ROCKS OF BOHEMIA. 619 



another part of the series in the same district with a different group 

 in the intermediate beds was, in his experience, very rare. The 

 only case at all like it that he knew was on the borders of York- 

 shire, where a group of fossils occurred in a band low down in the 

 Coniston Grit; and though the species were all found here and 

 there scattered through the series, the group was only seen again in 

 that area 7000 feet higher in the series. But this was quite a 

 different case from that of the colonies now put before them, and 

 he thought the recurrence three times of the three zones in the 

 same order a coincidence too remarkable to be received without the 

 clearest stratigraphical evidence. 



Prof. JuDD said he had some years ago had the opportunity of 

 examining the district, and he thought the conclusion could not be 

 avoided that M. Barrande had been more successful in the palaeon- 

 tological branch of his work than in the stratigraphical. In the 

 former he was quite unrivalled ; but in the field he appeared, during 

 recent years, to have trusted more to others than himself. It was 

 obvious on examination that the beds were much disturbed and 

 required much careful mapping. 



Dr. Hicks expressed his high appreciation of the paper. He felt 

 quite convinced by the author s reasoning. The author had not only 

 given him all the beds he had at St. Davids of Cambrian and Silu- 

 rian age, but Pre-Cambrian also. He fully believed that the 

 colonies were only repetitions by folds and faults. 



Kev. J. F. Blake said that in studying Silurian Cephalopoda the 

 colonies proved a great trouble because we did not find Lower 

 Silurian forms associated with Upper Silurian. The Cephalopoda in 

 the colonies, not found in the Lower Silurian, are more allied to the 

 English Upper Silurian. 



Mr. Maee said that he was much gratified by the way in which 

 his paper had been received. A case which had been mentioned as 

 somewhat parallel in the Lake district was hardly so, as the suj?- 

 posed Ludlow fossils were also Wenlock. M. Barrande, of late 

 years, had had his attention diverted from the Graptolites, and so 

 had not been able to make use of Mr. Lapworth's researches. 



