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. CCCCLXXXIL— /g^. 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 carinas 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 {fig. 2.) has but 

 two in place of four, and these even are lost near the 

 aperture. 

 Found rarely in the Black-Rock at Cork. 



