100 Prof. T. Rupert Jones — Fossil Bivalved Entomostraca. 



known series of Elephant and other vertebrate remains obtained by 

 the Eev. J. Layton, from the eastern coast cliffs, and from the beach 

 and the celebrated oyster bank lying off Happisburgh. Most of the 

 objects in this collection are also referable to the Forest-bed period. 

 The celebrated Norfolk coast " Forest-bed " collection, made by 

 the Eev. John Gunn, F.G.S., now forms a part of the Norwich 

 Museum, where the geological collection of the late Mr. Samuel 

 Woodward is also preserved. 



II. — Notes on some Fossil Bivalved Entomostraca. 



By Prof. T. Eupert Jones, F.R.S., F.G.S. 

 (PLATE III.) 



Introduction. — Notes and references accumulating for some years 

 have induced me to offer some remarks on a new fossil Estheria, 

 and on some already known, of Carboniferous, of Permian, and of 

 Triassic age ; also a description of some fossil Ostracoda from the 

 Ironstone of Shotover, near Oxford, involving remarks on all the 

 known Wealden species ; and lastly notes on some species found in 

 the Purbeck strata of the Subwealden Boring, near Battle, in 

 Sussex. 



The specimens shown in Plate III. are illustrated under favour of 

 a Grant from the Eoyal Society for the purpose of figuring the fossil 

 Bivalved Entomostraca. 



I. An Estheria from the Karoo Formation, near Cradoclc, Cape 

 Colony. South Africa. 



Estheria Greyii, sp. nov. Plate III. Fig. 1. 



Valves almost elliptical, except that the dorsal is less convex than 

 the ventral edge, and the dorsal angles are strongly pronounced. 

 The antero-dorsal angle points forward, and is rather low down. 

 The umbo is just within the anterior third of the valve. Of the 

 numerous concentric ridges, those nearest the ventral margin are 

 small and close-set; about twelve larger ridges, wide-apart, mark 

 the middle and more convex surface of the valves. No sculptured 

 or pitted ornamentation is observable. Eadiating wrinkles of the 

 shell, under pressure, as shown in the drawing, are not un- 

 common. Length |- inch ; height -jV inch. Fig. 1 shows a right 

 valve ; magnified twelve diameters. 



Numerous more or less flattened valves occur on the bed-planes 

 of a hard dark-grey shale,, from the Karoo Formation near Cradock, 

 in South Africa. The specimens were found by the late Dr. 

 George Grey, when " excavating the shales to examine if they 

 would yield roofing material"; see Quart. Journ. Geol. Soc. vol. 

 xxvii. (1871), pp. 49 and 50. Specimens are in the Geological 

 Society's Museum and my own Collection. 



These little fossils^ are interesting as giving some support to the 



I Estheria and its congener the Limnadia received much elucidation at the hands 

 of Prof. E. Grube, of Breslau, in his memoir " Ueber die Gattungen Estheria und 

 Limnadia," etc., in the Archiv fiir Naturgeschichte, Jahrgang xxxi. 1865. 



