54 Transactions of the Boyal Society of South Africa. 
The most perfect of the specimens is an upper valve which, in 
conjunction with some fragmentary lower or more convex valves, 
appears to be referable to a smooth form of JExogyra having possible 
affinities with E. sinuata, J. Sowerby { = Ostrea aquila, Orbigny) 
which ranges from Barremian to Albian. The European species is, 
however, usually much wider and of more ponderous development 
than the present form, and is also prominently ridged. The valves 
from Zululand, which may represent only one species, are distinctly 
of different periods of growth, their height varying from 35 to 
77 mm., the youngest being of quite a thin structure. It is their 
smoothness, exogyriform character, and lamellose structure which 
suggests a Lower Cretaceous type, such as E. sinuata, as their 
nearest grouping, which, if correct, would be in favour of a Lower 
Cretaceous age for the shells, more especially when it is remembered 
that the more ornamental forms of this genus, like flabellata, 
africana, olisi-ponensis , suhorhiculata, &c., which are frequently 
found in Northern Africa (Egypt, &c.) belong to Upper Cretaceous 
horizons, chiefly Cenomanian. The valves were found associated 
with Gervillia sublanceolata. 
Locality. — North end of Ealse Bay. 
EXOGYRA cf. FLABELLATA, GoldfuSS. 
Plate 11. , figs. 6, 7. 
Exogyra flabellata, Goldfuss, Petrefacta Germanise, 1833, vol. 2, 
pi. 87, fig. 6, p. 38. 
Description. — Shell small, oval, and with strongly incurved um- 
bones ; upper valve fiat, operculiform, obscurely plicated, and covered 
with concentric lines of growth ; lower valve posteriorly deep, 
rounded, ornamented with concentric growth-lines and moderately 
thick plications ; adherent surface in front, well excavated. 
Dimensions. — 
Length 15 mm. 
Height 19 „ 
Depth of lower valve 11 ,, 
Observations. — This small shell is in fair preservation, having both 
its valves united and closed, and still showing certain parts of the testi- 
ferous structure. The lower valve has a few well-marked nearly 
equidistant plications crossing the concentric growth-lines, and a 
similar ornamentation is seen on the operculiform upper valve, 
although the radial plications are much more obscure. The surface 
of the internal ventral margin of the lower valve is exposed for a 
short distance through the slightly smaller size of the other proving 
it to be excavated and radially striated. 
