vill List of Illustrations in the Text. 
Four types of ridge-curves in ‘ Dreikante ’ 
Diagram of formation of curved-faced ‘ Dreikante ’ 
Five-faced wind-worn pebble 
Block of sandstone pierced by numerous borings from the Fayim, Egypt 
Section of Bagshot Beds, Shooters Hill, Kent 
Pygidium of Brontews Halli, sp. nov., Devonian, Gerolstein . 
B. thysanopeltis, Barr. (two figures), Upper Silurian, Bohemia 
B. speciosus, Corda, Devonian 
Section of Creechbarrow Limestone and underlying series 
Two figures of flint pebble, showing included organism . 
Section of shell of Ostrea cornucopie 
Two figures of Radiolites Mortoni 
Six figures of Pollicipes imbricatus, Withers, sp. noy. 
Three figures of P. unguis, J. de C. Sby. 
Section from Shooters Hill to Bostall Common 
