138 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 3, 



referred to the Subapemiine formation (although here I am bound 

 to say that Prof. Beyrich is distinctly of opinion that these beds have 

 been placed too high by Philippi) ; and then we come to the sands of 

 Magdeburg, which are referred to the Lower Limburg, or even to the 

 Barton clay ; while the overlying Septaria-clays are referred to the 

 Riipelmonde system. There can be no doubt that Philippi, in his 

 endeavours to point out the errors of his predecessors in referring 

 the marls and sands of Cassel to the Plastic clay and the Calcaire 

 grossier respectively, greatly overshot his mark and placed these 

 beds too high. 



The following is the list of fossils which appear to be common to 

 the Hesse Cassel and Weinheim beds. A more complete list of 

 synonyms would undoubtedly have enabled me to extend it ; but, 

 even as it stands, it marks a great resemblance between the two 

 formations. 



List of Fossils common to the Hesse Cassel and Weinheim Tertiary 



Deposits. 



Panopaea intermedia, Sow. Pecten striatus, Milnst. <^ Goldf. 



Corbula striata, Lam. Eulima subulata, Risso. 



Cy prill a rotundata, Braun. Scalaria rudis, Phil. 



Cardita scalaris, Goldf. pusilla, Phil. 



Cardiura turgidum, Brander. Cerithium lima, Brug. 



Area dihivii, Lam. Tritonium argutura, Brand. 



Pectuuculus crassus, Phil. Pleurotoma belgicum, Goldf. 



Nucula margaritacea, Lam. Cassidaria depressa, v. Buck. 



placentina, Lam. Cypraea inflata, Lam. 



minuta, Defr. Bulla concinna, Wood. 



Modiola micans, Braun. Lamna denticulata, Ag. 



Pecten decussatus, Milnst. 8( Goldf. Notidanus primigenius, Ag. 



At page 293 of my former communication* I have given a very 

 imperfect list of the fossils found in the Glauconite-Sands of Westere- 

 geln ; imperfect, because it only contains the names of eighty-seven 

 species, whereas I am informed that the total number of species found 

 in that locality amounts to three or four times that number ; and yet 

 that imperfect list contains twenty-five species common to the Wein- 

 heim and Westeregeln formations. 



The resemblance between the Hesse Cassel and the Westeregeln 

 beds, however, is by no means so great. In the lists which I have 

 had an opportunity of consulting I do not find more than five or six 

 species common to the two formations. 



I have already mentioned that, according to the views of Pro- 

 fessor Beyrich, there are two distinct formations belonging to this 

 period in the north of Germany, viz. the Sands of Westeregeln, and 

 the Septaria-clay of Brandenburg, Berlin, &c. I am not aware that 

 any evidence has yet been discovered of an intermediate bed of sepa- 

 ration, or even of the distinct superposition of the Septaria-clay over 

 the Sands of Westeregeln. The evidence of such distinction depends 

 mainly on their fossil contents ; but, even admitting the super- 

 position, the change of sedimentary deposit in which the fossils occur, 

 from a Glauconite-sand to a blue clay or marl containing Septaria, 



* Quart. Journ. Geol. Soc. No. 39. 



