108 
The following- species probably belong to the 1st Section, 
BELLEROPHON apertus. 
TAB. CCCCLX1X.— Jig. l. 
Spec. Char. Nearly sphaerical, without a 
band? inner whorls concealed, axis solid; 
sides of the aperture expanded. 
The sinus in the front of the aperture, and the expan- 
ded sides are conspicuous in full grown individuals of 
this species, which are from two to four inches in 
diameter ; as we have but little more than casts of the 
inside, the cast of the shell itself continuing no farther 
than two or three of the innermost whorls, we are not 
positive of the nonexistence of a band; the surface seems 
to be smooth, and the shell is very thick, so that the 
cast appears to be umbilicated, and shews the inner 
whorls : the front is rather prominent, and forms a kind 
of depressed and dilated keel around the whorl ; the ex- 
tremities of the aperture are rather square. 
The specimens just described were found in Lime- 
stone at Carlingford, in the County of Louth, and pre- 
sented by Samuel Wright, Esq. of Cork : they consist of 
compact Limestone, with many minute crystals of 
Carbonate of Lime, and a few of Sulphate of Barytes 
scattered over them. We have seen a large one front 
Settle in Yorkshire. 
We have specimens of an analogous shell from Ken- 
dal, another from Ireland, and a third from Bristol, all 
of which seem to be really umbilicated ; that from 
Ireland, has the cast of the outer surface of the shell, 
and is quite smooth : we wish to see more specimens of 
these before figureing them. 
BELLEROPHON Cornu- Arietis. 
TAB. CCCCLXlX.Tr; Jig. 2. 
Spec. Char. Rather compressed ; whorls 
few, rapidly enlarging, carinated near the 
aperture ; aperture expanded ; shell very 
thick : sinus large and angular. 
rp . 
iiE expanded lip of the aperture of this species is 
divided by the sinus into two rounded lobes ; we know 
not whether the shell is umbilicated or not, as we 
possess only casts of the inside; the shell appears to be 
3-8ths of an inch thick in some p&rts ; the inner whorls 
are very small. 
Pound in a brownish limestone, near Kendal, in West- 
moreland ; the space formerly occupied by the shell, 
partly filled with fcliite calcareous Spar. 
