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264 MARINE MOLLUSCS. 
luscs belonging to no other parts of Great Britain, 
and at the same time it is highly probable that our 
exposed position to the Channels and the Atlantic, 
enables us to collect on the more exposed beaches 
the absolute products of other countries accidentally 
cast up by the fury of the waves during storms from 
very considerable depths. The “ Crozier nautilus” 
(Nautilus spirula) was found some years since on 
the beach of Ballyskelligs Bay, Ireland, and Mr. 
O’Kelly the finder, conjectures with propriety that 
it was washed thither by the Atlantic waves 
from the shores of America. Dr. Turton has since 
found specimens on the beach at Teignmouth, so 
that probably it may hereafter be determined that 
this species 1s capable of supporting existence 
sparingly in our climate. The violence of squalls 
affecting the Atlantic drives to the coast of Ireland, 
and more sparingly the western coasts of England 
the delicate “* Storm shell” ; (Ianthina vulgaris) 
it has been captured not unfrequently on the north- 
west coast of Cornwall, and has been also taken at © 
Teignmouth. Gales of wind drive to the southern 
shores of England specimens of the “ Sea ear” 
(Haliotis tuberculata) which belong properly to 
the Channel Isles. The north-eastern limit of 
Buccinum lineatum is probably the southern 
English coasts. Panopea Aldrovandi, found in 
France and Spain extends sparingly to the southern 
coasts of England. 
Presuming that the intermediate coasts have 
been well examined it ought to be deemed sur- 
prising that the coast of Devon participates so 
strongly in the marine molluscous productions of 
very distant spots, thus a variety of shells are 
found solely at Dublin and on the Devon shores, 
and though it is not very astonishing that so many 
have been found common only to Devon and Guern- 
sey, and—seeing the more exposed position and 
