86 Reports and Proceedings—Geological Society of London. 
attention to a search for Scandinavian boulders, and obtained three 
specimens ; one (a violet felspar-porphyry) was from the shore, and 
the other two were from the collection of Mr. Savin. The first was 
considered to come from §8.H. Norway, and indeed Mr. K. O. 
Bjorlykke, to whom it was submitted, refers it to the environs of 
Christiana. 
The Author considered that the two specimens presented to him 
by Mr. Savin, who had taken them out of Boulder Clay between 
Cromer and Overstrand, were from Dalecarlia; and these were 
submitted to Mr. HE. Svedmark, who compared one of them (a brown 
felspar-hornblende-porphyry) with the Gronklitt porphyry in the 
parish of Orsa, and declared that the other (a blackish felsite- 
porphyry) might also be from Dalecarlia. 
_ IL—January 11th, 1893.—W. H. Hudleston, Hsq., M.A., F.B.S., 
President, in the Chair.—The following communications were read : 
1. “ Variolite of the Lleyn, and associated Volcanic Rocks.” By 
Catherine A. Raisin, B.Sc. Communicated by Prof. T. G. Bonney, 
D.Sec., LL.D., F.R.S., V.P.GS. 
The district in which these rocks occur is the south-western part 
of the Lleyn peninsula, marked on the Geological Survey map as 
“metamorphosed Cambrian.’ 
Some of the holocrystalline rocks are probably later intrusions. 
The igneous rocks, which are described in detail in the present paper, 
belong to the class of rather basic andesites or not very basic basalts ; 
they show two extreme types, which were probably formed by 
differentiation from an originally homogeneous magma. Corre- 
sponding to the two types of rock are two forms of variolite. 
These are fully described, and their mode of development is dis- 
cussed. 
The variolites occur near Aberdaron and at places along the coast. 
Their spherulitic structure often is developed towards the exterior 
of contraction-spheroids, and in this and in other particulars they 
correspond with those of the Fichtelgebirge and of the Durance. 
The volcanic rocks include lava-flows and fragmental masses, both 
fine ash and coarse agglomerate. They are associated with lime- 
stones, quartzose, and other rocks, which are possibly sedimentary, 
but which give no trustworthy evidence of the age of the variolites. 
2. ‘On the Petrography of the Island of Capraja.” By Hamilton 
Emmons, Esq. Communicated by Sir Archibald Geikie, LL.D., 
D.Sc., For.Sec.R.S. 
The rocks of Capraja consist generally of andesitic outflows resting 
on andesitic breccias and conglomerates. The southern end seems 
to have formed a distinct centre of volcanic activity, whose products 
are younger in age and more basic in character than the rocks of the 
rest of the island, and may be termed ‘anamesites.’ The lavas 
appear to have flowed from a vent at some distance from the cone 
which -probably occurred here and gave out highly scoriaceous 
fragments. In the other parts of the island andesite is almost 
everywhere formed, with patches of the underlying breccias here 
