244 
NAUTILOTDEA. 
The largest specimen in the Collection (No. 88592) is 9 inches in 
its greatest diameter and 8 inches in its greatest width. 
The species nearest to the present one is the JS\ Bouchardinnus 
of d’Orbigny, but the latter is distinguished by being umbilicated, 
and the surface-markings are much more distinct than in N. suh- 
loivifjatus. 
Giebel^, finding that the name N. Icevigatus had been applied to 
a Clymenia by Miinster, changed it to X. cretaceus, overlooking the 
fact that d’Orbigny ^ had already substituted the name suhlievigatus 
for Icevigatus. 
Horizon. Lower Greensand. Lower Chalk. Upper Chalk. 
Loccdities. British. Faringdon, Berkshire (Lower Greensand), 
near Caine, Wiltshire (Chalk Marl) ; Pangbourn, Berkshire (Lower 
Chalk). — Foreign. Kouen, Seine Inferieure (Upper Greensand), 
Bourre, Loire-et-Cher ; France (Lower Chalk) ; Maestricht, Belgium ^ 
(Upper Chalk) ; Weisser Berg, Bohemia (Upper Cretaceous) ; Lem- 
berg, Galicia (Chalk) ; Pondicherry, India (Cretaceous). The 
specimen from Pangbourn, Berks (No. 88905), was presented by 
the Hon. Robert Marsham. 
Well represented in the C!ollcction. 
Nautilus undulatus, J. Sowerby. 
1813, Kemtilus undulatus, .7. Sowerby, Min. Couch, vol. i. p. 87, pi. xl. 
(upper figure). 
1830. Naidilus undulatus, Fitton, Trans. Geol. Soc. ser. ii. vol. iv. pt. ii. 
pp. 129, 307. 
1840. Xautilus undulatus, d’Orbigny, PaRontologie Fran9aise (Terrains 
Cretaces), vol. i. p. 93. 
1845. Xautilus undulatus, Forbes, Quart. Journ. Geol. Soe. vol. i. j 
p. 353. I 
1849. Nautilus undidatusy Quenstedt, Die Cephalopoden, p. 58. | 
1852. Xautilus undulatus, Giebel, Fauna der Vorwelt, Band iii. Abth. i. j 
p. 145. j 
1853. Xautilus undulatus, Sharpe, Description of the Fossil Remains j 
of Molliisca found in the Chalk of England (Mon. Pal. Soc.), pt. i. j 
Cephalopoda, p. 15", pi. v. ff. 4, a-c. I 
1854. Nautilus undulatus, Morris, Catalogue of British Fossils, 2nd ed. ! 
p. 307. ( 
1854. Nautilus Far ring donensis, Sharpe, Quart. Journ. Geol. Soc. vol. x. j 
p. 198, pi. vi. ff. la, lb. I 
^ Fauna der Vorwelt, Band iii. Abth. i. p. 140. 
^ Prodrome de Paleont. Stratigr. vol. ii. p. 189. 
^ The specimen from this locality is of somewhat doubtful determination. 
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