Distribution of the Rhabdophora. 59 



&c, where I have procured fragments of Cyrtograptus Mur- 

 chisoni. 



Lake District. — Throughout the Westmoreland region the 

 zone of C. Murchisoni seems to overlie the Pale Slates proper, 

 and to form the base of the Coniston series. From the lowest 

 beds of the Coniston Flags near Broughton have been col- 

 lected, either by Prof. Nicholson or myself*, 



Cyrtograptus Murchisoni, Carr. Monograptua riccartonenaia ?, 



Monograptua priodon, Bronn, Lapw. 



Halli, Burr. colonus, Barr. 



vomerinus, Nich. Retiolites Geinitzianus, Barr. 



Sweden. — The same zone has been detected by Mr. G. 

 Linnarsson at the base of the Betiolites-heds of Scania. 

 From this zone at Rostanga Herr v. Schmalensee has col- 

 lected | 



Cyrtograptus Murchisoni, Carr. Monograptus vomerinus, Nich. 



Monograptus priodon, Bronn. Retiolites Geinitzianus, Bai-r. 



The same zone is recognizable in many other localities, 

 always affording its characteristic fossils. 



Bohemia. — Mr. Carruthers J recognized Cyrtograptus Mur- 

 chisoni in a collection of Graptolites forwarded by Barrande 

 to the British Museum, London. Its true horizon in Bohemia 

 is unknown. 



(b) Higher Wenlock Strata. 



Wales. — In the main mass of the Wenlock Shales, Grapto- 

 lites are rarer than in the Murchisoni zone. Locally, how- 

 ever, they are abundant. From the Wenlock Shales, near 

 Builth-Road Station, Radnorshire, I have collected 



Cyrtograptus Linnarssoni, Lapiv. Monograptus Halli, Barr. 

 Monograptus colonus, Barr. vomerinus, Nich. 



The same forms occur in the Wenlock Shales of the valley 

 of the Onny, above Horderly, the first named in fragments 

 only. 



Lake District. — In the higher Coniston Flags of the Lake 

 District I have myself collected 



Retiolites Geinitzianus, Barr. Monograptus vomerinus, Nich. 

 Monograptus priodon, Bronn. colonus, Barr. 



* Profesaor Hughes enumerates also Monograptus Flemingii, Salt., and 

 Monoqraptus latus, M'Coy, from these beds (Mem. Geol. Survey England 

 and Wales, Explan. Sheet 98, S.E., p. 11). 



t Linnarsson, Obs. Grapt. Schists of Scania (Geol. Foren. Forhandl. 

 1879, p. 256). 



} Carruthers, Geol. Magazine, vol. v. p. 128. 



