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the beds comprises a number of species of fossils, recorded by 

 Oppel as marking the Upper part of the Margaritatus Zone. 

 rinallj, he observes of the whole, that in North Germany Am. 

 Margaritatus comes most in clay beds, whilst Am. Spinatus 

 mostly occurs in the grey limestone strata. Both of these are 

 met with at different levels ; Am. Spinatus in the upper, and 

 Am. Margaritatus in the lower beds. In North Germany he 

 thinks, further, that it wants a special study of the localities in 

 order to determine truly and distinctly the uppermost part of 

 the Middle Lias constituting the Spinatus Zone. Before 

 dismissing this part it would be well to notice a comparatively 

 recent work on the Jura in North West Germany, by Dr. 

 Bkatjns, published in Brunswick, 1871. We do not find 

 ourselves in accord with the writer at certain stratigraphical 

 points, yet on the whole it is a meritorious work ; his treatment 

 of the palseontology is marked by scholarly painstaking, though 

 withal, a certain Allgemeinheit is not wanting. The historical 

 part is more open to remark ; for instance, in treating of the 

 English Lias in Der untere Jura, at p. 157, he seems to have 

 adopted the general statements of De La Beche for Dorsetshire, 

 and the earlier works of Phillips for Yorkshire ; so that on 

 such critical matters as the possibility of separating a Spinatus 

 Zone from the Margaritatus (Amaltheenthone), his views are 

 somewhat obsolete. Our object has been simply to offer an 

 illustrative, and by no means complete narration of the instances 

 where the Spinatus Zone is exemplified on the Continent or 

 elsewhere. We, therefore, end by mentioning in addition, that 

 these strata have been examined at Aldorf in Bavaria ; on both 

 sides of the main channel of the Danube, where they are 

 extensive and characteristic, containing numerous leading 

 fossils contained in geodes : and, moreover, have recently been 

 traced and described by Dr. Johann Bockh, in the southern 

 portion of the Bakony, the country south of Buda Pesth, 

 traversed by a tributary of the Danube. Consult a valuable 

 memoir containing an account of the Palaeontology of this 

 district in "Die Geologischen Verhaltnisse des Siidlichen Theiles 

 des Bakony. 11 Theiles, Pest, 1874." From the Middle Lias of 



