78 
Transactions of the Boyal Society of South Africa. 
Syria. — Cenomanian and Senonian (Lartet and Blanckenhorn). 
Egypt (Libyan Desert). — Overwegischichten = Danian (Quaas). 
Tunis. — Albian and Cenomanian (Peron) ; Senonian (Pervin- 
quiere). 
Constantine. — Cenomanian (Coquand). 
Natal. — Izinhluzabalungu deposits (Griesbach) = Campanian. 
Zululand. — Umkwelane Hill deposit (E. Etheridge, jun). 
India (Southern). — Trichinopoly Group (Stoliczka). 
Locality. — Tributaries of the Manuan Creek. 
Family PHOLADOMYID^. 
Genus PHOLADOMYA, G. B. Sowerby, 1824. 
The Genera of Eecent and Fossil Shells, 1824, No. xix., pi. 37. 
Pholadomya luynesi, Lartet. 
Plate VI., figs. 1, 2. 
Pholadomya luynesi, Lartet, Exploration Geol. de La Mer Morte, 
&c., 1877, pi. xi., figs. 7, 8, p. 125 ; Blanckenhorn, Beitr. Geol. 
Syriens, 1890, p. 95. 
Observations. — This is an interesting form of Pholadomya, since it 
differs in possessing a concentric ornamentation without the addi- 
tional radial striations, so essential a part of the characteristic 
sculpture of that genus. 
The specimen from Zululand, and there is only one, is in a fair 
state of preservation so far as external characters are concerned, 
both valves being in situ and closed, the posterior end exhibiting a 
gape. The valves are medianly inflated and furnished with anterior, 
incurved, contiguous umbones ; their contour is elongately oval, 
with short rounded anterior regions and long posterior areas, whilst 
the cardinal line is horizontal and sub-parallel with the curved ventral 
border. The lunule is not distinct, as slight crushing of the valves 
has taken place beneath the umbones, but in the rear a moderately 
deep and narrow escutcheon area is present. Fragments of shell 
structure are still adherent to the specimen, proving it to be 
extremely thin, the ornamentation showing rugose and finer 
concentric striations. 
Dimens ions . — 
Zululand Type Specimen from 
Specimen. Holy Laud. 
Length 84 45 mm. 
Height 19 25 „ 
Diameter 16 25 ,, 
