32 



THE LIAS AMMONITES. 



The Angulatum-zone, as shown in this table, is well developed in North Germany, as is 

 proved by the valuable works of the late Professor U. Schlonbach and " Der untere Jura " of 

 Dr. Brauns, from which it appears that many of the organic remains of the Planorbis- 

 beds pass into the Angulatum-zone, and that it is difficult to draw a divisional line 

 between them. The following list affords a correct idea of the Molluscan fauna of the 



N orth-German Angulatenschichten. 



Cephalopoda. 



Aegoceras angulatum, Schlotheim. 



Hydrobia Krausseana, Dkr. 

 Turritella Zenkeni, Dkr. 

 Mesalia turritella, Dkr. 

 Pleurotomaria Anglica, Sow. 



Ostrea sublamellosa, Dkr. 

 Gryphsea arcuata, Lamk. 

 Pecten textorius, Schlth. 

 Lima pectinoides, Sow. 

 Leda Renevieri, Opp. 

 Macrodon pullus, Tgm. 

 Inoceramus pinnseformis, Dkr. 

 Gervillia Hagenovii, Dkr. 

 Avicula inaequivalvis, Sow. 

 Pinna Hartmanni, Ziet. 

 Modioia Hillana, Sow. 



— nitidula, Dkr. 



— scalprum, Soto. 



Pentacrinus, sp. 



Nautilus intermedius, Sow. 



Gasteropoda. 



Pleurotomaria rotellseformis, Dkr. 

 Cylindrites fragilis, Dkr. 

 Dentalium Etalense, Terq. et Piette. 

 Discohelix pygmsea, Dkr. 



Lamellibranchiata. 



Astarte obsoleta, Dkr. 

 Cardinia concinna, Sow. 



— crassiuscula, Sow. 



— Listeri, Sow. 

 Unicardium cardioides, Phill. 

 Cardium Heberti, Tqm. 

 Protocardia Phillippiana, Dkr. 

 Isodonta elliptica, Dkr. 

 Pholadomya corrugata, Dkr. 

 Goniomya heteropleura, Agass. 



— subrugosa, Dkr. 



— liasina, Schilbl. 

 Gresslya Galathea, Agass. 



ECHINODERMATA. 

 Hypodiadema lobatum, Desor. 



Cid 



ans, sp. 



The Angulatum-beds are well developed in Wiirttemberg ; and the Stuttgart Museum 

 contains a very fine series of the leading fossils, as Aegoceras angulatum, A. Moreanum, 

 A. compressum, A. Liasicum, and many other Mollusca. Some of the Ammonites are 

 upwards of one foot in diameter, and were collected from the Lias a near that town. I 

 have one nearly as large sent me by my esteemed friend Prof. Eraas. 



In Erance this zone is found in several Departments, as in the C6te-d'Or, and is 

 remarkable for the very rich fauna it has yielded to the researches of M. Martin and MM. 

 Collenot and Breon. In this zone likewise are found, in the Commune of Thoste, and at 

 the hamlet of Beauregard, the remarkable ferruginous beds which have yielded such an 

 immense quantity of Cardinias. These shells are in admirable preservation, fossilized by 

 iron, and present all the characters of their internal structure. The Ammonites 



