142 NEWTON: CRETACEOUS CONCHOLOGY OF S. AFRICA. 
Dr. Atherstone and A. G. Bain made further discoveries of 
molluscan remains from the strata skirting the Sunday and 
Zwartkop rivers which were fully described and figured by 
Daniel Sharpe? in 1856. 
In opposition to the previous views of Hausmann and 
Krauss they were assigned to a Jurassic age. 
The following were the shells described, names without 
authors representing the new species :— 
CEPHALOPODA. 
Ammonites Atherstonet Ammonites Batnt 
GASTROPODA. 
Acton ? undetermined Natica, undetermined 
Action Atherstonet Neritopsts ? turbinata 
Ampullaria ? undetermined Trochus Baint 
Cylindrites ? undetermined Turbo Atherstonet 
Natica Atherstonet Turbo Baint 
LAMELLIBRANCHIATA. 
Arca Atherstonet Modiola Baint 
Avicula Baint Myacites ? Batnt 
Ceromya papyracea Perna Atherstonet 
Cyprina rugulosa Pholadomya dominicalis 
Cyprina? Baint Pinna Atherstonet 
Gastrochena dominicalts Psammobia Atherstonet 
Gryphea (Exogyra) imbricata  Sanguinolaria ? africana 
Krauss Trigonia vau 
Modiola Atherstonet 
In 1867 Mr. Ralph Tate? in a comprehensive paper on South 
African fossils described and figured a number of shells from the 
Uitenhage district (Sunday and Zwartkop rivers, &c.), which he 
regarded as Jurassic. He designated the rocks containing them 
the “ Uitenhage Formation.” The following species were deter- 
mined ; those without authors being new :— 
t Description of Fossils from the Secondary Rocks of Sunday and Zwartkop rivers, South 
Africa, collected by Dr. Atherstone, and A. G. Bain, Esq. Tvans. Geol. Soc. 
London, 1856, vol. vii., pls. xxii. and xxiii., pp. 193-202. 
2 On some Secondary Fossils from South Africa. Quart. Journ. Geol. Soc. 1867, vol. 
Xxlii., pls. 7-9, pp. 149-175. 
J.C., viii., Jan. 1896. 
