30 
MODIOLA pallida. 
TAB. VIII . — Three right hand lower figures. 
Spec. Char. Oblong, gibbous,, smooth, inferior 
margin straight, posterior side slightly swelled, 
beaks obtuse. 
Breadth above twice its length, blunt ish at the beak, and 
rounding at the other end with an angular turn towards the 
hinge; striae of growth distinct; shell a little glossy. 
I am indebted to our indefatigable friend, A. B. Lambert, 
Esq. for specimens of this in flinty Chert, found at Fonthill, 
adjoining the Limestone quarries, where many shells are 
partly dissolved as it were in Flint, Hornstone, or Calce- 
dony. This shell, as well as most others, among which are 
Ammonites, Tellens, &c. are rather Calcedony. 
MODIOLA laevis. 
TAB. VIII .—Left hand lower figure . 
Spec. Char. Sub triangular, very smooth, convex, 
inferior and posterior margins nearly straight, 
united by a short curve ; beaks small. 
Breadth rather less than twice its length, very smooth, 
scarcely showing the lines of growth, inferior margin nearly 
equal to the anterior margin, posterior side protuberating a 
little, anterior side rather depressed. 
A little congregation of these are on a piece of foetid 
Limestone, or Swinestone, of some Authors, sent me by 
Miss E. Hill, who gathered it the ruins of Caerphilly Castle, 
Glamorganshire. With it I received this remark, that 
u this Castle was built by Robert Fitz-hammon, in the year 
1110, and the stones of Barry Island have the same shell in 
much the same state, and consequently no visible change 
has taken place in 702 years.” 
