244 Br. G. Linnarsson — Vertical Range of GraptoUtes in Sweden. 



usually redclisli, and more marly or calcareous, Graptolites are 

 almost totally wanting. 



From the Brachiopod Schists no Graptolites are known. 



In the Upper Graptolitic Schists they are on the contrary abundant. 

 The general character of their Graptolitic fauna is quite different 

 from that of the older ones. All branched forms, such as Didymo- 

 graptus, Dicranograptus, etc., seem here to be wanting. Of diprio- 

 nidian forms Diplograptus and Climacograptus still occur, and to 

 them is added Betiolites, a genus which has been found in the under- 

 lying rocks. The unbranched monoprionidian forms appear in this 

 horizon in great plenty. Of the genus Graptolitlius numerous 

 species occur, and Bastrites is represented at least by two or three. 

 The Upper Graptolitic Schists occur also in the Isle of Bornholm, 

 but are not known from Norway. In Bohemia and Britain thej^ 

 have also very well-marked analogues. The lower portion of 

 Barrande's Stage E and the ''colonies" in his Stage D contain a 

 quite corresponding fauna. Among the species common to the 

 Bohemian and Swedish beds are Graptolithus priodon, lohiferus, 

 and colonus, Diplograptus palmeus, Bastrites peregrinus, Betiolites 

 Geinitzianus, and several others. In Great Britain, the Coniston and 

 Gala beds correspond to the Upper Graptolitic Schists of Sweden. 



The Upper Graptolitic Schists occur in Westrogothia, Ostrogothia, 

 Scania, and Dalecarlia. In the two first-named provinces they are 

 the youngest Silurian rocks. In Scania they seem to be imme- 

 diately overlain by Upper Silurian beds, corresponding to the lowest 

 beds of Gotland. In Dalecarlia they are overlain by a limestone 

 peculiar to that province, the Leptcena Limestone of Tornquist, or the 

 tjqDical part of Begio Harparum of Angelin.^ In that limestone no 

 traces of Graptolites have been found. 



In the Upper Silurian rocks of Sweden, which form the Begio 

 Encrinworum of Angelin, and which I have therefore termed 

 Encrinurus Beds, Graptolites are nearly entirely wanting. From 

 Gotland Dr. Lindstrom mentions in his enumeration of the fossils of 

 that island only a " Graptolites sp." The only fragments I have 

 myself seen are so obscure as not to enable me to determine their 

 generic characters. In the UjDper Silurian of Jemtland and Scania 

 I have not found any Graptolites at all. The scarcity of the Grap- 

 tolites in our Upper Silurian is no doubt in a large part due to the 

 nature of the sediment. In Norway, where schistose beds occur in 

 the higher parts of the Upper Silurian, some species of Graptolites 

 are found plentifully in Stage 8 of Kjerulf, which belongs to the 

 Ludlow formation according to the English classification. The 

 species cited by Kjerulf from that horizon are Graptolithus Ludensis 

 and Betiolites Geinitzianus. The former might j^ossibly, judging 

 from the figures, include also a Cyrtograptus. 



The subjoined list will show our present knowledge of the 



^ Angelin has erroneously, though with some hesitation, parallelized the Zeptcsna 

 Limestone of Dalecarlia with the Brachiopod Schists of Westrogothia and Ostro- 

 gothia, and therefore included also the latter in his liegio Harparum. 



