144 GEOLOGY. 



6. AFRICA, 



Anon. The Proposed Inland Sea in Algeria. Jouni. Soc. Arts, 

 vol. xxiii. no. 1186, pp. 827, 828. 



Gives the results of the French Exploring Expedition. The depression 

 that can be flooded is 6000 square kilom. in area. " None of the fine 

 oases of the Souf would be immersed." The existence of the depression, 

 which has been doubted, is thought to be placed beyond doubt. W. W. 



Blanford, H. F. Indo-Oceanic Continent, see p. 134. 



Bleicher, — . Note sur les gisements de Polypiers des terrains ter- 

 tiaires moyen et superieur des provinces d'Oran et d' Alger. [The 

 Coral-deposits of the Middle and Upper Tertiary Basins of Oran 

 and Algiers.] Bull. Soc. Geol. France, 3 ser. t. iii. pp. 284-287. 

 The Middle Tertiary is divisible into the following stages (in ascending 

 order) : — 1. The Cartennian, with a special fauna of Echiiiids, corals, and 

 particularly of Petro-Spongidee. 2. The Helvetian, with banks of Ostrea 

 crassissima, and a remarkable series of Echinids, Corals (generally new 

 forms), and Eoraminifera. 3. The Sahelian, abounding in fishes, Bryozoa, 

 Corals, Echinids, &c. The coral localities in these divisions are enume- 

 rated. Only two localities for Pliocene Corals are known. G. A. L. 



. [Tangiers, El Araich, Meknes.] Rev. Geol. t. xii. pp. 176, 



177. 

 The divisions recognized are : — Quaternary, Pliocene, Miocene, Num- 

 mulitic, U. and M. Cretaceous, and Jurassic. 



Brown, John Croumbie. Hydrology of South Africa ; or details of 

 the former hydrographic condition of the Cape of Good Hope, and 

 of causes of its present aridity ; with suggestions of appropriate 

 Hemedies for this aridity. Pp. vii, vi, 260. 8vo. London. 

 Describes the physical geography of S. Africa, and draws inferences 

 respecting its former hydrographic condition ; gives a sketch of the 

 geology of S. Africa ; discusses the cause of the present aridity ; sug- 

 gests means of overcoming this aridity, and of preventing the occurrence 

 of torrential floods. E. W. E. 



Calderon, Salvador. Eeseiia de las rocas de la isla volcanica Gran 

 Canaria. An. Soc. Espan. Hist. Nat. vol. iv. part 3. 



A geognostic description of the Gran-Canaria Island, with a catalogue 

 of the different volcanic and sedimentary rocks therein found. Six 

 woodcuts in the text show various effects of volcanic action. J. McP. 



Cohen, Dr. E. Erlauternde Bemerkungen zu der Eoutenkarte einer 

 Eeise von Lydenburg nach den Goldfeldern und von Lydenburg 

 nach der Delagoa-Bai im ostlichen Siid-Afrika. Jahresher. geogr. 

 Ges. Hamburg. Pp. 116, map. 



. tFeber einige eigenthiimliche Melaphyr-Mandelsteine aus 



