14 GEOLOGICAL MEMOIRS. 
28 feet 104 inches thick, immediately below the anhydrite, it became 
necessary to clean it out thoroughly. In this process fragments of a 
compact mineral, remarkable for its pure, almost snow-white colour, 
were brought to the surface. Here it soon assumed a dirty white, 
or rather pale yellowish white colour. Its specific gravity is 2°9134 
(at 12° C.), and its hardness between 4 and 5. In external ap- 
pearance it agrees with white limestone. On analysis it was found 
to consist of the following substances :— 
29°48 magnesia. 
69°49 boracic acid. 
1:03 carbonate of protoxide of iron with traces of carbonate of 
—_— protoxide of manganese and of hydrous peroxide of 
100°00 iron. 
The mineral has consequently the exact composition of the bora- 
cite, hitherto only found crystallized in the gypsum at Luneburg and 
at Segeberg in Holstem. The large quantity of compact boracite 
brought up from the small bore, only 4 inches in diameter, renders 
it probable that it forms an essential portion of the rock-salt forma- 
tion at Stassfurth. This fact is not only interestmg im itself, but 
also as furnishing an explanation of the vapours of boracic acid that 
escape from the earth m some parts of Italy and of the borax lakes 
of Thibet. It is probable that compact boracite may be found in 
other rock-salt deposits, smce, from its great similarity in external 
characters to limestone, it may easily have been mistaken for this, or 
overlooked. 
(J. N.] 
The CePpHaLopvops of the SALZKAMMERGUTS, from the collec- 
tion of His ExcELLENCY THE PRINCE VON METTERNICH; @ 
contribution to the Paleontology of the Alps. By FRANZ von 
Haver (Die Cephalopoden des Salzkammergutes, etc.), with a 
Preface by Witt1amM HaipinGer. Vienna, 1846, 4to. pp. 48, 
eleven plates. 
In this work, published at the expense of Prince Metternich, the son 
of the Privy Counsellor, Von Hauer, whose collection of fossil fora- 
miniferze is now so well known from the description of D’Orbigny, 
gives an account of some of the remarkable Ammonites and other 
fossils found in the neighbourhood of Hallstatt. These remains were 
often seen in collections, but had rarely been described or figured. 
In this work the following species are fully noticed and represented 
in the accompanying plates :—Ammonites Metternichu ; A. neqju- 
rensis, Quenstedt; A. debilis; A.galeatus; A. subumbilicatus, Bromn ; 
A. amenus; A. Ramsaueri, Quenstedt ; A. angustilobatus; A. tor- 
natus; A. bicrenatus; A. salinarius; A. Johannis Austria, v. 
Klipstein; 4. discoides, Ziethen; A. respondens, Quenstedt; A. 
bicarinatus, Minster; A. angustatus, Bronn; with some doubtful 
species. Of Goniatites, only one species, the G. decoratus, from the 
