Swedish and British GraptoUtic Deposits. ' 247 



graptus priodon, Bron., and BetioUtes Geinitzianus, Barr. The same 

 species characterize the true Upper Silurian Eocks of the north of 

 England (Coniston Flags and Grits), the Upper Silurian Eocks of 

 the South of Scotland, and the same deposits in Wales. It seems 

 tolerably certain, however, that the highest beds of Dr. Linnarsson's 

 " Upper Graptolitic Schists" are truly referable to this fifth zone, and 

 are, therefore, of Upper Silurian age. This seems to be proved by 

 the fact that the beds in question are not only lithologically different 

 from the lower portion of the " Upper Graptolitic Schists," but 

 contain Monograptus priodon, Bron., If. vomeriims, Nich., and Be- 

 tioUtes Geinitzianus, Barr., all of which are characteristic Upper 

 Silurian species in Britain. 



It may be as well to give here a list of the Graptolites comprised 

 in the collection kindly sent me by Dr. Linnarsson, and in so doing, 

 I have thought it best in all cases to adhere to the names given by 

 Dr. Linnarsson himself : — 



I. Olenus Schists. (Bed No. 12 of List, see p. 245.) 

 1. Dichograptus tenellus, Linnarsson ; Westrogothia. 



II. DiCTYONBMA ScHisTS. (Bed No. 11 of List.) 



1. Dicty onema flahelUforme, 'Eichw.; Scania and Ostrogothia. 



2. Dichograptus sp. ; Scania. 



III. Lower Graptolitic Schists. (Bed No. 9 of List.) 



1. Phyllograptus angustifoUus, Hall ; Scania and Westrogothia. 



2. — typus, Hall ; Scania. 



3. Didi/mograpfus hirundo, Salt. ; Scania and Westrogothia. 



4. striatulus, Linnarsson (MS.) ; Westrogothia. 



5. sp. (Comp. D. V-fractus, Salt.) ; Scania. 



6. Tetragraptus hryonoides, Hall ; Westrogothia. 



IV. Middle Graptolitic Schists. (Bed No. 7 of List.) 



1. Dicranograptus Clingani, Carr. ; Scania. 



2. Dicellograptus sp. ; Scania. 



3. Climacograptus teretiuscidus, His. ; Scania. 



4. Diplograpsus pristis, His. ; Scania. 



V. Trinucleus Schists. (Bed No. 5 of List.) 



1. Diplograptus pristis, His.; Dalecarlia, and Ostrogothia. 



2. Dicellograptus elegans, Carr. (?) ; Dalecarlia. 



YI. Upper Graptolitic Schists. (Bed No. 3 of List.) 



1. BetioUtes Geinitzianus, Barr. ; Ostrogothia, and Dalecarlia. 



2. Bastrites peregrinus, Barr. ; Scania, and Dalecarlia. 



3. GraptoUthus priodon, Bronn. ; Ostrogothia, and Dalecarlia. 



4. • Sagittarius, His. ; Westrogothia, and Ostrogothia. 



5. lohiferus, McCoy ; Dalecarlia. 



6. convolutus, His. ; Dalecarlia. 



7. turriculatus, Barr. ; Ostrogothia. 



8. proteus, Barr. (?) ; Dalecarlia. 



9. teretiusculus, His. (=zscalaris, His.) ; Westrogothia. 



It may not be out of place if I conclude these notes with a brief 

 diagnosis of four generic types which I formerly placed in Dicho- 

 graptus, but which I am now disposed to place in distinct groups : — 



