282 
NAUTILOIDEA. 
Localities. Ventnor, Isle of Wight (No. 36635); Warminster, 
Wiltshire (No. 24495). 
Represented in the Collection hy two examples. 
Nautilus expansus, J. de C. Sowerby. 
1822. Nautilus elegans (young state), Mantell, Fossils of the South 
Downs ; or Illustrations of the Geology of Sussex, p. 113, pi. xxi. 
f. 4. 
1824. Nautilus expansus, J. de C. Sowerby, Min. Conch, vol. v. p. 83, 
pi. cccclviii. f. 1. 
1835. Nautilus expansus, Mantell, Trans. Geol. Soc. ser. ii. vol. iii. 
pt. i. p. 209. 
1840. Nautilus Archiacianus, d’Orbigny, Pal(5ontologie Fran9aise (Ter- 
rains Cretac4s), p. 91, pi. xxi. 
1840. Nautilus expansus, d’Orbigny, ibid. p. 93. 
1850. Nautilus Archiacianus, d’Orbigny, Prodrome de Pal^ontologie 
Stratigraphique, vol. ii. p. 145. 
1850. Nautilus Archiacianus, Dixon, The Geology and Fossils of the 
Tertiary and Cretaceous Formations of Sussex, p. 358, pi. x.xix. 
f. 8. 
1852. Nautilus expansus, Giebel, Fauna der Vorwelt, Band iii. Abth. i. 
p. 148. 
1852. Nautilus Archiacianus, Giebel, ibid. p. 161. 
1853. Nautilus expayisus, Sharpe, Description of the Fossil Remains of 
MoUusca found in the Chalk of England, pt. i. Cephalopoda, Mon. 
Pal. Soc. p. 11, pi. ii. fE. 3 a, 3 h, 4 a-c, 5. 
1854. Nautilus expansus, Morris, Catalogue of British Fossils, 2nd ed. 
p. 306. 
1858. Nautilus expansus, Ooster, Catalogue des Cephalopodes Fossiles 
des Alpes Suisses, pt. iii. p. 13. 
1859. Nautilus expansus, Pictet et Campiche, Description des Fossiles 
du Terrain Cr4tac4 des Environs de Sainte-Croix (Paldontologie 
Suisse), sdr. ii. pt. i. p. 139. 
1876. Nautilus expansus, Schliiter, Palreontogi’aphica, Band xxiv. 
p. 173 (53). 
Sp. Char. “ Shell globose, with sloping, slightly flattened sides 
and a sharply-defined umbilicus ; surface elegantly marked hy fine 
sharp lines of growth, which are deeply incurved in front ; whorls 
increasing rapidly in size and nearly concealing the preceding 
whorls ; septa very flexuous ; siphuncle within the centre of the 
septum; mouth about as broad as high, somewhat pentangular, 
rounded in front, with nearly straight sloping sides deeply indented 
by the inner whorl, and with a deep, broad, rounded sinus. Dia- 
meter 2| inches, breadth 1| inch.'’ {Sharpe.) 
