298 
NAUTILOIDEA. 
following measurements : — Greatest diameter 10 inches ; greatest 
breadth about 7 inches. It is completely silicified. 
In the ‘ Prodr. de Paleont. Stratigr.’ (vol. ii. 1850, p. 290) 
d’Orbigny described a species under the name of yauiilus Heberti- 
niis, but the description has not been deemed sufficient by Favre * 
to establish the species. So far as it goes it agrees very well with 
Binkhorst’s species. D’Orbigny’s description runs thus : — “ Grande 
espece globuleuse, tres-convexe, lisse, a ombilic tres-etroit (dans le 
moule) ; cloisons peu arquees, non sinueuses, a siphon place bien 
plus pres du retour de la spire que du bord externe. France, Mon- 
tereau (Seine-et-Marne), la Falaise, Montainville, pres de Beynes 
(Seine-et-Oise).” 
Binkhorst seems to have overlooked d’Orbigny’s species ; he, at 
least, makes no mention of it. It is singular that he should have 
dedicated his species to the same individual, M. Hebert, as d'Orbigny 
had already done. 
A very good, though foreshortened, figure of a XautiJus, which, 
judging by the position of the siphuncle &c., most probably belongs 
to the present species, was given by Faujas dc Saint-Fond in the 
work quoted at the beginning of this description. Faujas’s specimen, 
it will be observed, was in the same mineral condition as the 
specimen belonging to the British Museum, described above, and 
both are doubtless derived from the same beds. 
Horizon. Upper Chalk. 
Locality. Maestricht^ (Limburg), Belgium. 
Nautilus sphaericuS) Forbes. 
1846. Nautilus sphesricus, Forbes, Trans. Geol. Soc. ser. ii. vol. vii. 
pt. iii. p. 98 (outline figure). 
1861. Nautilus Bouchardianus (pars), Blanford, Mem. Geol. Surv. India — 
Palaeont. Indica — i. Cret. Ceph. of Southern India, p. 13. 
1866. Nautilus sphcericuSy Stoliezka, ibid. p. 203, pi. xcii. ff. 3, 3 a. 
1877. Nautilus spheericus, Meek, Eeport L’nited States Geol. Surv. of 
the Territories, vol. ix. Invert. Cretaceous and Tertiary Fossils of 
the Upper Missouri, p. 497. 
1879. Nautilus spheericus, H..B. Medlicott and W. T. Blanford, Manual 
of the Geology of India, pt. i. p. 284. 
Sp. Char. “ A very globose shell, as broad as long. It is dis- 
tinctly umbilicated. The chambers are narrow, and the septa are 
^ Descrip, des Mollusques Fossiles de la Craie des Enyirons de Lemberg en 
Galicie, 1869, p. 8. 
^ Sometimes written Maastricht. • 
