156 



Localities. — Common in the calciferous sandstone of the 

 River Murray Cliffs, near Morgan ; and in the older beds at 

 Muddy Creek, near Hamilton. 



Chione Cainozoica, Tenison-Woods. Plate xvi., figs. 3a — 36. 



Reference. — Proc. Roy. Soc, Tasmania, for 1876, p. 113. 



Suborbicular, inequilateral, globosely convex. Ornamented 

 with closely set, thin, concentric lamellae ; those on the middle 

 portion scarcely elevated ; more elevated on the front, and im- 

 bricating posteriorly. Umbones convex, much incurved, and 

 directed forwards ; lunule broadly heart- shaped, prominent, 

 and very distinctly circumscribed by a groove which interrupts 

 the concentric lamella?, the fine ends of which form the only 

 ornamentation of the lunule. 



The whole anterior and ventral margin finely crenulated. 

 Pallial sinus very short, narrowly triangular, apex acute. 



Dimensions. — Antero-posterior diameter, 22 ; umbo-ventral 

 diameter, 20 ; sectional diameter of closed valves at about a 

 third the length from the umbo, 14 millimetres. 



Localities. — Table Cape (B. M. Johnston /); lower beds at 

 Aldinga and Adelaide bore ; middle Murravian beds near 

 Morgan and Nine-mile Camp ; lower beds at Muddy Creek 

 clays at Schnapper Point. Port Phillip Bay. 



Chione subroborata, spec. nov. Plate xiv., fig. 17. 



Cordately-trigonal, solid, much broader in front than be- 

 hind, where it is subrostrate, thick, moderately convex ; flat- 

 tened in the umbonal region. Umbones small, recurved, and 

 situated considerably in front of the middle line. Surface 

 glossy, ornamented with concentric lamellae (about 15) and 

 striae ; the lamellae are rather thick, recurved, except on the 

 posterior slope, where they are erect. 



The ventral margin is broadly curved, slightly insinuate to- 

 wards the posterior end ; the post-dorsal line is oblique, arched 

 behind the umbones, then straighter, prolonged, and much de- 

 scending ; the front-dorsal line is excavated. 



The lunule is small, broadly cordate, and lamellate sculp- 

 tured. The margin of the valves is very finely crenulated. 

 Pallial line distant from the margin ; the inflection rather 

 shallow, broadly triangular, subacute at the apex. 



Dimensions. — Antero-posterior diameter, 25 ; umbo-ventral 

 diameter, 24 ; umbo to post-ventral angle, 25 ; sectional 

 diameter of both valves, 14 millimetres. 



Localities. — Common in the upper beds at Muddy Creek ; 

 oyster beds at Nor'-West Bend ; calciferous sandstone at Mor- 

 dialloc. 



This species comes very near to C. rohoraia, Hanley, but the 

 lamellae are fewer and thinner ; it is less produced anteriorly, 



