65 
P INNA g ran ul at a * 
TAB* CCCXLVIL 
Spec. Char. Broad, nearly equilateral, convex, 
obscurely decussated, with a small elevation 
In the centre of each division ; anterior side 
rounded. 
A broad shell, particularly thick about the anterior 
side and edge ; there is a rounded longitudinal elevation 
towards the posterior side which makes some fragments 
resemble those of a Mytilus ; the length of the specimen 
figured is 8| inches, the width 6. 
Some time ago I was shewn fragments of this shell 
from the Kimmeridge Clay, near Weymouth, and mis- 
took them for parts of Mytilus amplus, (M. Con. t. 27 .) 
which by the bye is surely a Pinna, by Prof. Sedgwick, 
The specimen figured being much more perfect has set 
me right I trust ; it is in the cabinet of Mr, De la Beche, 
who obtained it at Weymouth. 
