XAUTITJD^. 
243 
1872. Xaufilus snh1<pi'igatus, Frit'sch, Cephalopodeii der bdbmischeii 
Kreideformation, p. 21, Taf. xii. f, 1. 
1872. Nautilus suhlcerigatus, Geinitz, Palaeontograpliica, Band xx, 
pt. ii., Das Elbthalgebirge in Sachsen, pt. ii.,” p. 182, Taf. xxxii. 
ff. 1, 1 a, and 3. 
1876. Nautilus l<Bvigatus, Barrois, Mem. de la Societe Geologique du 
Xord, vol, i. p. 107. 
1879. Nautilus Icevigatus, Ubaghs, Description Geologique et Paleon- 
tologique du Limboiirg, p. 201. 
1881. Nautilus Icemgatus^ Mourlou, Geologic de la Belgique, vol. ii. p. 101. 
[JVb/! 1846. Nautilus l<BvigatuSj Forbes, Tmns. Geol. Soc. ser. ii. vol. vii. 
p. 97.] 
Sp. Char. “ Shell globose, smooth, with the hack and sides uni- 
formly rounded, and a very faint line running along the middle of 
tlie back ; umbilicus very small and entirely concealed in the inner 
whorls ; septa slightly arched, with nearly straight margins ; 
siphuncle a little in front of the centre ; mouth nearly semicircular, 
but rather wider than high, deeply indented by the preceding whorl, 
with a broad, shallow, median sinus. 
“ N. suhlcpvigatus is one of the commonest of the Cretaceous 
species, and is found throughout the whole range of the Chalk, viz. 
in the Upper Chalk near Brighton ; in the Middle Chalk near Maid- 
stone, Hemel Hempstead, and Tring ; in the Grey Chalk at Dover 
and Lewes ; in the Chloritic Marl of Bonchurch in the Isle of Wight ; 
and in the Chalk with siliceous grains at Chardstock and on the 
coast of Dorsetshire.” {Sharpe.) 
liemarTcs. This species, like N. pUcatas, is remarkably inflated ; 
it is known only by casts, which exhibit no traces of shell-ornaments. 
The umbilicus is closed ; the septa are rather distant ; the siphuncle 
is nearly central, or a little above the centre. The typical locality 
of this species in England is Faringdon (or Farringdon), Berkshire 
where it occurs in a coarse quartzose gravel, “ mostly hardened by 
a ferruginous cement”’. N. sublcevir/ahis has been identified at 
v.arious places on the Continent : in France (its typical locality), 
Holland, and Bohemia. Its identification, however, in the latter 
country is difficult, as the specimens are frequently crushed, and 
they have thus a compressed appearance, very different from the 
inflated form of the species in its normal condition. A variet}" of 
si^hlcBvigatus was described by Stoliczka ^ from the Cretaceous rocks 
of Southern India. 
^ See H. B. Woodward’s ‘ Geology of England and Wales,’ 2nd ed. 1887, 
p. 375. 
Mem. Geol. Surv. India — Palseont. Indica, 1866, pp. 203, 204, pi. v. IF. 1,3. 
R 2 
