183 
THE CAMBRIAN FOSSILS OF SOUTH AUSTRALIA. 
By Proressor R. Tarte, F.G.8., F.L.S. 
[Read September 6, 1892. ] 
Plate IT. 
The history of the discovery of Cambrian rocks in our Pro- 
vince is briefly and succinctly given by Mr. Etheridge (Trans. 
Roy. Soc. 8. Aust., vol. XIITI., p. 10, 1890) in an introduction to 
his paper descriptive of some corals obtained from this horizon. 
During the past two years additional paleontological discoveries 
have been made at Parara and Curramulka, on Yorke-Peninsula; 
and as a fairly representative fauna of the Lower Cambrian or 
Olenellus-zone has now been obtained ; it is highly desirable that 
it should be publicly recorded. At least twenty-three determinable 
species have been elaborated; whilst various obscure fossils, 
whose zoological relations cannot be interpreted, represent some 
four or five ‘additional ones. 
The fossils are in an excellent condition, their tests being in all 
cases well preserved ; but the absence of a bold outcrop, or face 
of stone, and the want of bedding planes in the rock reduce 
fossil-collecting to the level of the labourer who breaks stones for 
road-metal. The difficulty of obtaining complete specimens, or 
in relief on the stone, is obviously very great ; whilst the intract- 
able nature of the matrix does not permit of developing the 
fossils. The location of those genera, whose essential characters 
are internal, is guess-work, because in no instance have interior 
aspects or casts been obtained. 
The following list contains all the definable elements of our 
Cambrian fauna. The note on the occurrence of Hyalostelia is 
by Mr. W. Howchin, F.G.S8. 
GASTROPODA. 
Stenotheea rugosa, Hall. Plate ii., fig. 4. 
Ref.—Walcott, American Jour. Sc., 1887, t. 1, fig. 11. 
Stenotheca rugosa, var. paupera, Shaler and Foerste, Bull. 
Mus. Comp. Zool., 1888, p. 29, t. 1, fig. 9. 
Stenotheca ? rugose (Hall), Walcott, Tenth Annual Report 
U. States Geol. Surv., 1890, p. 617, t. 74, ne 1. 
All of the few examples of this species, obtained at Ardrossan, 
are referrable to the variety paupera. 
