4 GEOLOGICAL MEMOIRS. 



nifera, among which an elongated Spiroliniform Peneroplis is par- 

 ticularly abundant. A species nearly allied to P. planatus, Ficht. 

 & Moll., occurs more sparingly. Associated with these Foramini- 

 fera is a finely striated Anomia, most nearly approaching A. tenui- 

 striata, Desh. The horizon of the bed in which these fossils occur, 

 near Divaea, is that of the lowest Foraminifera-beds of the Libur- 

 nian stage, lying immediately upon the uppermost Rudista-zone. 

 The author remarks on the occurrence of Peneroplis so low down in 

 the Eocene series. 



2. A pale grey limestone, also very rich in Foraminifera, belong- 

 ing to the uppermost division of the Rudista-limestones, above the 

 rich Hippurite bed of Valresina. In this a large globular Forami- 

 nifer (10-12 mill, in diameter) occurs, and is rendered very con- 

 spicuous by the contrast of its white shell with the grey Limestone. 

 A section of this form shows nearly the structure of Orbitidites. 

 The surface of each layer presents extremely fine convoluted ridges, 

 resembling those described by Carpenter on the exterior of Parheria. 

 The author considers that there are sufficient grounds for forming a 

 new genus for this Foraminifer, in the form and arrangement of the 

 chambers, in which it approaches Orbitidites, and in the chemical 

 constitution of the shell, which is entirely calcareous. 



3. A thinly laminated calcareous shale in the neighbourhood of 

 Sopra Cossi, near Albona, in Southern Istria, belonging to the Upper 

 Rudista-limestones, but containing Ophiurida and plants resembling 

 those of the lithographic stone of Solenhofen. 



4. A deposit in the southernmost part of Istria, from which an 

 Ammonite, nearly approaching A. cenomanensis, dArch., has been 

 obtained. This seems to indicate the occurrence of Lower Turonian 

 or Upper Cenomanian deposits in Istria. [~W. S. D.] 



7. Dolomitic Pseudomoephs of Garnet. By Dr. G. Latxbe. 



[Proc. Imp. Geol. Inst. Vienna, January 7, 1873.] 



The dolomitic veins which traverse the veins of haematite in the Red 

 Wall near Orpus, in the Erzgebirge, contain amygdaloid portions, 

 consisting of a nucleus of dolomite and an envelope of haematite. 

 The haematite envelope is finely fibrous, and encloses a sharp-angled, 

 smooth-faced nucleus of drusy dolomite, the cystalline form being that 

 of garnet. The process of formation was therefore as follows : 

 crystals of garnet were first enveloped by haematite, then decom- 

 posed and carried off, leaving behind them a regular space, which 

 was afterwards filled with dolomite. [Count M.] 



8. Red Anttmonto-sulphide of Silver. By M. Karl Rextt. 

 [Proc. Imp. Geol. Inst. Yienna, January 21, 1873.] 



This mineral (rhombohedral ruby-blende of Mohs) has lately been 

 found abundantly at Joachimsthal, North Bohemia, accompanying a 

 vein of white calc-spar enclosed in fine-grained mica-schist. Ar- 



