242 
Family— NUCLEOSPIEID^. 
Genus — ItJUTZIA, King, 1850. 
(Mon. Permian Foss. England, p. 137.) 
Eetzta eadtalis, Phillips, sp., PI. 11, figs. 24 and 25. 
Tcvcbvatitki vadktlis, Phillips, 111. Geol. Yorksli., lS3fi, Pt. 2, p. 223, t. 12, f. 40 and 41. 
Retzia radialis, Davidson, Mon. Brit. Carb. Bruch., 1300, Pt. 3, p. 87, t. 17, f. 19-21. 
Obs. Numerous e-Aamplcs of a small Bracliiopod, always in the form of casts, 
with a highly punctate structure, and radiating ribs, are to be met with in the Star 
Beds, usually compressed almost flat, and sometimes obliquely distorted. The radiating 
costae appear to be about fourteen or fifteen in number, angular, sharp, and prominent, 
which, with the valleys between, are densely sprinhled with rugosities representing the 
very fine punctations of the shell. 
The ribs ornamenting the valves are much too numerous for the Devonian Metzia 
ferita. Von Buch, and still more so for the Carboniferous K. ulotrix, De Koninck, in 
which there are only from seven to nine, and very prominent, giving a much bolder 
appearance than that possessed by the Corner Creek shell. It is with Retzia radialis, 
Phillips, that the greatest resemblance exists, both in size, number of the cost® (eleven 
to twenty-three), and probably also in shape. So far as I am aware, only one species 
of Retzia has hitherto been described from Australian rocks, and that a Silurian species, 
viz., B. Salieri, Davidson, by Prof. Do Koninck. The occurrence of another species in 
Korth Australia is therefore an interesting fact. 
Log. and Horizon. Corner Creek, Great Star River (if. L. Jach ) — Star Beds. 
Retzia ? hltmeren^is, sp. nov., PI. 11, figs. 20-22. 
Sp. Char. Shell elongately deltoid, attenuated or narrow towards the beaks, and 
expanded towards the front ; valves equally convex at a point drawn through them 
immediately below the beak of the dorsal valve, thence rapidly decreasing towards the 
front margin, which is very wedge-like ; umbo of the ventral valve moderately large 
(its apex broken), and probably overhanging that of the dorsal valve but little; surface 
of both valves covered with close, equal, simple and rounded costse, [shell structure 
punctate ?]. 
Obs. The reference of this shell to Betzia is provisional only, the nature of the 
interior being quite unknown. It possesses much the outward appearance of a Betzidt 
but repeated and close examination has quite failed to detect perforation of the shelly 
matter with any degree of certainty. 
In form, B. ? lilymerensis is very like some of the genera figured by Dr. W- 
"Waagen from the Pimduetus Limestone of the Salt Range, Hindostan, such, for instance, 
as Hetnipty china, Waagen,* and Dielasmina and Notothyris, Waagen,t but without 
possessing the forward plicm or ribs of these genera. Could I have satisfactorily shown 
the presence of a punctate shell structure in the present species, it might very justifiably 
have been referred to Dielasmina, as the three septal plates visible on the uinboual 
surface of the dorsal valve, in both shells, closely correspond. Although the Australm^ 
shell is not coarsely plicate, it bears a large number of smaller eostse, which certainly <1° 
become larger and coarser towards the front margin, after the manner of Waagen s 
genus. 
* Pal. Indica (Salt Kange Fossils), 1882, Ser. xiii., Vol. i., No. 4, fasc. 1, p. 361. 
+ im., p. 359. 
