OSTRACODS FROM SOME QUEENSLAND TERTIARY BASINS. 99 
given only unsatisfactory accounts of the structure of the carapace 
valves. In the case of fossil specimens, the shell is all that remains, 
and it is on the basis of its structures alone that the palaeontologist 
must make his determinations. Unfortunately, it is a fact that several 
ostracods with shells having essentially the same outline and surface 
characters have been described by zoologists as distinct genera. 
A final disadvantage is the fact that, although the ostracod faunas 
appear to bear a general resemblance to the present-day one, little work 
has yet been carried out on the recent freshwater ostracods of Queens- 
land. Accordingly, it is impossible at present to make any definite 
comparisons with the existing forms, quite apart from the fact that an 
element of doubt will always remain in such comparisons. 
In spite of the above limitations, however, the Queensland Tertiary 
ostracods are definitely valuable. In fact, after the Foraminifera, the 
Ostrocoda are now recognised throughout the world as the next most 
economically important group of microfossils found in sedimentary 
rocks. 
PART II.— SYSTEMATIC DESCRIPTIONS. 
In the following systematic descriptions Rupert Jones’ rule has been 
followed, where conclusive evidence is lacking, in regarding the thicker, 
or blunter, end of the carapace as the posterior extremity. Since the 
generic diagnoses are not readily available, they have been included. 
Order OSTRACODA Latreille. 
Suborder Podocopa Sars. 
Family CYPRIDAE Baird, 1846. 
Genus Cypris Muller, 1785. 
Genotype: Cypris piibera Muller, 1785, p. 56. 
Diagnosis: Carapace in lateral view reniform to oval. Dorsal margin 
variously arched. Ventral margin often sinuate, central portion usually 
somewhat incurved. Valves subequal, left valve usually the larger. 
Plinge edentulous, somewhat thickened, occupying about one-third dorsal 
margin. Surface of valves smooth to slightly uneven, often punctate. 
Range: Jurassic to Recent, mainly Tertiary to Recent. 
Cypris munduranensis, sp. nov. Plate VI, figs. 1 a, b. 
Holotype: F. 1976, Queensland Geological Survey Collection. 
Locality: Bore 4, at 170 feet. Parish of Targinie, County of Deas 
Thompson, between Gladstone and Rockhampton, Queensland. Geological 
Horizon: The Narrows Tertiaries. 
Description: Carapace small, in lateral view elongate-ovate to 
sub’reniform, highest slightly behind middle. Height slightly greater than 
one-half of length. Dorsal margin gently arched. Ventral margin nearly 
straight to slightly concave ' in median region. Anterior extremity 
somewhat obliquely rounded. Posterior extremity more broadly and 
evenly rounded. Valves moderately strongly convex. Convexity nearly 
uniform, but rising rather more steeply from ventral margin than from 
dorsal, and regularity interrupted by shallow transverse sulcus, crossing 
