34 PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND. 
Occurrence. — Holotype (Comm. Pal. Coll. No. 267) : Kulnura Bore, 
parish Kooree, county Northumberland, New South Wales, at 3,894 feet, 
in black carbonaceous shales (Upper Marine Series). Also in Balmain 
Bore, City of Sydney, at 4,750 (Upper Marine Series). 
Cavellina kulnuraensis sp. nov. (PI. IY, Fig. 8.) 
Holotype—' Carapace medium sized, broad, inequivalved, dorsal 
margin slightly arched, anterior broadly rounded. Ventral margin 
slightly convex. Right valve slightly overlapping left at posterior 
ventral. Greatest width towards anterior dorsal. Height of valves equal 
in dorsal view\ there being variation in thickness from anterior to 
posterior end. Colour dark brown. Length, 1-69 mm. ; height, 0-99 mm. 
Observations. — This species is distinguished from C. lata Coryell 
from the Permian of Oklahoma, in the slightly arched shape of the dorsal 
margin towards the anterior end, the not so apparent overlapping of the 
right valve over the left, and in the almost uniform thickness of the 
carapace from anterior to posterior end. 
Occurrence. — Holotype (Comm. Pal. Coll. No. 268) : Kulnura Bore, 
parish Kooree, county Northumberland, New South Wales, at 3,865 feet 
in black carbonaceous shales (Upper Marine Series). Also at Pokolbin, 
Hunter River District (Lower Marine Series). 
Genus BASSLERELLA Kellett, 1935. 
Basslerella australae sp. nov. (PI. IY, Figs. 9a, b, 10.) 
Holotype. — Carapace large, stout, greatest thickness in central 
portion, subovate, broader at anterior end. Strong ridges along dorsal 
and ventral margins. Dorsal margin straight, very depressed, being 
more pronounced by dorsal ridges. Strong ridge along dorsal edge. 
Anterior margin slightly angulate with long angle towards ventral edge. 
Slight overlap of right valve over left at ventral end of angulated anterior 
portion. Surface smooth. Length, 1-49 mm. ; height, 0*97 mm. ; 
thickness, 0*74 mm. 
Paratype. — Left valve, showing strong dorsal margin and curved 
margin of ventral. Carapace broadest near anterior, gently tapering 
towards posterior, which is slightly pointed. Internal shape of left valve 
shows relationship with the Cytheridae. 
Observations. — This distinctive form is referred to the genus 
Basslerella Kellett, which ranges from the Pennsylvanian to the Permian. 
Kellett (1935) considers “that members of this genus are the direct 
ancestors of the Cytheridea.” This relationship is well illustrated in 
Fig. 10 of the present paper. The dorsal and ventral ridges in B. 
australae distinguish it from the described species. Several specimens 
are present in the Springsure material. 
Occurrence . — Holotype (Comm. Pal. Coll. No. 269) : Cattle Creek, 
14 miles S.E. of Springsure, Queensland, below waterfall (Lower Bowen 
Series). Paratype (Comm. Pal. Coll. No. 270) : Same locality. 
