HIND : CARBONIFEROUS ROCKS OF ISLE OF MAN. 153 
are associated with Michelinia megastoma, which is supposed in 
other areas to indicate a low zone. I have not yet found 
this coral myself at Scarlet, but a specimen closely allied is to 
be seen in the breccia bed between the black shales and a small 
limestone knoll at Poolvash. 
Insular condition, which I have alluded to above, may be 
the cause of this faunal peculiarity. Migration may have occurred 
too late, or been unfavourable to certain forms of life, or bathy- 
metrical conditions, or environment may have prevented the 
establishment of organisms which flourished luxuriantly else- 
where at the same time. 
At any rate, I have done what is possible with the fauna 
as we know it to-day. Further researches may bring to light 
fossils which will give more definite evidence for the purposes 
of correlation. I have collected in aU localities myself and 
have endeavoured to see all public and private collections made 
from the localities, but unfortunately the rich character of the 
Poolvash Limestone has drawn collectors to that locality, and 
the less productive limestones of Derbyhaven, Langness, and 
and Ballasalla have not been searched as thoroughly as they 
might have been. 
As the title of the paper shows, I did not propose to deal 
in any way with the buried Carboniferous rocks of the northern 
area. These rocks have only been reached by borings, and 
fossil evidence is at present insufficient to form any views what- 
ever as to what part of the Carboniferous series occurs there. 
On page 288 Mr. Lamplugh quotes the presence of Pro- 
ductus longispinus, as determined by Messrs. Sharman and 
Newton. This species is not known below the Upper Dihuno- 
phyllum zone. No borings are deep enough, however, to give 
any indication of the thickness of limestones present. 
With regard to the Peel Sandstones, which I saw with 
Mr. Lamplugh, I can only say that I know of no rocks of Car- 
boniferous age which in any way resemble them, and the absence 
of any definite Carboniferous fossils, though some of the cal- 
careous beds are fairly fossiliferous, makes it very unsafe to 
assume that they belong to that age at all. I am aware that 
B 
