Cretaceous Gastropoda, and Pelecypoda from Zululand. 53 
The largest lower valve of the Manuan Creek specimens shows the 
following dimensions : — 
Length 25 mm. 
Height 15 
Diameter 15 
The specimens from the north end of False Bay consist of isolated 
lower valves unconnected with matrix, belonging to young shells in 
different stages of growth. Internal characters are well developed, 
and even the sub-marginal denticles can be seen in some of the 
valves. These examples, like those from the Manuan Eiver dis- 
trict, share a close resemblance with the Albian forms from England, 
as they occur at Blackdown, in Devonshire. 
The largest lower valve from the north end of False Bay has the 
following dimensions : — 
Length 38 mm. 
Height 20 
Diameter 15 
The species appears to belong to the Upper Albian and Cenomanian 
stages of the Cretaceous period, having been recorded from Folke- 
stone, Blackdown, Chute, Ireland, &c., in the British Islands ; from 
numerous localities in Europe (France, Spain, Southern Italy, &c.), 
and from Northern Africa (Tunis and Algeria) ; it is apparently 
unknown either in Syria or India. 
Localities. — Tributaries of the Manuan Creek, and north end of 
False Bay. 
EXOGYRA, sp. 
Plate IL, figs. 11, 12. 
Description. — Shell mostly of oblong form, with a smooth, lamel- 
lose external surface, and a large postero-medianly situated adductor 
scar impression. The upper valve is depressed, shallow, furnished 
with a posteriorly curved umbonal region, exogyriform ; beneath 
the umbo extends a well-excavated margin curving outwards in its 
central part to circumscribe the ventral area ; the anterior margin 
curves slightly outwards and may be said to be sub-parallel with 
the opposite border. The lower valve is thickest and most concave 
and its lateral margins are more or less parallel. 
Dimensions (upper valve). — 
Length 47 mm. 
Height 77 ,, 
Observations. — This description is drawn up from some isolated 
ostroeiform valves which are not capable of specific determination on 
account of belonging to different individuals which cannot be paired. 
