MOLLUSCA: LITERATURE. 437 



a Devonian form ; but true Ammonites have been found in 

 strata of Carboniferous age in India (Dr Waagen). The genus 

 Ceratites is characteristically Triassic, but it is said to occur in 

 the Devonian rocks. All the remaining genera are exclusively 

 Secondary, the genera BaculUes, Turrilites, Hamites, and Pty- 

 choceras being confined to the Cretaceous period. The only 

 genus which passes up into the Tertiary is Ammonites, which 

 occurs in beds believed to be of this age in America. 



Of the Dibranchiate Cephalopoda the record is less perfect, 

 as they have few structures which are capable of preservation. 

 They attain their maximum, as fossils, shortly after their first 

 appearance in the Secondary rocks, where they are represented 

 by the large and important family of the Beltmnitida. Some 

 of the Teuthida and Sepiadcz are found both in the Secondary 

 and in the Tertiary rocks, and two species of Argonaut have 

 been discovered in the later Tertiaries. No example of a 

 Dibranchiate Cephalopod is known from the Palaeozoic de- 

 posits, and the order attains its maximum at the present day. 



LITERATURE. 



GENERAL. 



i. "Manual of the Mollusca." S. P. "Woodward. 3d ed., with " Ap- 

 pendix of Recent and Fossil Conchological Discoveries," by Ralph 

 Tate. 1875. 



' Handbuch der Conchyliologie." Philippi. 1853. 



'Malacozoa." Bronn and Keferstein. In 'Bronn's Klassen und 

 Ordnungen des Thier-Reichs.' 1862-66. 



' Genera of Recent Mollusca." H. and A. Adams. 1853-58. 



'Catalogue of the Mollusca in the British Museum." J. E. Gray. 



' Figures of Molluscous Animals." Mrs Gray. 1874. 



' Manuel de Conchyliologie." Chenu. 1859. 



' Illustrations Conchyliologiques." Chenu. (Begun in 1843. ) 



' Thesaurus Conchyliorum." G. B. Sowerby. (Begun in 1842.) 



' Conchologia Iconica." Lovell Reeve. (Begun in 1841.) 



' Treatise on Malacology." Swainson. 1834. 



' Conchology." Swainson. 1840. 



' Memoires pour servir a 1'histoire et 1'anatomie des Mollusques. " 

 Cuvier. 1816. 



' History of British Mollusca." Forbes and Hanley. 



19- 



20. 



21. 

 22. 



23- 



2 4 . 



' Manual of British Conchology." Gwyn Jeffreys. 1862-69. 



' Traite elementaire de Conchyliologie. " Deshayes. 1839-59. 



' American Conchology." Say. 1830-32. 



' Synopsis of the Marine Invertebrates of Grand Manan." Stimpson. 



1851. 



' Invertebrata of Vineyard Sound." Smith and Verrill. 1874. 

 ' Mineral Conchology of Great Britain." J. Sowerby. 1812-30. 

 'Traite de Paleontologie." Pictet. 1853-57. 

 ' Cours elementaire de Paleontologie." D'Orbigny. 1849-52. 

 'Materiaux pour la Paleontologie Suisse." Pictet. (Begun in 1834.) 

 'Catalogue of British Fossils." Morris. 1854. 



