31G 
NATTTILOIDEA. 
tinctly mnbilicated, even when the shell is preserved.” The species, 
he adds, “is characterized by its lateral compression, the laterally 
strongly sinuous septa, and the external siphuncle.” A specimen of 
N. (H.) Trichinopolitensis was erroneously included by Blauford 
under his species N. rota^ on plate xxv. of the work quoted above ; 
this error was corrected by Stoliezka in his revision of the Nautili 
(p. 212 of the same work). 
Horizon. Arialur Group ( = Upper Chalk of England, Senonian of 
Erance). 
Locality. Arialur, Trichinopoly district, India. 
TEETIARY SPECIES. 
Nautilus centralis, J. Sowerby. 
1812. Nautilus centralis, J. Sowerby, Min. Conch, vol. i. p. 11, pi. i. 
(left-hand figure). 
1825. Nautilus Australis (by error for centralis), Defrance, Diet, des 
Sciences Naturelles, vol. xxxiv. p. 297. 
1836. Nautilus centralis, Wetherell, London, Edinburgh, and Dublin 
Phil. Mag. and Journ. Sci. vol. ix. p. 465. 
? 1840. Nautilus liucklandi' , Michelotti, ludice ragionato di alcuni 
Testacei de Cefal. foss. See., Ann. delle Scien. del Regno Lomb.- 
Veneto, p. 4. {Not of Sowerby.) 
? 1847. Nautilus Buchlandi, Michelotti, De.scrip. des Fossiles des 
Terrains Miocenes de ITtalie Septeutrionale, p. 348. 
1849. Nautilus centralis, Edwards, Mon. of the Eocene Cephalopoda 
and Univalves of England, vol. i. (Pal. Soc.), p. 45, pi. iii. ff. 1 a-c. 
1849. Nautilus centralis, Dixon, Geology and Fossils of the Tertiary 
and Cretaceous Formations of Sussex, pp. 110, 121, 228, pi. xiv. 
f. 28. 
1850. Nautilus centralis, d’Orbigny, Prodi'. de Pal(5ont. Stratigr. vol. ii. 
p. 338. 
1852. Nautilus imperialis (pars), Giebel, Fauna der Vorwelt, Band iii. 
Abth. i. p. 151. 
1854. Nautilus centralis, Morris, Cat. of British Fossils, 2nd ed. p. 306. 
1854. Nautilus centralis, Pictet, Traits de Pal^ontologie, 2nd ed. vol. ii. 
p. 629. 
1872. Nautilus centralis, Whitaker, Geology of the London Basin, 
Mem. Geol. Sm’v. of England and AVales, vol. iv.. Appendix, 
p. 589. 
1890. Nautilus centralis, Foord and G. C. Crick, Ann. Mag. Nat. 
Hist. ser. 6, vol. v. p. 391. 
Sp. Char. “ The Nautilus centralis in the simplicity of the septa 
^ This name was changed by d’Orbigny to Michelotti, JBucklandi being pre- 
occupied (Prodr. de Pal. Strat. vol. iii. 1852, p. 25). 
