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1838. 



Archiac, E. J. A. d'. Observations sur le groupe moyen de la forma- 

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[Cretaceous. 

 1839. 



HagenoTV, F. von. Monographic der Riigenschen Kreide -Verstei- 

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1840. 



Roemer, F. A. Die Versteinerungen des Norddeutschen Kreidege- 

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[Cretaceous. 

 1841. 



Michelin, H. Iconographie zoophytologique: Description par loca- 

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1845. 



Lonsdale, W. Account of six species of Polyparia obtained from 

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1846. 



Reuss, A. E. Die Versteinerungen der bohmischen Kreideformation. 

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1849. 



Orbigny, A. d'. Description de quelques genres nouveaux de Mol- 

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1850. 



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Orbigny, A. d'. Paleontologie Fran^aise. Description des Animaux 

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[Cretaceous. 



