TO GEOLOGY. 123 
of 
The genus Solarium in England, where seven species 
have been described, has been observed as low down in the 
series as the Inferior Oolite. Mr Sowerby describes four 
from the London Clay. M. Deshayes gives, in his Tables, 
ia sixteen species from the Tertiary. Eight of these are from 
_._the Eocene of the Paris basin, and six from the Pliocene of 
the Subappennines. Mr Conrad has described a species 
from Claiborne, the elaboratum. 
¥ 
/ 
— GENUS ORBIS. (nobis.) 
Description. Shell orbicular, discoidal, umbilicate ; 
mouth quadrangular ; ‘umbilicus large, spiral; all the 
= whorls on both sides visible ; columella none. 
__~ Yhave in vain endeavoured to place the shell on which 
I propose to found the above genus, in some one already 
= ablished. It appears to me to differ so essentially in 
aving quadrangular whorls, and of course having the 
mouth of that form, that I could not with propriety place 
it in the genus Solarium which it most resembles. It has 
a We ome resemblance to the genus JWaclurite (Lesueur), but 
é- differs in the plane of the sides and the mouth. 
5 teow 0, fotélla. Plate-4.” Big. 112: 
ao “Description. Shell flat above and below, bicarinate ; 
sc apex ‘rather impressed ; substance of the shell very thin ; 
* * suture linear ; umbilicus wide, perspective, carinate on 
“tal 3 
ih 
