538 
The British Association. 
[October, 
ance. There were rumours of the discovery of another 
archaeopteryx in the Solenhofen Slates, which is said to 
present the head in a much more complete condition than 
that in which it occurs on the magnificent slab now in the 
British Museum. As yet, the jaws have not had the matrix 
removed from them ; but should they prove to be armed 
with teeth, it would to him be a cause of satisfaction rather 
than surprise, as an opinion he expressed some fifteen years 
ago, would be confirmed, viz.: that this remarkable creature 
may have been endowed with teeth, either in lieu of or com- 
bined with the beak. 
Professor Hull, F.R.S., then proceeded to give a sketch 
of the geology of the environs of Dublin. 
Mr. J. Nolan, M.R.I.A., read a paper “ On the Ancient 
Volcanic Districts of Slieve Gullion, between Dundalk and 
Carlingford Bays.” 
Mr. Mattieu Williams, F.R.A.S., F.C.S., read some valu- 
able notes “ On the Glaciation of Ireland and the Tradition 
of Lough Lurgan.” The first part of this paper discussed 
the origin of the ridges of drift which cover so large an area 
of Ireland, and the faCt that this, like all the other varieties 
of till or boulder clay, are unrepresented by the moraines of 
existing Alpine glaciers, which have no such clayey matrix ; 
while, on the other hand, true moraines, such as we now 
see in the course of formation, are the rarest of all the 
vestiges of ancient glaciation. The author’s explanation of 
this is that the ancient glaciers of Ireland, Scotland, Nor- 
way, &c., for the most part terminated in the sea, and 
deposited the whole of their contents in still water as their 
terminal portions thinned and floated upwards; these deposits 
thus including the stony material of modern alpine moraines 
plus the fine particles that are washed out by the glacier 
torrent and now deposited lower down as alluvium. The 
heaping into ridges he explained by the fluctuations of ad- 
vance and recession of the glaciers at a later period. (These 
views are also described in the “Quarterly Journal of 
Science,” April, 1877.) 
The second part of the paper refers to an ancient legend, 
which describes a great fresh water lake occupying the site 
of Galway Bay, and the formation of the present bay by 
irruption of the sea through the ancient barriers of the lake. 
The author met with this legend very recently, and his 
recollections of the great drift ridges running towards the 
bay suggested the probability of their former extension 
across. To verify this he revisited the bay, re-examined 
