ON THE ICTIS OF DIODORUS SICULUS. 313 
lago of barren rocks, called The Longships. 
These are situated about two miles west of the 
Land’s End; and in the time of Diodorus were 
probably connected together, so as to form one 
island, which, at low water, was joined by an 
isthmus to the main land. Nor is this mere 
conjecture. ‘ The inhabitants,” says Camden,* 
“are of opinion that this promontory did once 
reach further to the west; which the seamen posi- 
tively conclude from the rubbish they draw up.” 
It is well known, that there has been a consid- 
erable subsidence of the land on this coast. Of 
this, the animal and vegetable remains found at 
the Carnon stream-works, the submarine forest 
near St. Michael’s Mount, and the disappearance 
of tithable land from beneath the cliffs of Penz- 
ance, afford ample proof; and if, as Sir Henry 
T. De la Beche has well remarked,} the present 
bed of the sea were raised about thirty feet, in 
the direction of the ten-fathom line, numerous 
small portions of dry level country would be 
produced in some situations, while in others large 
* Gibson’s Ed. of Camden’s Britannia; vol. I. p. 148. 
Lond. 1772. 
t Report on the Geology of Cornwall, &c.; chap. xiii. 
p- 421. 
