132 



THE LIAS AMMONITES. 



LaMELLIBRANCHI ATA . 



Ostrea subauricularis, d'Orb. 

 Pecten incrustatus, Defrance. 

 Gervillia Eseri, Oppel. 

 Avicula striata, Ziet. 

 Lima galatea, d'Orb. 

 Trigonia literata, Phill. 

 Leda ovum, Sow. 

 Goniomya rhombifera, Ooldf. 



Discina papyracea, Milnst. 



Acrosalenia crinifera, Qvienst. 

 Pentacrinus BoUensis, Schloth. 



Posidonomya Bronni, Volte. 



— radiata, Goldf. 



— orbicularis, Munst. 

 Inoceramus undulatus, Ziet. 



— cinctus, Goldf. 



— dubius. Sow. 

 Solemya Voltzi, Rbmer. 



Brachiopojda. 



I Spiriferina villosa, Quenst. 



ECHINODERMATA 



I Pentacrinus fasciculosus, ScJiloth. 



— Quenstedi, Oppel. 



In France the Posidonomya-hQAs attain a considerable development and are found 

 in many Departments ; they have been described in the Moselle by M. Terquem,^ vi^here 

 they consist of («) " Marnes bitumineuses," {h) " Cakaire noduleux," and (c) " Calcaire 

 f/reseux." The petrology of these divisions is certainly distinct, but several of the species 

 of organic remains are common to the three, and all are characteristic of the lower 

 portion of the Upper Lias. 



In Luxembourg these beds have been described by Drs. Chapuis and Dewalque^ as 

 " Marne de Grand-Cour," vrhich consists of a bituminous schist at the base and bluish 

 marls with calcareous nodules in the upper part. The Marne de Grand-Cour has been 

 worked at Aubange for the preparation of bitumen, and from these exposures thti 

 remains of Reptiles, Eishes, Crustacea, and Cephalopods have been collected. The 

 following Ammonites from the lower zone have been figured by these authors : — 

 Harpoceras serpentinum, Harp. Lythense, Harp, complanatum, Fhylloceras heterophyllum, 

 Lytoceras cornucopice, Stephanoceras Baquinianum, Steph. Holandrei, Steph. mucronatum, 

 StepJi. Braunianum. And from the upper zone : Harv. radians, Harp. Levesquei, Harp. 

 variaiile. Harp. Comense. 



In the Department of the Ardennes it has been described by Buvignier as the 

 upper marls of the Upper Lias ; here, likewise, a bituminous schist forms the base, and 

 marls the upper portion, of the series. 



In the Meurthe M. Lavallois describes these strata as " Marnes schisto- 



1 ' Paleontologie du Depart, de la Moselle, Ext. de Satist. de la Moselle,' p. 20, 1855. 



2 ' Lias de la Province de Luxembourg,' p. 60, 1857. 



