83 
ELLIPSOLITES ovatus. 
TAB, XXXVII. 
Spec. Char. Gibbose, umbilicated, edges rounded, 
inner volutions nearly concealed by tlie outer; 
surface smooth; aperture obtusely saggittate. 
At first sight this has scarcely the appearance of an invo- 
lute shell, the general form is so round, the inner volutions 
so nearly concealed, and the aperture, from the narrowness 
of its sides, so obscure; both sides of the shell are alike, 
and the umbilicus equally deep in both. The greatest 
diameter is about twice the thickness of the shell, and one- 
third longer than the shortest diameter. I have not been 
able to trace the septa. It is usually obliquely pressed. 
I do not know that this has been described in any shape. 
It is sufficiently remarkable to attract notice, especially 
as it is one of the various productions of the Black-rock 
near Cork; which, reasoning from the fossils it contains, 
Geologists will hereafter distinguish as a particular forma- 
tion ; it is a very foetid Limestone. My thanks are due to 
Samuel Wright, Esq. and Dr. Wood, for the only tw® 
specimens I have seen. 
