284 HISTORICAL PAL/EONTOLOGY. 



(23) ' Supplement to the Fossil Corals ' (Palaeontographical Society). 



Martin Duncan. 



(24) ' Echinodermata of the Cretaceous Formation' (P^ikeontographical 



Society). Wright. 



(25) 'Monograph of the I'elemnitidze ' (Palseontographical Society). 



Phillips. 



(26) 'Monograph of the Trigonise' (Palaeontographical Society). 



Lycett. 



(27) ' Fossil Cirripedes ' (Palneontdgraphical Society). Darwin. 



(28) ' Fossil Mollusca of the Chalk of Britain ' (Palaeomographical 



Society). Sharpe. 



(29) ' Entomostraca of the Cretaceous Formation ' (Palseontographical 



Society). Rupert Jones. 



(30) 'Monograph of the Fossil Reptiles of the Cretaceous Formation' 



(Palaeontographical Society). Owen. 



(31) ' Manual of Palaeontology. ' 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.' 



Marsh. 



(35) 'Ossemens Fossiles.' Cuvier. 



(36) 'Catalogue of Ornithosauria.' Seeley. 



(37) ' Paleontologie Francaise. * D'Orbigny. 



(38) ' Synopsis des Echinides fossiles.' Desor. 



(39) 'Cat. Raisonne des Echinides.' Agassiz and Desor. 



(40) "Echinoids" ' Decades of the Geol. Survey of Britain.' E. Forbes. 



(41) 'Paleontologie Fransaise.' Cotteau. 



(42) ' Versteinerungen der Bohmischen Kreide-formation.' Reuss. 



(43) "Cephalopoda, Gasteropoda, Pelecypoda, Brachiopoda, &c., of the 



Cretaceous Rocks of India" ' Paloeontologica Indica,' ser. i., 

 iii., v., vi., viii. Stoliczka. 



(44) "Cretaceous Reptiles of the United States" 'Smithsonian Contri- 



butions to Knowledge,' vol. xiv. L^idy. 



(45) ' Invertebrate Cretaceous, and Tertiary Fossils of the Upper Mis- 



souri Country.' 1876. Meek. 



CHAPTER XVIII. 

 'THE EOCENE PERIOD. 



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 



