NAniLIDJE. 
367 
JURASSIC. 
Rig. 78. 
a, view of the outer side of an upper mandible (No. 64000) ; h, lateml view of 
tbe same, showing a pad or swelling below the point of the beak ; <?, inner 
side of the same, showing a median, longitudinal swelling, increasing 
towards the extremity of the beak. From the Inferior Oolite of Swanswick, 
Bath, d, view of the outer side of an upper mandible (No. 34039 a) ; 
e, lateral view of the same, showing at i a series of shallow pits, 
caused perhaps by a fringed lip (see fig. 77, m) ; /, inner side of the 
same, showing a slight central swelling, which is continued, less pro- 
minently, towards tlie apex of the beak ; g, view of the outer side of a 
lower mandible (No. 0. 152G) with iji) remains of the horny expansions 
converted into carbonaceous matter. Tlie line of fine ridges wliich gives 
such an ornamental aspect to the lower mandibles was doubtless con- 
nected with the muscular attachment. From the Lias of Lyme Regis. All 
the figures are drawn of the natural size from specimens in the British 
Museum. 
liemarJes. D’Orbigny ^ has figured an U])per mandible from tbe 
Inferior Oolite of Moiitiers (Calvados), which he ascribes pro- 
visionally to Nautilus lineatus {=■ Nautilus obesus, J. Sow.), because 
it is the largest Nautilus of those beds. There is a specimen from 
the same locality (Moiitiers) in the British Museum (No. 73982). 
A large, imperfectly preserved sj^ecimen (No. 24235), from the 
Inferior Oolite of Yeovil, Somersetshire, resembles this one, but it 
is of a narrower form. 
Pal. Fran^. — Terr. Jurass. 1842, vol. i. pi. xxxix. figs. 3-5. 
