139 
The object of its author was mainly to prove that with 
specimens in cabinets and in cases he had observed a spon- 
taneous metallic-growth chiefly upon the surfaces of rock 
specimens from mines and upon ores of some of the metals. 
The paper described in details many such, from the author’s 
cabinet, and from the museums in England and on the con- 
tinent, chiefly growths of gold, silver, electrum, or argen- 
tiferous gold, copper and titanium. 
The specimens exhibited by Mr. Plant had been identified 
by Mr. Read win as gold-growths in thin sheets, and as 
globules of gold, and Mr. Plant was able to authenticate the 
development or growth of the gold upon the specimens 
since 1868. He had specimens of copper also recently 
developed as stalactites or moss copper. Changes in pyrites 
and sulphides generally were a well-known nuisance in all 
collections, but these metallic-growths were a new thing to 
him, and it is yet an interesting point to learn their cause, 
and watch whether the end be amorphous bundles or true 
crystals. 
The paper, of which the following is an abstract, was read 
at a meeting of the Section, held January 14th, 1878 : — 
“ The Mollusca of Cymmeran Bay,” Part IV., by J OHN 
Plant, F.G S. 
For four years a systematic search has been made in this 
locality for the local mollusca, and already the Section has 
had several communications upon the species, lists of which 
have appeared. The additions in 1877 were very few, as 
the summer was unfavourable for much dredging outside 
the bay, but the total of species found on shore or dredged 
is now two hundred. 
The bay is five miles wide from Bhoscolyn Beacon to 
Ynys Mabion, with a broken shore line of above 9 miles, part 
bold cliff, part sands, and some reef — the bay is full of reef 
rocks running NNE by SSW., with narrow vallies of sand 
