133 



THE LIAS AMMONITES. 



Lamellibranchiata. 



Ostrea subauricularis, cfOrb. 

 Pecten incrustatus, Defrance. 

 Gervillia Eseri, Oppel. 

 Avicula striata, Ziet. 

 Lima galatea, d'Orh. 

 Trigonia literata, Phill. 

 Leda ovum, Sow. 

 Goniomya rhombifera, Gold/. 



Discina papyracea, Munst. 



Acrosalenia crinifera, Qaenst. 

 Pentacrinus BoUensis, Schloth. 



Posidonomya Bronni, Voltz. 



— radiata, GolJf. 



— orbicularis, Miinst. 

 Inoceramus undulatus, Ziet. 



— cinctus. Gold/. 



— dubius, Sow. 

 Solemya Voltzi, Romer. 



Brachiopoda. 



I Spiriferina villosa, Quenst. 



Echinodermata 



I Pentacrinus fasciculosus, Schluth. 



— Quenstedi, Oppel. 



In France the Fosidonom^/a-heds attain a considerable development and are found 

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

 they consist of (a) ^' Marnes diiumineuses," {b) " Calcaire noduleux" and (c) " Calcaire 

 greseux!^ 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-Co^ir" which 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 the 

 remains of Reptiles, Pishes, Crustacea, and Cephalojjods have been collected. The 

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

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

 Lytoceras cornucopicB, Stejjlianoceras Maquiniaiium, Stepih. Holandrei, Steph. mucronatum, 

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

 variabiles 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 Meurthc M. Lavallois describes these strata as " Marnes schisto- 

 bitumineuses.''' 



1 ' Paleontologie du Depart, de la Moselle, Ext. de Satist. de la Moselle,' p. 20, 185.i. 



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



