236 
NAUTILOIDFA. 
1860. Nautilus hexagonus, Wright, Quart. Jourii. Geol. Soc. vol. xvi. 
p. 27. 
1864. Nautilus liexagonus^ Eudes-l)eslongchamps, Etudes sur les Etages 
Jurassiques luferieurs de la Normandie, p. 149. 
1864. Nautilus hexagonus, Ebrav, Etudes Geologiques sur le Departe- 
ment de la Nievre, fasc. 13, 14, p. 236. 
1864. Nautilus hexagonus, Damou, Supplement to the Handbook to the 
Geology of Weymouth and the Isle of Portland, pi. v. f. 10. 
1871. Nautilus hexagonus, Phillips, Geology of Oxford and the Valley 
of the Thames, pp. 305, 323. 
1873. Nautilus hexagonus. Sharp, Quart. Journ. Geol. Soc. vol. xxix. 
p. 290. 
1876. Nautilus hexagonus, Hudleston, Proc. Geol. Association, vol. iv. 
No. 6 (“ The Yorkshire Oolites ”), pp. 373, 388. 
1878. Nautilus hexagonus, Hudleston, ibid. vol. v. No. 8, p. 482. 
1881. Nautilus hexagonus, Etheridge, in Fox-Strangway’s Geology of 
the Oolitic and Liassic Pocks to the North and West of Malton 
(Mem. Geol. Surv. Great Britain), p. 20. 
iSp. Char. “ Short cylindrical ; sides depressed, conical ; front 
broad, straight ; umbilicus small ; aperture sagittate, truncated ; 
siphuncle nearest the inner edge of the septum. 
“ In this species the septa are rather numerous and not much 
curved : its most remarkable character is the straightness of the 
lines that bound a section of it in the plane of the aperture, which 
section, being an elongated hexagon, has suggested the name.” 
{Sowerhy.) 
lienun'hs. It is highly probable that the Nautilus giyantem of 
d’Orbigny is identical with the present species, but without seeing 
the original specimen it would not be possible to decide the point, 
as d’Orbigny’s figures in the ‘ Annales des Sciences NatureUes ’ 
disagree very materially with those of the ‘ Paleontologie Erangaise.’ 
There is a very large specimen in the Collection which yields the 
following measurements, viz. greatest diameter 15 inches, umbilicus 
about 2 inches across, greatest breadth of the shell about 10 inches. 
Horizon. Stonesfield Slate ; Oxford Clay (including the Kelloway 
Pock) ; Corallian ; Kimmeridge Clay. 
Localities. British. Chippenham, Wiltshire ; Weymouth, Dorset- 
shire (Oxford Clay and Kelloway Pock) : Scarborough, Y'orkshire 
(Kelloway Pock) : Hinton, near Trowbridge, Wiltshire ; Yorkshire 
(Calcareous Grit) : Blisworth, Northamptonshire (Kimmeridge Clay) : 
Stonesfield (Stonesfield Slate). — Foreign. Havre, France (Kimmeridge 
Clay). 
Well represented in the Collection. 
