PALAEOZOIC CLASSIFICATION APPLIED TO FRANCE AND SPAIN. 3* 
eastern tract of the Hartz. Again, in Franconia and the country around Hof, 
upon the southern flank of the Fichtelgebirge, true carboniferous and Devonian 
rocks exist, like those of the Rhenish and Belgian tracts ; but the lower grauwacke 
series is, it must be admitted, a very imperfect representative of the Silurian system, 
though a tract of slaty rocks around Schleitz in which Graptolites abound, is really, 
we think, of that age. Throughout large mountainous tracts in central Germany, 
as in the Riesen Gebirge, and particularly in the eastern termination of that chain 
between Breslau and Glatz, where there are distinct carboniferous and Devonian 
limestones (the former overlaid by a productive coal-field), no Silurian strata can 
he detected. Thus also is it in the southern portion of the kingdom of Poland (for 
we have recently examined all these tracts) , where the mass of the palaeozoic rocks 
around Kielce, and formerly described by Pusch, are unquestionably Devonian, 
and are succeeded on the west by carboniferous limestone and a great productive 
coal-field, dhus, indeed, in Northern Moravia, the oldest limestone wherein or- 
ganic remains have been found, must also be considered Devonian. 
In one tract, however, of Germany, — in that, namely, around Prague, — which 
has been long celebrated for the number and beauty of its Trilobites, and where 
favouring sedimentary conditions prevail, the Silurian strata are richly developed. 
In a journey through Bohemia in 1843, we were much gratified to find, that by 
assiduous labours, M. Barande had made a copious collection of fossils in the en- 
virons of that city, and had identified many of them with published Silurian types. 
Hie collections of this geologist, from the limestones and shales of the district 
around Prague, present an assemblage which leaves no doubt of the age of the de- 
posit. Thus amongst the corals and Graptolites, are found the Catenipora escharoides 
and Graptolites Ludensis ; among the Bracliiopods, Leptcena euglypha, L. depressa, 
Terebratula Wilsoni, Terebratula reticularis, with Cardiola interrupta, & c. In a pro- 
fusion of chambered shells (and forty-five forms of Orthoceratites have already 
been collected), the Orthoceras Ludense, O. gregarium, 0. excentricum, have been re- 
cognized, with Lituites, Cyrtoceras, Phragmoceras, and Gomphoceras, some of the 
species of which, if not absolutely identical, approach very closely to the pub- 
fished Upper Silurian forms ; whilst amidst a multitude of Trilobites, the Asaphus 
c audatus and Calymene macrophthalma are unquestionable types of that age. 
fihe strong analogy between the Silurian rocks of Bohemia and England is still 
further sustained by evidences of a Lower Silurian group composed of quartzose 
sandstones, in which Trinuclei have been found, one of which is undistinguishable 
