246 
>’AUTILOIDEA. 
lines of growth. The Hythc specimen (No. 62160) is the largest 
ill the Collection, and measures 8 inehes in its greatest diameter. 
A specimen from the Neocomian of Ncuchatel, 8witzerland, though 
a badly preserved cast, shows traces of the undulations, and may 
probably also be referred to the present species. 
Nautilus Fainngdonensls of Sharpe must be regarded as a synonym 
of the present species, the differences relied upon by Sharpe to 
separate his species from Nautilus undulatus being easily explained 
by the state of preservation of the former. The strong peripheral 
folds characteristic of umlulatm are quite distinct ujion a specimen 
from Faringdon in the British Museum. These folds being less 
prominent in Sharpe’s specimen, may have led him to suppose that 
it had “ fainter undulations than N. mulidatusF Sharpe also 
claims for his species a larger umbilicus than Sowerby’s : but on 
comparing several specimens of undulatus with the Faringdon fossil 
this alleged distinctive character also breaks down. 
Schafhaiitl figures a very imperfect specimen under the name 
Nautilus undulatus^ but the reference seems very doubtful. 
Horizon. Lower Greensand. Upper Greensand ? 
Localities. British. Hythe, Lympne, Kent ; Faringdon, Berk- 
shire ; Devizes, Wiltshire. — Foreiyn. Escragnolles, Lji Martrc ( Var) ; 
France (Lower Neocomian) ; Ncuchatel, Switzerland. 
Of the other specimens contained in the Collection the localities 
are wanting, but they are doubtless British, and on the whole the 
species is very well represented. 
Nautilns plicatus, Fitton. 
1802. Nautilite hrode, Montfort, in his edi6ou of Sonnini’s “ Suite ji 
Biidbu ” (Hist. Nat. des Mollusques, An. x.), vol. iv. p. 255, 
pi. xlviii. f. 2. 
1835. Nautilus plicatus, Fitton, Trans. Geol. Soc. ser. ii. vol. iv. pt. ii. 
p. 129 (with woodcut), pp. 349 and 367. 
1840. Nautilus Requienianus, d’Orbigny, Paleontologie Frau 9 aise (Ter- 
rains Cretaces), vol. i. p. 72, pi. x. 
1841. Nautilus plicatus, Leymerie, Mem. Soc. Geol. de France, vol. iv. 
pt. ii. p. 342. 
1841. Nautilus Requienianus^ Leymerie, ibid. p. 342. 
1842. Merkwiirdige Versteinerung, Glocker, Nov. Acta Acad. Leop.- 
Carolin. Nat. Cur. vol. xix. pt. ii. p. 696, tab. Ixix. ff. 1, 2. 
1845. Nautilus plicatus, Forbes, Quart. Journ. Geol. Soc. vol. i. p. 353. 
1847. Nautilus Requienianus, Pictet and Roux, Descriptions des Mol- 
kisques Fossiles des Gi es Verts des Environs de Geneve, p. 14. 
1847. Nautilus plicatus, Pictet and Roux, ibid. p. 14. 
1849. Nautilus Requienianus, Quenstedt, Die Cephalopoden, p. 58. 
