72 PEOCEEDINGS OF THE GEOLOGICAI, SOCIETT. [DeC. 7, 



Fig. 5. Cerithium Jcaffrarium, n. sp. 



Figs. 6, 6 a. Solarium Wiebeli, n. sp., enlarged ; 6 b, natural size. 



Fig. 7. JPecten amapondensis, n. sp. 



Figs. 8, 8 a, 8 i. Fectunculus africanus, n. sp. 



Fig. 9. Astarte, sp. 



Figs. 10, 10 a, 10 b. Area capensis, n. sp. 



Figs. 11, 11 a, 11 b, 11 c. Trigonia STiepstonei, n. sp. 



Fig. 12. Cardium denticulatum, Baily. 



Fig. 13. Diadema, sp. 



Discussion. 



Prof. T. EtrpERT Jones commented on the importance of the 

 paper as throwing so complete a light on the geology of Natal, and 

 proving the geological sequence to be similar there to that in other 

 parts of Southern Africa. He remarked that the author had done 

 special service by the great increase of information furnished by 

 him regarding the Cretaceous rocks of Natal, and their equivalence 

 to those of India. He also pointed out that Mr. Griesbach had 

 proved that the Karoo formation was continuous to the other side 

 of the great dividing range, and formed the floor of the Orange 

 and "Waal valleys, and remarked that as Mr. Stow had indicated 

 glacial action on the south side of the Orange valley, it was quite 

 possible that the gravels containing the diamonds were of local 

 origin, as Dr. Grey had suggested. 



4. On the Diamond-districts of the Cape oe Good Hope. 

 By G. GiLPiLLAN, Esq. 



(Communicated by Warington W. Smyth, Esq., F.E.S., F.G.S.) 



[Abstract.] 



In this paper the author gave an account of a visit paid by him 

 in June last to the diamond-bearing districts of the Cape of Good 

 Hope. 



Between Cradock and Hope Town there seemed to be no indi- 

 cations to warrant the expectation of finding diamonds. The geolo- 

 gical structure of the country between Cradock and Middelburg is 

 very uniform, showing few traces of upheavals. The rocks are 

 chiefly sandstones of various degrees of fineness, with alternating 

 beds of red or blue marl, in hard nodules of which Dicynodon-xe- 

 mains are formed. 



On the " Karoo " the author noticed that all the springs in that 

 country rise on the eastern side of dykes which run about N.E. and 

 S.W. Near Hope Town there are immense tracts of sand. This 

 village is surrounded by low bluffs of a peculiar rocjk, consisting of 

 a calcareous matrix with waterwom pebbles. At Hope Town an 

 active trade in diamonds is carried on. 



The author crossed the Orange Eiver at Hope Town, and describes 

 the tract of country between that and the Vaal Eiver, called Albania, 

 as very barren of geological interest, being chiefly a sandy waste, 

 with a few low hills, dykes of greenstone, trap, &c., and occasionally 



