Geological Society of London. 189 
lanceolata, n.sp., A. obtusa, Ludwig, A. angusta, n.sp., A. subcentralis, 
Salt., A. pumila, Salt., A. senex, Salt., A. obovata, n.sp., A. nsp., 
A. Wardi, Salt. MS. 
3. “Geological Remarks on certain Islands in the New Hebrides.” 
By Lieut. G. C. Frederick, R.N. (Communicated by Sir Archibald 
Geikie, D.Sc., For.Sec.R.S., V.P.G.S.) 
As far as can be judged from the soundings obtained, the New 
Hebrides are probably situated on a bank lying from 3850 to 400 
fathoms below the surface of the ocean and running in a N.N.W. 
and §.8.H. direction, with a deep valley between it and New Cale- 
donia. The only two soundings obtained between these two groups 
are 2375 and 2730 fathoms, the former within a short distance of 
the New Hebrides. 
Of the Islands, Tanna is volcanic—an active volcano, apparently 
consisting entirely of fragmental material, being situate on its 
eastern side. Hfaté has some volcanic rock, but is chiefly of coral 
formation. It rises to a height of 2203 feet, and in some parts has 
a terraced appearance, the terraces denoting distinct periods of 
upheaval. Coral was found to the height of 1500 feet above sea- 
level. To the north of Efaté are Nguna, Pele, and Mau, of volcanic 
origin, and no coral has been found on them above sea-level; whilst 
Moso, Protection, and Hrrataka, to the west of Hfaté, are of coral 
formation and similar in character to the adjoining coast of Hfaté. 
In the vicinity of the coral isles is very little coral-reef, especially 
when the shores are steep. Delicate live corals were brought up 
from depths of 28, 39, and 42 fathoms off Moso, 87 fathoms near 
Mau, and 40 fathoms off Mataso. Mataso is a volcanic island with 
a narrow fringing-reef. Makura (six miles N. of Mataso) and Mai 
are also volcanic with narrow fringing-reefs partly surrounding the 
former and entirely encircling the latter island. A short distance 
west of Mai is Cook’s Reef, of atoll formation. The Shepherd Isles 
are all of volcanic formation, apparently recent, and no coral was 
found growing around their shores. Mallicolo Island is of volcanic 
and coral formation. At one place in this island coral was found at 
a height of about 500 feet above sea-level. 
IiI.—March 8th, 1893.—-W. H. Hudleston, Esq., M.A., F.BS., 
President, in the Chair. The following communications were read : 
1. “On the Occurrence of Boulders and Pebbles from the Glacial 
Drift in gravels south of the Thames.” By H. W. Monckton, Esq. 
North of the Thames near London, the Glacial Drift consists . 
largely of gravel, which is characterized by an abundance of pebbles 
of red quartzite and boulders of quartz and igneous rock. With the 
exception of very rare boulders of quartz, the hill and valley gravels 
of the greater part of Kent, Surrey, and Berkshire are entirely free 
from these materials. The author points out that the river Thames 
is not, however, the actual southern boundary of the distribution 
of these Glacial Drift pebbles and boulders, though the number of 
localities where they are found in gravels south of that river is 
few. The author describes or mentions several, of which the 
following are the most important :—Tilehurst, Reading, Sonning, 
