Notices of Memoirs — Palaeozoic Rocks of Sweden. 273 



Explanation of Figvres. 



1. A specimen of B. hastata 4 mm. long, showing the loop viewed from the dorsal 



side. X 6. 



2. A specimen of B. hastata 10 mm. long, showing the loop looked at from the 



ventral side, x 4. 



3. The same specimen as that shown in Fig. 2 seen from the side. 



4. A specimen of B. hastata 15 mm. long, seen from the ventral side, x 2. 

 0. The specimen shown in Fig. 4 seen from the side. 



6. The loop of a specimen of B. elongata 6 mm. long, seen from the ventral side, x 4. 



7. The specimen shown in Fig. 6 seen from the side. 



nsroTiCES oif DVEE3ynoii?.s. 



On the Nomenclature of the Paleozoic Formations of Sweden. 



By J. C. MoBERG. 



[Translated from the Geologiska Foreningens i Stockholm Forhandlingar, 1908, 

 Band xxx, p. 343.] 



** "r\A.S TJebergangsgebirge " (Transition rocks), or the oldest but 

 \J one of the four main groups in Werner's geological scheme, 

 corresponded, as we know, to what we now call the ' Palaeozoic '. 

 By and by it was divided up into various systems or periods, but 

 long before that time AVerner's scheme had obtained a footing in 

 Sweden, and Swedish geologists, in referring to the Palaeozoic 

 formations of the country, used such terms as the Swedish equivalent 

 for ' Transition rocks ', ' formatio transitionis ', etc. Such was the 



DECADE T. VOL. VI. — NO. VI. 



