No remains of _Mammals_, finally, have as yet been detected in any sedimentary accumulations of Cretaceous age. LITERATURE. The following list comprises some of the more important works and memoirs which may be consulted with reference to the Cretaceous strata and their fossil contents:-- (1) 'Memoirs of the Geological Survey of Great Britain.' (2) 'Geology of England and Wales.' Conybeare and Phillips. (3) 'Geology of Yorkshire,' vol. ii. Phillips. (4) 'Geology of Oxford and the Thames Valley.' Phillips. (5) 'Geological Excursions through the Isle of Wight.' Mantell. (6) 'Geology of Sussex.' Mantell. (7) 'Report on Londonderry,' &c. Portlock. (8) 'Recherches sur le Terrain Crétacé Supérieur de l'Angleterre et de l'Irlande.' Barrois. (9) "Geological Survey of Canada"--'Report of Progress, 1872-73.' (10) 'Geological Survey of California.' Whitney. (11) 'Geological Survey of Montana, Idaho, Wyoming, and Utah.' Hayden and Meek. (12) 'Report on Geology,' &c. (British North American Boundary Commission). G. M. Dawson. (13) 'Manual of Geology.' Dana. (14) 'Lethæa Rossica.' Eichwald. (15) 'Petrefacta Germaniæ.' Goldfuss. (16) 'Fossils of the South Downs.' Mantell. (17) 'Medals of Creation.' Mantell. (18) 'Mineral Conchology.' Sowerby. (19) 'Lethæa Geognostica.' Bronn. (20) 'Malacostracous Crustacea of the British Cretaceous Formation' (Palæontographical Society). Bell. (21) 'Brachiopoda of the Cretaceous Formation' (Palæontographical Society). Davidson. (22) 'Corals of the Cretaceous Formation' (Palæontographical Society). Milne-Edwards and Haime. (23) 'Supplement to the Fossil Corals' (Palæontographical Society). Martin Duncan. (24) 'Echinodermata or the Cretaceous Formation' (Palæontographical Society). Wright. (25) 'Monograph of the Belemnitidæ' (Palæontographical Society). Phillips. (26) 'Monograph of the Trigoniæ' (Palæontographical Society). Lycett. (27) 'Fossil Cirripedes' (Palæontographical Society). Darwin. (28) 'Fossil Mollusca of the Chalk of Britain' (Palæontographical Society). Sharpe. (29) 'Entomostraca of the Cretaceous Formation' (Palæontographical Society). Rupert Jones. (30) 'Monograph of the Fossil Reptiles of the Cretaceous Formation' (Palæontographical Society). Owen. (31) 'Manual of Palæontology.' 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) 'Paléontologie Française.' D'Orbigny. (38) 'Synopsis des Echinides fossiles.' Desor. (39) 'Cat. Raisonné des Echinides.' Agassiz and Desor. (40) "Echinoids"--'Decades of the Geol. Survey of Britain.' E. Forbes. (41) 'Paléontologie Française.' Cotteau. (42) 'Versteinerungen der Böhmischen Kreide-formation.' Reuss.