384 Hqjorfs and Proceedings — Geological Society of London. 



the island of Madagascar. A central plateau from 4000 to 5000 feet 

 high occupies about half the island, rising above the lowlands that 

 skirt the coasts, and from this plateau rise in turn a number of 

 volcanic cones, the highest, Ankaratra, being 8950 feet above the 

 sea. With the exception of certain legends, there is no record of a 

 period when the volcanoes were active : two such legends were given. 



The known volcanic cones were enumerated. They extend from 

 the northern extremity of the island to the 20th parallel of south 

 latitude. Beyond this granite and other primitive rocks occur as 

 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 is parallel to the long axis of the 

 island. Marine fossils have been found by Rev. J. Eichardson and M. 

 Grandidier in the south-west part of the central plateau. These 

 fossils are referred by the last-named traveller to the Jurassic system. 

 Eemains of Eippcpotami, 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 Anaka- 

 ratra, sandstone and slate occur. North of this volcanic district 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 Lichenoporidae." By G. R. Vine, 

 Esq. Communicated by Prof. P. Martin Duncan, E.R.S., F.G.S. 



In this paper the author referred to the views of Mr. Hincks on 

 the genera belonging to the family Lichenoporidse, and especially to 

 his suppression of the genus Eadiopora of D'Orbigny, the species of 

 which are placed by Mr. Hincks in the genus Liclienopora. The 

 author remarked that the type species of the division of the latter 

 genus identified by Mr. Hincks with Badiopora, D'Orb., the Lower 

 Greensand Badiopora pustulosa, D'Orb., and other fossil species, show- 

 structural peculiarities which would seem to distinguish them, 

 although perhaps not generically. He described in some detail the 

 characters of the above-mentioned species under the name of Liclieno- 

 pora pustulosa ; and further described what he believed to be a new 

 species from the Greensand of an unknown locality under that of 

 lAchenopora paucipora. 



