87 
PHOLADOMYA Murchisoni. 
TAB. DXLV. 
Spec. Cuar. Oval, with large beaks ; the ante- 
rior side short ; six or seven prominent, ob- 
tuse, knotted ribs ornament the middle. 
a 
A straicurt shell, whose sides are smooth and free 
from ribs; the ribs near its anterior side are much the 
largest. 
The present secretary of the Geological Society, Ro- 
derick Impey Murchison, Esq., influenced by a highly 
praiseworthy zeal for the advancement of geology, last 
summer (1826) visited the remote district of Brora in 
Sutherlandshire, where coal has been worked for some 
years. His valuable observations are presented to the 
Geological Society, and his collection of fossils, among 
which are several new ones, liberally offered for the 
use of “ Mineral Conchology”’ : no apology is therefore 
necessary for naming a shell after such a friend. 
The shell before us is the same as was brought from 
Brora by Mr. Farey, and figured along with Phola- 
domya (Cardita) margaritacea upon t. 297, at fig. 4: 
but more perfect specimens have enabled us to define 
the species, although they are often much and variously 
compressed. 
Brought by Mr. Murchison from Brora, along with 
several new fossil shells hereafter to be figured, and 
the exact position of which will be described by him in 
the Paper (now in preparation for the Geological So- 
ciety) upon the Brora Coal Field and other contempo- 
raneous formations in the north of Scotland. 
Fig. 1 & 2. from the roof of the coal. ; 
Fig. 3. is from a ledge of rocks opposite the Old 
Salt Pans. 
