GUPPY— -DOMIXICA. 
379 
Worts, whilst the volcanic deposits include fine 'sand, ad- 
mirably suited for combination with the lime to make 
mortar. 
The marine formation (5 in the diagram) above alluded 
to, seems to’have been part of an immense fringing reef, 
which existed when the Island was at a lower level by some 
300 feet. The diagram will help to explain the principal 
features of these formations, and it also shows a similar 
coral bed at Morne Daniel. It contains the same species, 
of shells and corals. This marine fossiliferous formation 
is overlain by more recent volcanic accumulations, repre- 
sented in the diagram by the letters. Craters do not 
seem to occur on the higher mountains, but small volcanic 
cones, often very perfect, exist on the lower ridges. A 
group of them is shown in the plate. I did not observe 
that dykes of trap or stony lava were at all frequent. 
Most of the rocks are varieties of trachyte of every shade 
of color, — pink, grey, brown, and white, rarely but occa- 
sionally passing into cellular basaltic lava containing large 
crystals of felspar. 
On the 12th November I ascended Mount Kuliabon, 
stated to be 3,379 feet high. This mountain seems to be 
entirely composed of volcanic rocks, and its upper part is 
shrouded in a dense forest full of lycopods, and with im- 
mense festoons of mosses and ferns clinging to the trees. 
Often this cryptogamic vegetation formed a tangled mat 
around the smaller trunks, and was 8 or 9 inches deep. 
Among it I found specimens of a curious mollusk ( Amphi- 
bulima pardalinaj , the body of which is much larger than 
its shell. The animal was semilucent and whitish, some- 
what like a bit of ice dipped in milk. In the forest I also 
collected other mollusks, namely, Bulimidus laticinctus , 
llgalma Baudoni (or ccncolor ), Helix nigrescent, 11. bad'i(f f 
