NATJTILID^. 
283 
Remarhs. Sharpe observes that “ the figure in the ‘ Mineral Con- 
chology ’ is taken from a specimen somewhat expanded at the mouth 
by pressure ; but the form of the umbilicus and the fine sharp 
striae leave no doubt of its identity with N. Archiacianus, d’Orbigny.” 
This species is very near to N. Reslongchampsiamis, d’Orbigny, in 
its general form, and especially in the sharply angular border of the 
umbilicus, but the sculpture of the test serves at once to distinguish 
it. Whereas in N. expansus the test is marked, only by fine striae, 
in N. DesJongchampsianus there are strong transverse ribs, and 
between these a series of little continuous grooves running longi- 
tudinally, and forming crenulations in crossing the ribs. N. expansus 
is also flatter upon the periphery than N. Dcslongchampsianus. 
Horizon. Upper Greensand. Lower Chalk. 
Localities. British. Warminster, Wiltshire (Upper Greensand) : 
Ventnor, Isle of Wight ; Sussex ; Chardstock, Somersetshire (Lower 
Chalk) : Ventnor (Chloritic Marl) : Chard, Somersetshire ; Wiltshire ; 
Dover, Kent ; Hamsey, Sussex — Sowerby’s type (Chalk Marl). — 
Foreign. Itouen (Seine-Inferieure), France (Upper Greensand); 
Meglisalp (Sentis), Appenzell, Switzerland (Cretaceous). 
W'ell represented in the Collection, which contains J. deC. Sowerby’s 
type specimen (Xo. 43849), figured in the ‘Mineral Conchology;’ 
also the specimens figured in Mantell's ‘ Fossils of the South Downs,’ 
and Dixon’s ‘ Geology of Sussex.’ One specimen (Xo. C. 2187) was 
presented by P. E. Combe, Esq. 
Nautilus Iiargilliertianus, d’Orbigny. 
1840. Nautilus Largilliertianus, d’Orbigny, Pal^ontologie Fran 9 aise 
(Terrains Cretacds), vol. i. p. 86, pi. xviii. 
1842. Nautilus Largilliertianus, Matlieron, Cat. M(5th. et Descrip, des 
Fossiles dll Departement dii Bouches-dii-Rhone et Lieux Circon- 
voisins, p. 259. 
1850. Nautilus Largilliertianus, d’Orbigny, Prodrome de Pal^ontologie 
Stratigraphique, vol. ii. p. 145. 
1852. Nautilus Largilliertianus, Giebel, Fauna der Vorwelt, Band iii. 
Abth. i. p. 160. 
1853. Nautilus Largilliertianus, Sharpe, Description of the Fossil 
Remains of Mollusca found in the Chalk of England, pt. i. Cepha- 
lopoda, Mon. Pal. Soc. p. 16, pi. vi. ff. 1 a, 1 2 «, 2 b. 
1854. Nautilus Largilliertianus, Morris, Catalogue of British Fossils, 
2nd ed. p. 307. 
1861. Nautilus Largillierii, Reynes, fitudes sur le Synchronisme et la 
Delimitation des Terr. Cretaces du Sud-Est de la France, p. 34. 
1862. Nautilus Largilliertianus, Bristow and Etheridge, Mem. Geol. 
Surv. of Great Britain— Geology of the Isle of Wight (Sheet x.), 
p. 137. 
