24 Proceedings of the Royal Physical Society. 
So many of these are either so rare, or else unknown in 
the recent eastern seas of Scotland, that it seems feasible to 
suppose that some alteration has ensued since these deposits 
were laid down. ; 
Since the paper on Largo Bay was read, I have been made 
acquainted with a very interesting notice of “The Raised 
Sea-Bottom of Fillyside,” on the opposite side of the Firth to 
Largo, and, after careful comparison of the faunas of each 
locality, am disposed to consider them as nearly of the same 
age, the facies of the two being very similar; and this would 
probably be more apparent if a larger series of the shells 
were examined, so many having been listed from single 
examples. 
A combination of the’ Largo and Fillyside species shows, 
upon analysis, that of the 155 molluscs— 
46 species are common to both deposits, 
89 ,, have only been found at Largo, 
a, : : ,  Fillyside, 
155 
and that, out of these 155 species, only 52 have been 
obtained out of the various post-Glacial fossiliferous deposits 
of the east coasts from the earliest to the latest developments, 
including Elie, King Edward, and Caithness; and, if the 
latter had been eliminated, the numbers would have been 
even less. 
Excluding all reference to the earlier Pliocene, the 
appended list shows that 16 species do not occur (or have 
not been recorded) in any other post-Pliocene deposit in the 
three kingdoms, that 34 species have their nearest geological 
homes either at Kelsey Hill or Bridlington in Yorkshire, 
Selsey in Sussex, in the Lancashire drifts, the Belfast 
Estuarine Clays, or the Portrush accumulation, and the 
remaining 53 are common to the clays and other strata in the 
western side of Scotland, chiefly in the line of the Clyde. 
