322 Heports and Proceedings — 



out here and there in the gorges at the foot of the Eandt, and consist of metamorphic 

 rocks, greatly denuded, ou which the massive and extensive siliceo-calcareous strata of 

 the Great Camphell Plateau lie unconformably. These latter and the breccias of 

 their slopes are coated thickly with enormous travertine deposits. Beyond the 

 Plateau, at Griquatown, a long parallel range of jaspideous rocks comes out from 

 beneath the Campbell Plateau, and present a wonderful group of yellow, brown, 

 chocolate and red jaspers, with magnetic and other ironstone, and beautiful seams of 

 blue and yellow crocidolite. The southern portion of this range has long been known 

 as the "Asbestos Mountains" and the "Doornberg." Igneous rock-masses occur 

 around Ongeluk, west of the Jasper range, and then bright-red jasper rocks crop up 

 near Matsap, succeeded to the west by the parallel quartzite range of Matskp, and 

 again by other bedded jaspers, which seem to lie in a synclinal of the quartzite rocks, 

 which come up again in the Langeberg. These are succeeded by lower rocks, con- 

 sisting largely of sandstone, grit, and quartzite, with more or less pervading mica, as 

 far as the journey extended in the Schurwe Bergen, also parallel to the former ranges. 

 The maximum thickness of the successive strata is calculated by the author at 24,000 

 feet ; allowing for possible reduplications, the minimum is regarded as not less than 

 9000 feet. The details of stratification, successive upheavals, denudation, nature, 

 and origin of the salt-pans, escarpments, river-valleys, and other features, were treated 

 of by the author, who has supplied a very large collection of specimens illustrative 

 of the phenomena observed in the line of march, and of his numerous sections, maps, 

 and sketches. 



Discussion.— Vrot Hull suggested making thin slices from the limestone with a 

 view to microscopic examination, and offered to carry out this suggestion. 



Prof. Hughes observed that by burning a limestone and suddenly plunging it in 

 water, fossils previously invisible were sometimes manifested. 



Prof. Eupert Jones pointed out some interesting lithological characters in some of 

 the micaceous, jaspideous, and other rocks sent by Mr. Stow. 



3. " On some Bivalve Entomostraca, chiefly Cypridinidse, of the Carboniferous 

 Formations." By Prof. T. Rupert Jones, F.R.S., F.G.S. 



The larger forms of bivalved Entomostraca are not rare in the Carboniferous 

 Limestone, and some occur in certain shales of the Coal-measures. Professors 

 Phillips, M'Coy, and De Koninck have figured and described some specimens. The 

 collections made by M. J. Bosquet, F.C.G.S. (Belgium), Mr. Joseph Wright, F.G.S. 

 (Cork, Ireland), and Mr. J. H. Burrow, M.A. (Settle, Yorkshire), and submitted to 

 the atithor and his friend Mr. J. W. Kirkby, have elucidated many obscure points in 

 the history of these old Entomostraca. Other specimens from Scotland, Yorkshire, 

 Derbyshire, and the Isle of Man, communicated by many friends, were treated of in 

 this paper. 



The Untomoconchus of M'Coy proves to have the Cypridinal characters of anterior 

 sinus and gape ; and, besides H. Scoideri, at least two species have been determined. 

 A very closely related genus, Offa, has also been indicated. M'Coy's " Baphnia 

 primceva" belongs to OijpricUna proper ; and twelve other Carboniferous species have 

 been established. A modified form of carapace, without any exact modern analogue, 

 characterizes the new genus Cypridinella, with seven species. De Koninck's genus 

 CyprideUa (restricted) has seven species ; and a form intermediate to this and Cypri- 

 dina is described as Cypridellina, with eight species. Siclcima (with two species) is 

 an exaggerated modification of CyprideUa. Cijprella of De Koninck (restricted) has 

 two species. The recent Bradycinctus, Sars, and PMlomedes, Lilljeborg, appear to 

 have their prototypes in the Carboniferous Limestone, with one species each. Rhom- 

 hina, a new genus, is a less easily recognized Cypridinal form, with an Irish and a 

 Belgian species. 



The recent Polycope, Sars, belonging to a difi'erent family, and represented by three 

 Carboniferous species, was the last described in the memoir ; but Cytherella, belong- 

 ino- to an allied group, is known in the Mountain-limestone and Coal-measures ; and 

 Leperditia, Pntomis, Beyrichia, Kirkbya, and other Palasozoic genera, abound, to- 

 gether with forms referable probably to Cythere, Cyp)ris, Candona^ etc., which will be 

 treated of in a future paper. 



Discussion. — Mr. Gwyn Jeffreys inquired as to the greatest depth at which recent 

 marine Entomostraca had occurred. So far as he knew, they were abundant in the 

 Littoral and Laminarian zones, and very scarce in the Coralline. He was not aware 

 of their occurrence at a great depth. 



