452 



Notices of Memoirs — British Association — 



in the ridges being increased proximally by intercalation, and in the 

 tubercles being squarely shaped and arranged iu a close series, even 

 in the proximal portion of the spine. 



Lepraeanthus rectus, sp. nov. — (a) Three ridges enlarged to show the ornamentation. 

 ih) Eidge seen from the lateral aspect. 



Type. — Author's collection. 



Form, and Loc. — Shale above the Better Bed Coal, Lower Coal- 

 measures, Low Moor, Yorks. 



Both Dr. Traquair and Mr. A. Smith Woodward have seen the 

 spine, and agree with me as to its specific distinction. 



D^OTZOIBS OIF DVCIE^vdZOIS-S- 



L — British Association for the Advancement of Science. 



Dover, 1899. 



Address to the Geological Section, by Sir Archibald 



Geikie, D.C.L., D.Sc, F.R.S., President of the Section. 



AMONG the many questions of great theoretical importance which 

 have engaged the attention of geologists, none has in late years 

 awakened more interest or aroused livelier controversy than that 

 which deals with Time as an element in geological history. The 

 various schools which have successively arisen — Cataclysmal, 

 Uniformitarian, and Evolutionist — have had each its own views as 

 to the duration of their chronology, as well as to the operations 

 of terrestrial energy. But though holding different opinions, they 

 did not make these differences matter of special controversy among 



