54 OUR COMMON BRITISH FOSSILS. 



(Monograptus) is there represented, but eight species 

 have been recognized as belonging to it. Of the 

 Cladophora there are several species of Dendrograptus 

 and Ptilograptus. The Wenlock shales are the home 

 of CyrtograptiiS) which may be found at Builth, and 

 in the Pentland Hills. 



At Key's End Hill, Malvern, and also near Port- 

 madoc, we find an abundance of another pretty fossil 

 coralline called Dictyonema sociale. In the Carbon- 

 iferous rocks we find Palceocoryne, and other probable 

 corallines. 



Graptolites must be sought for where the black 

 shales crop out, and these are usually amid the 

 grandest or the prettiest and loveliest bits of river, 

 hill, and mountain scenery. Nature holds forth charms 

 of her own to tempt the geological student from the 

 busy haunts of men to the quietest parts of her sanc- 

 tuary, where she deigns to unfold the mysteries that 

 were originally hidden for him when "the foundations 

 of the earth were laid." 



