OSTRACODS FROM SOME QUEENSLAND TERTIARY BASINS. 109 
'Genus Cypridopsis Brady, 1868. 
Genotype: Cypridopsis vidua (Muller), 1785. 
Diagnosis: Carapace in lateral view elliptical to strongly ovate and 
tumid. Height generally greater than one-half of length. Dorsal margin 
broadly to sharply arched. Ventral margin straight to gently sinuate. 
Valves subequal, right generally the larger, with greatest overlap in 
median portion of ventral margin. Hinge short, occupying about one- 
third dorsal margin, simple, valves separated by narrow, knife-edged 
slit. Surface of valves smooth to pitted. Muscle scars slightly 
anteroventral of median point, each scar rather elongated. 
Range: Permian to Recent. 
Cypridopsis linearis, sp. nov. Plate VI, fig. 6. 
Holotype: Ft. 1981, Queensland Geological Survey Collection. 
Locality : Bore 1, at 135 feet, parish of Rundle, county Deas Thompson, 
between Gladstone and Rockhampton, Queensland. Geological Horizon : 
The Narrows Tertiaries. 
Description: Carapace medium-sized, in lateral view arcuately and 
broadly ovate, highest slightly behind middle. Height greater than 
one-half of length. Dorsal margin strongly arched. Ventral margin 
slightly concave in median region. Anterior extremity well rounded, 
but somewhat truncated dorsally. Posterior extremity broadly 
and more bluntly rounded. Valves moderately strongly convex with 
convexity almost regular. Position of greatest thickness of carapace 
located slightly behind middle. Valves unequal, right overlapping left 
anteriorly, ventrally and posteriorly. Surface of valves wholly orna- 
mented with small flattened tubercles, generally arranged in rows. 
Tubercles circular to oval in outline, contiguous, and approximately 0-02 
to 0-03 mm. in diameter. Ornament somewhat draught-board-like in 
pattern. Rosette of five, subcentrally placed, muscle scars sometimes 
conspicuous. Shell thin, fragile, chitino-calcareous, and transparent to 
opaque. 
Dimensions of holotype : Length, 1-38 mm. ; height, 0*91 mm. ; 
approximate thickness of carapace, 0-75 mm. 
Remarks: The high, tumid shape of this ostracod is characteristic of 
the genus Cypridopsis. Although it compares closely in shape with 
certain species of this genus it appears to be distinct from all previously 
described species. 
It is not an abundant species in The Narrows material, but in some 
of the bore-core samples it has been found to be fairly common. Very 
few undamaged valves, however, have been found, and the above 
description is based in part on information obtained from fragments of 
the shell. The outstanding characteristic of this ostracod is the 
ornamentation. Some variation in outline within the species has been 
observed, which does not appear to be the result of crushing. While in 
most individuals the height nearly equals two-thirds of the length, in 
some cases it is only slightly greater than half the length. Variation in 
the ornament has also been noted. Although it generally shows a 
regular linear arrangement, in some individuals the ornament is much 
