1863.] MURCHISON BAVARIA AND BOHEMIA. 365 



from want of time, I had no power to sift the question at issue, 

 and I therefore resolved not to examine any one of the sections of 

 M. Lipoid or of M. Crejci, which had been brought forward in anta- 

 gonism to M. Barrande. My main object, I stated, was to see how 

 the lower part only of the great deposit of grauwacke-slate, in parts 

 alum-slate, in parts flinty-slate, which overlies the Thon-Schiefer, 

 exhibits here and there only the Primordial fossils discovered by Bar- 

 rande, and how from that Primordial zone the transition into the 

 overlying schists, with fossils of Llandeilo age, was to be best seen. 



And here I must do M. Lipoid and Dr. Fritsch the justice to say, 

 that, far from undervaluing the original and masterly labours of M. 

 Barrande, they had adopted all his formations, as base-lines, though 

 they had assigned local names to subformations, as synonyms of his 

 alphabetic classification. Thus, his lowest fossiliferous or Primordial 

 zone of C was their Przibram beds, and so on with all the overlying 

 divisions. As such, indeed, they appear in the accompanying map 

 of the Austrian Survey, and with their references to the stages of 

 Barrande. 



. I must also here state, that, before I left London, Mr. Salter had 

 come to the conclusion, from Bohemian fossils which he had ex- 

 amined, that the zone D' of Barrande, or the next division above the 

 Primordial (C), was a true equivalent of the Llandeilo beds. Again, 

 from a comparison of their fossils, M. Barrande had previously 

 properly compared other overlying beds of his great group D with 

 my Caradoc sandstone. In his great work he had, however, simply 

 divided, as I did in my first classification, the Silurian system into 

 upper and lower. 



In elaborating the British fossils of what was formerly called 

 Upper Caradoc, and particularly through the labours of Mr. Salter, it 

 was found, however, that an intermediate group ought to be esta- 

 blished, which I called Llandovery rocks, the lower member of which 

 had strong affinities with the Caradoc formation, whilst the upper 

 member was as clearly connected by its fossils with the Welsh strata. 



To the possible intercalation of the Llandovery rocks in the Bo- 

 hemian series of Barrande I will presently advert. 



I now beg to call attention to the Austrian Geological Map of the 

 Silurian basin of Bohemia, and of the subtending and overlying rocks, 

 by the Imperial Surveyors, which my old friend M. Haidinger, the 

 Director of that Survey, has transmitted to me. He has obligingly 

 attended to my request, and has had all the strata coloured on the 

 same principle which regulates the colouring of the Silurian rocks in 

 the British Survey. The only deviations from the base-colours of 

 dull and brighter grey and purple are where the Loess covers certain 

 lower tracts, or where the Upper Coal-strata are represented, as they 

 range unconformably over the Silurian rocks. 



In directing attention to the table of colours accompanying this 

 elaborate map, I must say that much closer analyses and compa- 

 risons of palaeontologists will be required before the subordinate 

 parts of the Bohemian series can be placed in such exact correlation 

 with our British local details as is here given. In fact, I do not 



