Ch. XXVL] 



UPPER DEVONIAN ROCKS. 



537 



disjunctus, Sow. (S. Vemeirilii, Murch.), (see fig. 601), found in 

 Europe, Asia Minor, and even China ; Spirifer Barriensis, S. Urii, and 

 Stroplialosia caperata, together with the large trilobite Phacops lati- 

 frons, Bronn. (see fig. 602), which is all but world-wide in its distribu- 

 tion. The fossils are numerous, and 80 per cent, of them are distinct 

 from those of even the Lower Carboniferous. 



Fig. 602. 



Fig. 601. 



Spirifer disjunctus, Sow. 

 Syn. Sp. Verneuilii, Murch. 

 Upper Devonian, Boulogne. 



Phacops latifrons, Bronn. 

 Characteristic of the Devonian in Eu- 

 rope, Asia, and N. and S. America. 



Petherwyn Group. — A series of limestones and slates best developed 

 at Petherwyn, in Cornwall. Among many other fossils, the Clymenia 

 linearis (fig. 603) and the minute crustacean, Cypridina serrato-striata 

 (fig. 604), are so characteristic of these upper beds in Belgium, the 



Fig. 604. 



Cypridina serrato-striata, Sand- 

 berger, Weilburg, &c, ; Nassau ; 

 Saxony; Belgium. 



Clymenia linearis, Munster. 

 Petherwyn, Cornwall ; Elbersreuth, Bavaria. 



Rhenish Provinces, the Hartz, Saxony, and Silesia, that strata of this 

 division in Germany are distinguished by the names of " Clymenien- 

 Kalk " and " Cypridinen-schiefer." * 



With these are many Goniatites (G. subsulcatus, Munster, and other 



See Murcliison's Siluria, 2d ed., chaps, x., xiv., and xv. 



