7° PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 
far as lat. 22°, south of which the central parts of Madagascar are 
practically unknown to Europeans. 
Some crater-lakes and numerous hot and mineral springs occur. 
Earthquakes are occasionally felt in the island, most frequently 
in the months of September and October. The shocks are generally 
slight. 
Only a single trap-dyke is known near Antananarivo. The hills 
around this city are of varieties of granite (? granitoid gneiss). The 
general direction of the strata a parallel to the long axis of the 
island. 
Marine fossils have been found by Rev. J. Richardson and Mons. 
Grandidier in the south-west part of the central plateau. These 
fossils are referred by the last-named traveller to the Jurassic 
system. Remains of Hippopotami, gigantic Tortoises, and an extinct 
Ostrich-like’ bird have also been recorded. North and north-west 
of the fossiliferous rocks, between them and the volcanic district of 
Ankaratra, sandstone and slate oceur. North of this volcanic dis- 
trict again is a tract of country in which silver-lead (mixed with 
' zinc) and copper are found. 
Near the north-western edge of the central plateau are granitic 
escarpments facing northwards and about 500 feet high. Some 
details were also given of valleys through the central plateau and of 
lagoons within the coral reefs on the coasts. To these remarks 
succeeded some details of the physical features exhibited by the 
province of Imerina as seen from Antananarivo. 
14. ‘* Notes on some Cretaceous Lichenoporide.” By G. R. Vine, 
Esq. Communicated by Prof. P. Martin Duncan, M.B. Lond., F.R.S., 
F.G.8. 
The following specimens were exhibited :— 
Specimens of Jurassic Calcisponges and microscopic sections from 
them, exhibited by Dr. G. J. Hinde, F.G.S., in illustration of his 
aper. 
: Species of Conoceras, exhibited by T. Roberts, Esq., F. G.S., in 
illustration of his paper. 
Specimens from the Whin Sill and of American diabase, exhibited 
by J. J. H. Teall, Esq., F.G.S., in illustration of his paper. 
Specimens of Receptaculites from Canada, lent by J. F. Whiteaves, 
Esq., F.G.S8.; of Ischadites from the Isle of Gotland, lent by Prof. G. 
Lindstrom ; and microscopic sections of Acanthochonia from Bohemia ; 
exhibited by Dr. G. J. Hinde, F.G.S., in illustration of his paper. 
Specimens, exhibited by Dr. G. Ww. Parker, in illustration of his 
aper. 
ss Spee of the Core of the Richmond Boring, and the Thermo- 
meter with which the temperature was taken, exhibited by Collett 
Homersham, Esq., F.G.S. 
