PISSUlflELLA graeca. 
TAB. CCCCLXXXI1I. 
Spec. Char. Ovate, oblong, convex, radiated; ra- 
dii decussated by elevated lines, and thickened 
at the intersections ; perforation small, elonga- 
ted ; margin of the base crenulated. 
Syn. Patella graeca Linn. &c, Brocchi, 2. 259, Fis- 
surella graeca, Lam. Syst. 6. p. 2,11. Deshayes , 
Coquilles Foss. 2. p. 19. t. 2. Jig. 7, 8, and 9. 
There is a considerable degree of variation to be ob- 
served in the number and proportion of the rays upon 
the shell : but in general they are in sets, composed 
of one large and two small ones ; and between each 
set is a still larger ray. The base is arched and ovate, 
with the anterior portion smallest. The surface is fre- 
quently antiquated, especially in the fossil specimens, 
which have also smaller and more numerous rays than 
the generality of recent ones ; but the latter are subject 
to much variation, as observed above. 
Found in the Crag of Ipswich, many years ago, by our 
valued friend the late Mrs. Cobbold, whose assiduity in 
collecting Crag shells, and generosity in bestowing them, 
have been so often proved in the course of this work, 
that every lover of science mUst join us in lamenting her 
loss, even if she had not possessed other high qualifica- 
tions for which she was esteemed by all who knew her. 
The Rev. G. R. Leathes has also furnished us with 
specimens. 
