284 HISTORICAL PALEONTOLOGY. 



(23) ' Supplement to the Fossil Corals ' (Pal^ontographical Society). 



Martin Duncan. 



(24) ' Echinodermata of the Cretaceous Formation ' (Palaeontographical 



Society"). Wright. 



(25) 'Monograph of the Belemnitidae ' (Pal^ontographical Society). 



Phillips. 



(26) ' ^Monograph of the Trigonige ' (Palaeontographical Society). 



Lycett. 



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



(28) ' Fossil ]\Iollusca of the Chalk of Britain ' (Palaeontographical 



Society). Sharpe. 



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



Society). Rupert Jones. 



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



(Palaeontographical Society). Owen. 



(31) ' Manual of Paleontology.' 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.* 



^larsh. 



(35) ' Ossemens Fossiles.' Cuvier. 



(36) 'Catalogue of Omithosauria.' 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 Francaise.' Cotteau. 



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



(43) "Cephalopoda, Gasteropoda, Pelecypoda, Brachiopoda, Scc^ of the 



Cretaceous Rocks of India" — ' Palaontologica Indica,' ser. i., 

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



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



butions to Knowledge,' vol. xiv. Leidy. 



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



souri Countr}'.' 1876. Meek. 



CHAPTER XVIIL 



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 



