;ontological characters with a remarkable constancy. This zone has an extensive 

 distribution in other Departments of France, and the characteristic Ammonites are found 

 near Nancy, Mcurthc ; Saint-Rambert, Ain ; Venarey, near Semur, and Pouilly in 

 Auxois Cote d'Or; St. Amand, Cher; Metz, Moselle; Avallon, Yonne; near Lyons, 

 Rhone ; Clapier and Rose, Aveyron ; where it is associated with a number of new 

 Ammonite forms that apj)ear to be special to the Mediterranean area. 



The late Dr. Reynes, of Marseilles, collected, figured, and described these Ccphalopods, 

 which were chiefly obtained from the Mar(/aritatus-h{n\i^ at Clapier, Rose, Riviere, 

 ^J'ournemire ; and has given the following remarkable list^ from this portion of the Depart- 

 ment of the Aveyron : 



Cephalopoda. 



Relemnites el ongatus, Mill. 



— niger, Mill. 



— breviformis, Voltz. 

 Nautilus, sp. 



Ammonites spinatua, liruy. 



— margaritatuH, Monff. 



— mimatcriBiH, iVOrh. 



— yEgion, tVOrh. 



— Kagazzoriii, llauer. 



— acaritboidcH, Itcyncs. 



— pseudoradians, Rey. 



— NilsBoni, lUhert. 



Ammonites Algovianus, Oppel. 



— Albert), Key. 



— Ilerbeti, Hey. 



— ruthenensis, Rey. 



— Partscbi, Stur. 



— Boscensis, Rey. 



— LoHcombi, Sow. 



— Kurrianus, Oppel. 



— instabiliw, Ray. 



— I'ieldirigi, Rey. 



— plainspira, Rey. 



— disciformis, Rey. 



' ' itudes 8ur leg ]5tages JurasB. infer, de la Normandic,' p. .01, XHiW. 

 2 ' Geologic et de Paleontologic Aveyronnaises,' p. .00, ISfiS. 



