Vol. 54.] 



FAUNA OF THE SKIDDAW SLATES. 



539 



Species. 



Cell-characters, etc. 



No. of 



cells 



to inch. 



Incli- 

 nation. 



Aper- 

 tural 

 angle. 



Over- 

 lap. 



Tetragraptus Headi 



Bidymograptus patulus . . . 



^ Cells similar in 

 form, and in 



< contact for the 

 greater part of 



'^ their length. 



24 (9-10) 

 24 (9-10) 



40° 

 45° 



oblique 

 130° 



; 



In conclusion, I offer my grateful thanks to all who have helped 

 me in my work. 



I cannot sufficiently express my gratitude to Prof. Nicholson and 

 Mr. Postlethwaite for their generosity in placing their entire 

 collections at my disposal. Prof. Nicholson was also kind enough 

 to lend me specimens from the Quebec Group of Canada and 

 from the Arenig Beds of Australia for purposes of comparison. 



I wish also especially to thank Mr. Marr for the kind interest 

 which he has shown in my work, and for the great help which he 

 has given me throughout. 



My thanks are also due to Prof. Hughes and Dr. Henry Woodward 

 for permission to figure and describe the specimens in the Collections 

 of the Woodwardian Museum and the British Museum (Nat. Hist.) ; 

 to Mr. W. A. Brend for the loan of specimens ; and to Miss Y. S. Baker, 

 of Newnham College, for her valuable assistance in collecting in the 

 field. 



DiscFssiojsr. 



Mr. Maee said that he was pleased to find that the Authoress 

 was, in the main, in agreement with Prof. Nicholson and himself. 

 In matters of detail, he believed that she did not adopt their views, 

 but he felt that, after the careful manner in which she had studied 

 the fauna, the Authoress was more likely to be correct than previous 

 writers. He had originally intended to describe the fauna of the 

 Skiddaw Slates, but he felt that, after hearing the paper, the Fellows 

 would congratulate the Authoress, the speaker, and themselves that 

 the paper ha,d been written by Miss EUes. 



Dr. Hicks recognized that the classification of the Skiddaw Slates 

 adopted by the Authoress, on the strength chiefly of the graptolites, 

 agreed closely with that made out by him from stratigraphical and 

 palseontological evidence in the Lower Ordovician rocks of St. David's. 

 He thought that the paper was a very important one, and would be 

 of great assistance to those who were working on these rocks. 



The President and Prof. Watts also spoke. 



