Vlll EXPLANATION OF THE PLATES. 



Plates Pace 



^Pillar of Gypsum in Chellaston Alabaster^) 

 Quarries; and Microscope-Suctions of An- 

 hydrite AND GYPSUM FROM OoCKLAKES MlNE, 



XVII & XVIII <j illustrating Mr. B. Smith's paper on the )■ 174 

 Clielhiston Gypsum Breccia in its Relation 

 to the Gypsum - Anhydrite Deposits of 

 ^ Britain J 



(View of Caer Caradoc, showing Scarp and Dip^ 

 | Slopes; Exposure of Rhyn chonella Beds at j 

 Yjy f r yyJ Pentre Quarry ; and Geological Map of the I ^oi 

 ] Bucknell District, Shropshire, illustrating [ 

 Mr. L. D. Stamp's paper on the Highest J 

 ^ Silurian Rocks of the Clun- Forest District ...J 



( Liparoceras ; Androgynoceras and Mgoceras ; ^ 



Amblycoceras and Beaniceras-, Ficikinodi- j 



XXI-XXV<( ceras and Cymbites ; and Oisticeras, illus- )■ 247 



I t rating Dr. A. E. Trueman's paper on the | 



^ Evolution of the Liparoceratidre J 



