Cretaceous Gastropoda, and Pelecypoda from Ziduland, 67 
smoothly margined form from Zululand. A number of Plicatulse 
have been recorded from the Cretaceous rocks of Southern India, 
Northern Africa, &c., but as a rule they possess a greater number of 
radial ribs, a more complicated structure, with frequently asperities, 
spines, or imbrications. In similar details it cannot be mistaken for 
P. andersoni from the Manuan Creek deposits described in the 
present memoir. The tubercles referred to as present on the 
internal face of this valve is a structure very seldom referred to 
in connection with the genus Plicatula, although they can be 
traced in some of the modern species. 
I wish here to convey my thanks to the artist, Mr. A. H. Searle, 
for pointing out this structure, which on a first examination was 
regarded as mineralogical, but which, from its regularity, is doubtless 
of an organic character. 
The specific name is in honour of A. W. Eogers, Esq., M.A., 
F.G.S., Director of the Geological Survey of Cape Colony, and 
author of a volume entitled, " An Introduction to the Geology 
of Cape Colony," published in 1905. 
Locality. — North end of False Bay. 
Family CYPEINID^. 
Genus VENIELLA, Stoliczka, 1871. 
Cretaceous Fauna Southern India ; The Pelecypoda, Pal. Indica, 
1871, p. 189 =Venilia, Morton, 1834, Synopsis Organic Eemains 
Cretaceous, United States, 1834, pi. 8, figs. 1, 2, p. 67 (pre- 
occupied). 
Veniella foebesiana, Stoliczka. 
Plate VII., figs. 1-4. 
Cyprina forbesiana, Stoliczka, Cretaceous Pelecypoda, Southern 
India, Pal. Indica, 1871, vol. 3, pi. 9, figs. 2-8, p. 197. 
Veniella forbesiana, F. B. Meek, Eeport on the Invertebrate 
Cretaceous and Tertiary Fossils of the Upper Missouri 
Country, United States Geol. Surv. Territories, 1876, vol. 9, 
p. 150 (reference only — species not found in America). 
Cyprina forbesiana, Peron, Desc. Mollusques, Cretaces, Explor. 
Scientif. Tunisie, 1891, pi. 29, figs. 4, 5, p. 295. 
Boudaireia forbesiayia, Pervinquiere : Etude Geologique Tunisie 
Centrale (Paris), 1903, p. 151. 
Boudaireia forbesi, Choflat, Nouvelles Donnees sur la zone Littorale 
d'Angola, Com. Service Geol. Portugal, 1905, pi. 1, fig. 3, p. 42. 
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