129 
NAUTILUS globatus. 
TAB. CCCCLXXXI. 
Spec. Char. Subglobose, smooth, umbilicated ; 
whorls few, inner ones concealed, rather flat- 
tened on the front, rapidly increasing ; umbi- 
licus deep, with an angular margin ; aperture 
very wide, arched, with a deep sinus in the 
front. 
The thickness and diameter of this Nautilus are nearly 
equal, the sinus formed in the aperture by the preceding 
whorl is small, because the whorls increase rapidly in 
size ; the lip is divided into two rounded lobes by a deep 
and wide sinus, the septa are rather numerous. 
Many specimens of this fossil lately received from 
Cork, where it abounds in the Black-Rock, have proved 
it to be a Nautilus, and that it was a mistake to refer it 
to Bellerophon as I have done at p. 108, where a spe- 
cimen is mentioned. It is sometimes six inches in 
diameter. 
NAUTILUS multicarinatus. 
TAB. CCCCLXXXII.— fig. 1 and 2. 
Spec. Char. Discoid, subglobose ; inner whorls 
half exposed in a large deep umbilicus ; edge 
of the umbilicus angular ; front compressed, 
with several carinae on each side the middle. 
The sides of the whorls of this Nautilus are very nar- 
row and concave ; the front, which is broad, has in its 
middle a concave band, on each side of which are four 
sharp ridges besides the one that bounds the side : it is 
probable that these ridges diminish in number as the 
shell advances, for the larger specimen ( Jig . 2.) has but 
two in place of four, and these even are lost near the 
aperture. 
Found rarely in the Black-Rock at Cork. 
