ILLUSTRATIONS. 
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Tabular View of the component parts of the Lower 
Chalk north of the Thames Valley 
Comparative Vertical Sections of the Lower Chalk 
Ammonites \Acanihoceras\ rotomagensis , Brongn. (a, side 
view); (A, front view) - 
Turrilites costatus , Lam. - 
Turrilites Morrisi , Sharpe - 
Scaphites cequalis, Sow. 
Unicavdium ringmeriense , Mant. - 
Ammonites \Ha]doceras ] Austeni , Sharpe - 
Ammonites ySchloenbachia\ various , Sow. (a, side view) ; 
( b , front view) 
Actinocamax plenus, Blainv, - 
Avellana cassis , d’Orb. - - 
Solarium bicarinatum , Tiessen - 
Rhynchonella mantelliana , Sow. (a, front view); (A, side 
view) ------- 
Holaster subglobosus , Leske (a, apical view); (A, side 
view) ------- 
Discoidea cylindrical Lam. - 
Ilolaster trecensis , Leym. - 
lnoceramus latus , d’Orb. (non Mant.) 
Lima globosa, Sow. ------ 
„ aspera, Sow. • - 
Stauronema Carteri, Sollas - 
„ „ (spicular mesh, magnified) - 
Vermicularia umbonata , Sow. (a, under surface); (A, 
upper surface) 
View of the Chalk cliffs, near Folkestone • 
Section along the cliffs from Folkestone to Dovei - 
Section through the quarries near Burham- 
Section through the North Downs from Betchworth to 
near Ashstead - 
View of the top of the Lower Chalk at Beachy Head 
(from a photograph by the Rev. W. R. Andrews, F.G.S.) 
View of the Snowdown Quarry near Chard 
Sketch of a quarry by Combe Wood near Chard - 
Map of the country near Homton and Wilmington 
Sketch of a quarry at Wilmington - 
Diagram of the beds composing the zone of Ammonites 
Mantelli near Pinhay - 
View of Hooken cliff near Beer Head 
Sketch of a bluff in Branscombe cliffs 
Sketch in an old quarry on Kempstone Rocks, near 
Sidmouth ------ 
Section along the Vale of Broad Chalk 
Section across the Vale of Wardour 
Section from Broadtown to Hackpen Hill, Wiltshire 
Section through Chain Hill and Charlton, near Wantage - 
Section through Chilton in Berkshire 
Section through the Chalk-escarpment, near Risborough - 
The Belemnite Marl in a quarry at Butler’s Cross, 
Wenclover - - - 
Junction of Lower and Middle Chalk at Pitstone, 
near Tring - - - 
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