Cretaceous Gastropoda, and Pelecypoda from Zululand. 45 
which appears to terminate on the posterior margin in a kind of 
notch or opening, and such a feature is plainly seen in Stoliczka's 
figure. There is, however, a difference between the Indian and 
African shells which should be mentioned, and that is in connection 
with the convexity of the valves. Unfortunately Stoliczka gives no 
measurements of his species, but states that the valves are very 
compressed or gently convex — " valvis aut compressiiLsculis aut 
le7ite convexis." The African fossil is, however, well arched in 
the centre, although rather compressed at the sides, so that the 
valves would be accurately regarded as fairly convex ; the outline 
figure given of the posterior end will help to explain this point 
so far as the African shell is concerned, but unfortunately there 
is no corresponding figure in Stoliczka's memoir to confirm this 
part of his original description. 
Dimensions. — 
Length 145 mm. 
Height 80 „ 
Diameter 52 ,, 
The matrix is a heavy dark grey limestone, showing minute black 
chloritic grains, and containing a fragmentary example of a small 
Baculites (see p. 96), and being therefore lithologically and 
palseontologically exactly similar to the rock, with the deep cavity 
representing a specimen of Inoceramus expansus of Baily, to be 
subsequently referred to. 
Locality. — Umkwelane Hill. 
Genus INOCEEAMUS, J. Parkinson, 1819. 
Trans. Geological Society [London] , 1819, vol. 5, part 1, p. 55, 
pl. 1, fig. 3. 
Inoceramus choffati, sp. nov. 
Plate III., figs. 11, 12. 
Description. — Shell sub-quadrate, small, antero-medianly arched 
from umbo ; anterior side long, nearly vertical, deep ; posterior 
surface sloping gradually to the margin ; hinge margin horizontal, 
elongate ; umbo anterior, short, small, incurved ; ornamentation 
consisting of a regular series of depressed, concentric ridges, sepa- 
rated by smooth shallow suications, which widen gradually in the 
ventral direction ; ventral margin rounded. 
Dimensions (right valve). — 
Length 35 mm. 
Height 35 „ 
Diameter 9 ,, 
