Seebach— On the Hanoverian Sine. 501 
the experiments of Delesse and Daubrée* and the discoveries and 
opnions of Sedgwick, Ramsay, and Murchison, concerning the origin 
of the porphyritic rocks of North Wales and the Lake District. 
NOTICES OF BRITISH AND FOREIGIN 
MEMOTRS. 
Hp 
I. Der Hannoverscuz Jura. By Kart von Srepacu. Berlin, 1864. 4to. 158 pp. 
4 cana work is a very useful and very valuable addition to the 
previous memoirs illustrative of the geology and fossils of North 
Germany, by Roemer, Strombeck, Credner, Wagner, Schlonbach, 
&c., as also to those of Oppel and Quenstedt. It is divided into two 
parts, Geological and Paleontological, comprising 158 pages of 
letterpress, a geological map, and 10 plates of fossils. The first 
part contains a sketch of the geographical distribution of the Jura 
formation in North-west Germany, a description of the various 
strata, and some general remarks on the whole group. ‘The lowest 
bed, which is but briefly noticed, is the zone with Avicula contorta. 
The Jurassic beds are described under three sections—the Lias, 
Dogger, and Upper Jura; each of these again subdivided into certain 
zones or strata, somewhat similar to those usually adopted by geolo- 
gists for the Oolitic group. The Lias comprises nine of these zones, 
of which four belong to the lower, three to the middle, and two to 
the Upper divisions. The Dogger contains six, and the Upper Jura 
nine. 
Dr. Seebach’s subdivisions, and his lists of characteristic fossils, 
will donbtless be found useful for comparison with those of the Bri- 
tish area. Dr. Seebach himself is inclined to consider that the 
Lower Jura formation of Hanover, up to the Cornbrash, resembles 
that of South Germany, whilst the Baltic Jurassic strata present a 
greater similiarity to the French and English types. 
‘The second or Paleontological part contains a table of 3738 species, 
zoologically classified, and showing at the same time their geological 
distribution. ‘This is followed by a description of the new species 
named by the author, and critical remarks upon species previously 
described ; the whole forming a useful contribution to the paleonto- 
logy of the Jurassic formations.—J. M. 
II. SxercH oF THE GEOLOGICAL STRUCTURE OF THE SOUTH STAFFORDSHIRE CoAL- 
FIELD. By J. Buenre Juxus, M.A., F.R.S., &e. (Prepared at the request of the 
South Staffordshire Local Committee, for the use of Members of the British 
Association, at the Birmingham Meeting, 1865.) Birmingham, 8vo., pp. 20. 
E reprint the following extract from Professor J. Beete Juke’s 
pamphlet on the Position and Lie of the Rocks in the South 
Staffordshire Coalfield. 
* Also, Observations on the Structure of Mount Sorrel Syenite, by H. C. Sorby, 
F.R.S., noticed at p. 448 of Gzoroaican Magazine for October. 
