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XXXIIT. 
ON DERIVED CRYSTALS IN THE BASALTIC ANDESITE 
OF GLASDRUMMAN PORT, CO. DOWN. By GREN- 
VILLE A. G. COLE, M.R.LA., F.G.8., Professor of 
Geology in the Royal College of Science for Ireland. 
[Abstract of a Paper published in eatenso in the Scrmntir1c TRANSACTIONS OF THE 
Royat Dvusurin Society, Vol. V.] 
Tue author described a large composite dyke showing at this 
point a band of andesite on each of it, from 4 to 17 feet wide, 
and a more recent dyke of eurite in the centre, 36 feet across. 
The eurite includes numerous blocks of andesite, and sends off 
veins into it; but the pyroxene and glass of the latter rock have 
pecome remelted at the contact, a delicate interpenetration of the 
two magmas has occurred, and the porphyritic crystals of quartz 
and pink felspar from the eurite are found completely surrounded 
by the dark andesite. Thus a pre-existing rock comes to include 
erystals derived from one that has subsequently invaded it, and 
hand specimens, without study in the field, would be of a most 
misleading character. 
XXXIV. 
ON THE FOSSIL-FISH REMAINS OF THE COAL MEASURES 
OF THE BRITISH ISLANDS. PART I].—Acanruopwwa. 
By tae tate JAMES W. DAVIS, F.G.S., F.L.S., F.S.A., &e. 
[This Paper is published in the Screntiric TRANsAcTions oF THE Royat DuBLin 
Socrery, Vol. V.] 
SCIEN. PROC. R.D.S., VOL. VIII., PART IIT. x 
