82 Leonhard 8^ Geinitz's Neues Jahrbuch. 



"Eeport of the Medical Officer of the Privy Council," 1868; and 

 now some very useful and accurate Geological Models of the South- 

 east of England, by Messrs. Topley and Jordan, are published by 

 Stanford, of Charing Cross ; and these, with the Maps and Sections 

 of the Geological Survey, enable the student to master most of the 

 difficulties and complications that affect this classic area, which 

 indeed becomes more and more an object of interest on account of 

 the boring exploration through its lower stages in progress at the 

 present time. T. E. J. 



III. — Leonhaed und Geinitz's Neues jAnRBUCH. Jahrgang 1872, 



Hefte 3-6. 



THESE four numbers contain, besides several instructive minera- 

 logical and petrographical memoirs, some of which are in con- 

 tinuation of papers enumerated, in our last notice of the "Jahrbuch" 

 (see Vol. IX., pp. 560-562), three geological papers of considerable 

 interest. The old schistose rocks of a part of the Erzgebirge, 

 between Blankenstein and Grund, are described by Dr. Mietzsch 

 (pp. 561-572). Interpreted according to the modern theory of 

 metamorphic rocks, these old limestones, clay-slates, siliceous schists, 

 quartzites, and gneiss, are becoming better understood, but call for 

 more labour yet. Dr. Jentzsch (pp. 449-480) treats in detail of the 

 alluvial and diluvial deposits near Dresden, drawing conclusions as 

 to the order of events and successive changes associated with the 

 formation of these loams, sands, and gravels, with their far-derived 

 and " erratic " contents. 



Dr. C. W. Giimbel describes (pp. 241-260) and illustrates (plates 

 vi. and vii.) two of the most interesting among the Foraminifera 

 that have ancient fossil representatives and yet exist at the present 

 day. 



One of these Dr. Giimbel carefully characterizes as NiimmuUna Jur- 

 assica, found in a Jurassic limestone of the zone of Ammonites tenui- 

 lohatus, especially in the siliceous Sponge-limestone, which in France 

 follows on the marly main tenuilohatus-heds, and is there more 

 strongly marked by Am. dentatus. His specimens are siliceous, and 

 in considerable numbers from Schaflohe, near Amberg. 



The other Foraminifera under notice, and of large size, too, are 

 Orbitulites priBcursor and 0. circumvulvata, from the grey limestone, 

 with Megalodus pumilus (Eotzo beds), of the Alpine Lias, near 

 Eoveredo. 



Orhitidites was not previously known to be of older date than the 

 Upper Chalk ; and though Nummulina is quoted from the Oolite, and 

 even from the Carboniferous Limestone, exact information is still 

 wanting. Dr. Giimbel clears up some obscurities about supposed 

 Cretaceous Nummulites (such as Alveolina Fraasi, formerly thought 

 to be a Nummulite), and has thus added much in this branch of 

 palaeontology. T. E. J. 



