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( (Palzeontographical Society). Owen. 
(31) ‘Manual of Palzontology.’ Owen. 
(32) ‘Synopsis of Extinct Batrachia and Reptilia.’ Cope. 
(33) ‘Structure of the Skull and Limbs in Mosasauroid Reptiles ””— 
‘American Journ. Sci. and Arts, 1872.’ Marsh. 
(34) ‘*On Odontornithes ”—‘ American Journ. Sci. and Arts, 1875.’ 
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(35) ‘Ossemens Fossiles.” Cuvier. 
(36) ‘Catalogue of Ornithosauria.’ Seeley. 
(37) ‘ Paléontologie Frangaise.’ D’Orbigny. 
(38) ‘Synopsis des Echinides fossiles.’ Desor. 
(39) ‘Cat. Raisonné des Echinides.’ Agassiz and Desor. 
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(42) ‘ Versteinerungen der Bohmischen Kreide-formation.’ Reuss. 
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Cretaceous Rocks of India”—‘ Paleontologica Indica,’ ser. i., 
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4q)i= Cretaceous Reptiles of the United States” —‘ Smithsonian Contri- 
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souri Country.’ 1876. Meek. 
— 
CYLAP AE Re 2cV Gli; 
Tie OCP NE  PERIOP, 
Before commencing the study of the subdivisions of the 
Kainozoic series, there are some general considerations to be 
noted. In the first place, there is in the Old World a com- 
plete and entire physical break between the rocks of the 
Mesozoic and Kainozoic periods. In no instance in Europe 
are Tertiary strata to be found resting conformably upon any 
Secondary rock. The Chalk has invariably suffered much 
erosion and denudation before the lowest Tertiary strata were 
deposited upon it. This is shown by the fact that the actually 
