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GEOLOGICAL MEMOIRS. 



therefore hard, and extremely rich in small, mostly crushed shells, 

 which have usually the appearance of having been calcined. The 

 fossils, as far as their condition allows of determination, are : — of 

 Molluscs, Bentalium, Turrit ella, Ostrea, Nucula, and probably a 

 small Astarte ; of Echinoderms, a Cidarites, of which, however, I 

 found only one spine, covered with small granulations. On these 

 fossiliferous beds, as on the Zwartkops River, lies a light, friable, grey 

 sandstone, 20 feet thick, in which there are not any fossils, al- 

 ternating with beds (one foot thick) of a reddish-grey, rather heavy 

 rock, frequently dividing into nodules, that I took for Sphserosiderite. 

 Of the great Ammonites and remarkable Hamites, mentioned by 

 Hausmann *, I have nowhere found a trace; perhaps they occur in 

 the neighbourhood of the Zondag River. This formation does not 

 appear to extend further to the east of this river, since the hills in the 

 vicinity have altogether the form of the other sandstone hills of the 

 colony, and the high ground between the Zwartkops and the Koega 

 Rivers, the Tweekoppen, is really occupied, as I have convinced my- 

 self, by the usual quartzose variegated sandstone. 



In describing this peculiar district I must allude to the fact, that 

 on the Grass Ruggens, near the Zondag River, is the Schulpen-gat 

 [Shell-pit], already referred to by Hausmann and by myself at Ma- 

 yence ; here, under a bed of white marine limestone, scarcely half a 

 foot thick, is a deposit of innumerable Oyster-shells, which the co- 

 lonists use for lime-burning : and also to the existence on the right 

 bank of the Koega River, about four leagues from Uitenhage, of a 

 remarkably carbonated chalybeate spring, of 31° C, a detailed account 

 of which I gave in Leonhard and Bronn's Jahrb. f. Min. &c, 1843, 

 p. 161. 



A description follows of nine species of Molluscs. The new genus 

 Anoplomya is described as having the form of a Lutraria, but 

 without hinge-teeth ; it is grouped with the Myacea, and thus cha- 

 racterized : — 



Testa transversa, incequilateralis, cequivalvis, Mans. Denies nulli. 

 Margo cardinalis tenuis {non callosus), biplicatus, inter marginem 

 umbonesque foveolatus. Vmbones a margine cardinali distantes. 

 Ligamentum externum. 



The author gives figures of the following : — 



Anoplomya lutraria, nov. gen. sp. Lyrodon Herzogii, Hausm., Goldf. 

 Astarte Herzogii, Krauss. conocardiiformis, n. sp. 



Cytherea Herzogii, Hausm. ventricosus, n. sp. 



Astarte Capensis, Krauss, 1843. Gervillia dentata, n. sp. 



Astarte Bronnii, n. sp. Exogyra imbricata, n. sp. 



Cucullsea cancellata, n. sp. 



[T. R. J.] 



* Gotting. gelehrt. Anzeig. 1837, p. 1449. [Mr. Bain mentions the finding of 

 an Ammonite {Am. planatus ?) in situ on the summit of the Spitzkop (loc. cit. 

 p. 57), near Graaff Reinet and N.N.W. of Uitenhage. Some specimens of Am- 

 monites and Nautili (accompanied by two or more species of Lyrodon and other 

 fossils), from the neighbourhood of the Sunday River, were presented in 1849 to 

 the Geological Society of London by Dr. Atherstone. — Transl.] 



