90 
phunculus is central, on each side of it the septa are 
remarkably concave, so as to form two elliptical lobes. 
It is nearly as thick as wide. 
From Closeburn, with the last. Fig. 3 is from an 
impression taken in pipe-clay from the specimen repre- 
sented at fig. 2. 
NAUTILUS tuberculatus. 
TAB. CCXLIX.---J7g\ 4. 
Spec. Char. Discoid, thick, largely umbilicate ; 
one row of large tubercles on each side ; front 
rounded ; aperture transversely elongated, two- 
angled. 
The width of the aperture is twice its length; the 
inner turns are almost wholly exposed by a large conical 
umbilicus. The septa are not very concave, but their 
edges are slightly waved. 
This Nautilus bears some resemblance to Ammonites 
Banksii in general form, but perhaps is not so thick. 
It is from Closeburn, by favour of C. S. Menteith, Esq. 
Fig. 5 represents the cast of some involute shell, the 
genus even of which I have not been able to discover. 
Should any observer be so fortunate as to meet with 
illustrating specimens, I should be happy to make them 
useful. I conceived all these specimens would be 
thought interesting as they are all from the same stratum, 
and there may never be better. 
/ 
