Cretaceous Gastropoda, and Pelecypoda from Zididand. 35 
mentation — entierement lisse — a distinction which would suggest 
that the present African shell should be regarded under another 
name. It may be mentioned, however, that French examples of 
this species in the British Museum from the typical Cenomanian 
locality of Le Mans, Sarthe, exhibit this radial sculpture, making it 
possible that the original specimens were badly preserved or had not 
been sufficiently examined. In all other respects there is a close 
connection between the present shells from Zululand and the 
French species, especially when the angularity of the vidves is 
considered together with their great convexity. The dentition of 
the African valves also agrees in every respect with that figured by 
Orbigny. 
The species has been recorded by Hamlin and Blanckenhorn 
from Syria, the latter recognising it as of Cenomanian age. Syrian 
examples consist largely of internal casts, and have been figured by 
Conrad as Area indurata (Lynch' s Official Eeport United States 
Expedition, Dead Sea, &c., 1852, pi. 5, fig. 33, p. 216), a species 
regarded by Blanckenhorn as part of the synonymy of A. ligeriensis. 
Similarly, casts from the Turonian of Egypt have been figured and 
described by Dr. Edg. Dacque as resembling fig. 4 of Orbigny's 
plate 317, which, however, was subsequently (see synonymy) 
removed from that species by Orbigny himself. Stoliczka has also 
referred to the French species, not as occurring in India but as a 
member of the European Cretaceous fauna, this author regarding 
the shell, probably fo^ the first time in literature, as belonging to 
Conrad's genus Trigonarca.''- 
Mr. H. Woods does not acknowledge the presence of T. ligeriensis 
in British rocks unless it may prove to be identical with T. passyana 
of Orbigny, also a Cenomanian shell, found at English localities, and 
which is particularly characteristic of the Eouen deposits (Cretaceous 
Lamellibranchia, England, Mon. Pal. Soc., 1899, p. 47). 
Locality. — North end of False Bay. 
Trigonarca sp. 
Plate IV., figs. 10-12. 
Ohservations. — The specimen here referred to consists of a single 
left valve, of evidently adult growth, being structurally very robust 
and thick and much worn. In contour it is elongately triangular, 
convex, and furnished with an obliquely abrupt, deep, nearly vertical 
posterior side, besides having a similarly deep, vertical face to the 
* Founded in 1862 {Proc. Acad. Nat. Sci., Philadelphia, No. v., p. 289) on the 
type of Cucullcea maconemi)^, Conrad {Journ. Acad. Nat. Sci., Philadelphia, I860, 
Ser. 2, vol. 4, pi. 47, fig. 20, p. 28). Genus essentially Cretaceous. 
