50 



not a more recent formation. The real difficulty of the case arises 

 from the fact that geologists have hitherto been unable to ascertain 

 the character of the rocks upon which the Skiddaw Slates rest ; 

 and so long as that question remains unsolved, the only reliable 

 evidence available for determining their true position, is that 

 afforded by the fossilized remains of life they contain. And it 

 will scarcely be necessary to inform my readers, that the more 

 extensive and perfect the assemblage of fossils, the more conclusive 

 will be the evidence to be derived therefrom. 



LIST OF GRAPTOLITES FROM THE SKIDDAW SLATES. 



Azygograptus lapivorthi. Nich. 



DidymograpHis nitidtis. Hall. 



D. patulus. Hall. 



D. extensus. Hall. 



Z>. gibberuhts. Nich. 



D. bifidis. Hall. 



D. affinis. Nich. 



D. fasciculatus. Nich. 



D. geminus. His. 



D. serratulus. Hall. 



D, v-fracUts. Salt. 



D. sextans. Hall. 



Z>. divaricaUts. Hall. 



Tetragraptiis bryonides. Hall. 



T. headi. Hall. 



T, cnici/er. Hall. 



T, quadribrachiatus. Hall. 



Dichograptus octobrackiattis. Hall. 



D. reticulatus. Nich. 



D. multiplex. Nich. 



Dichograptus gracilis. Nich. 



D, annulatits^. Nich. 



Loganograptus logani. Hall. 



Plairograpttts vagans. Nich. 



Graptolites tenuis. Portl. 



Diplograptus pristiniforniis. Hall. 



D. pristis. His. 



D. hopkinsoni. Nich. 



D. armatus. Nich. 



D. mucro7tatus. Hall. 



Climacograptus antennarius. Hall, 



C. bicornis. Hall, 



C. teretiusculus. Hall. 



Trigonograptus lanceolatus. Nich. 



Phvllograptus typus. Hall. 



P. angusti/o'ius. Hall, 



P. anna. Hall. 



Dendrograptus hallianus, Prout. 



Thamnograptus doveri. Nich. 



LIST OF LOCALITIES WHERE GRAPTOLITES HAVE BEEN 

 FOUND IN THE SKIDDAW SLATES. 



Randel Crag, N. W. of Skiddaw Summit. Bleeze Gill, Blencathra. 

 Gibraltar Crag, do. do. Bannerdale Fell. 



Sand Beds, Bassenthwaite, Barf, Thornthwaite. 



