28 
cies which still inhabits the sea; but until nearly whole 
individuals are met with, it would not be just to speak 
too positively : for although several other of the Crag- 
shells correspond with recent species, we must not be 
too hasty in supposing shells from distant parts to have 
been mixed accidentally with the Crag. Most, if not all 
the other shells that agree with recent ones, are such as 
may still be found on the neighbouring shores ; while 
the nearest habitat of the Chama Cor is the Irish coast. 
There are found near Verona, and in other places 
abroad, casts in limestone of an Isocardia resembling the 
Cor, but more ventricose, shorter, and smaller. Such 
probably occur in England, perhaps even at Heddington 
in Oxfordshire (see Plott’s Oxfordshire, page 127) ; but 
we have not met with any specimen of which we know 
the locality. We propose to call it I. ventricosa. 
