108 PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND. 
Description: Carapace medium-sized, in lateral view narrowly 
elongate, highest at about or slightly behind middle. Height consider- 
ably less than one-half of length. Dorsal margin very gently arched. 
Ventral margin almost straight, to slightly concave in median region. 
Dorsal and ventral margins tending to become nearly parallel. Anterior 
extremity rather subacutely rounded, somewhat truncated dorsally. 
Posterior extremity more evenly rounded. Valves only moderately 
convex. Convexity fairly regular, with position of greatest thickness of 
carapace located slightly behind middle. Valves subequal, left slightly 
overlapping right along ventral margin and two extremities. In profile 
narrow oblong-ovate. Surface of valves polished, smooth, and unoma- 
mented. Shell of medium thickness, brittle, chitino-calcareous, white,, 
and translucent to opaque. 
Dimensions of holotype: Length, 1-76 mm.; height, 0-75 mm.; 
approximate thickness of carapace, 0-65 mm. 
Remarks: This ostracod compares fairly closely in both shape and 
size with certain species of S'lenocypris , but does not appear to be 
identical with any previously described form. It is apparent that this 
is the ostracod which Chapman in 1985 (p. 70) tentatively determined as 
cf. Paradox o stoma sp. Unfortunately, he had at his disposal only one 
small sample of ostracod-bearing shale from the Baffle Creek Tertiaries, 
and almost all the valves it contained were particularly badly crushed. 
Furthermore, since, in its outline, this ostracod does show some general 
resemblance to Paradoxostoma Fischer, it is perhaps not surprising that 
Chapman tentatively compared it with that littoral, marine genus. 
This species has been found to be quite common in the Baffle Creek 
ostracod-bearing shale, and it has also been recognised in the Redbank 
Plains material. Very few complete, undamaged valves have been found, 
apparently because of the brittleness of the shell and the fact that all 
the material has been very crushed. Although slight variations in 
outline have been observed, the ratio of height to length for most 
individuals has been found to be 41 :100. Some indication of a marginal 
zone traversed by radial pore canals has been observed around the 
anterior extremity of several valves. It is possible, moreover, that the 
apparent absence of a marginal zone from most valves may be the result 
of the brittle nature of the shell and consequent breaking, especially 
around the free edges of the valves. The species has been named after 
the township of Lowmead in the Baffle Creek Tertiaries near where it 
was found. One recent species of this genus has been recorded by Sars 
(1889) from lagoons near Rockhampton. 
Localities and Age: In the Baffle Creek Tertiaries: From No. 2 
Shaft, portion 30, parish of Warro, county of Flinders, near Lowmead, 
between Bundaberg and Gladstone ; from various depths in the Lowmead 
No. 1 Bore, in the N.W. corner of the abovQ portion. In the Redbank 
Plains Series: Gully on portions 118, 119, 120, parish of Bundamba, 
county of Stanley, approximately 5 miles S. of Goodna, between 
Brisbane and Ipswich. Probably Oligocene. 
