Palceo)itology of the Older Tertiary of Victoria. 229 



Cardita maudensis, sp. nov. 

 (Plate XII., figs. G, 7). 



Shell thick, rotundate oblong, somewhat depressed ; umbo 

 prominent incurved anteriorly ; anterior region small, anterit^ir 

 margin gently convexly rounded to join the slightly convex 

 ventral margin ; dorsal margin straight, obtusely truncate 

 posteriorly, some examples, particularly young shells, are not su 

 noticeably truncate posteriorly, but appear slightly shorter and 

 have their margins more regularly convexly rounded. Lunule 

 small, depressed, narrow, elongate, cordate. Surface ornamented 

 with nineteen or twenty comparatively broad closely nodulose 

 radiating ribs, separated by narrower shallow concave inter- 

 spaces, in which the concentric lines of growth are visible. The 

 nodulose ornamentation of the ribs may be truncated spines, as 

 some examples are inclined to be rather spinose anteriorly and 

 posteriorly. Inner margin of the valves coarsely denticulate. 



Dimensions. — Antero-posterior diameter, 10 mm.; umbo- ventral 

 diameter, 9 mm.; thickness through both valves, 7 mm. 



Locality. — Lower Eocene calcareous sands, Moorabool Valley 

 near Maude. Fifteen examples. 



Observations. — This species appears to be somewhat related to 

 C. delicatitla, Tate, and C. tasinanica, Tate, but from the former 

 it differs by not being so abruptly truncate posteriorly, by the 

 umbones not being so anterior, and by the fewer, broader, and 

 much more coarsely ornamented ribs, and from the latter, apart 

 from shape and dimensions, the present species has fewer and 

 broader ribs and much narrower interspaces between the ribs. 



CmONE IIALLI, sp. nov. 



(Plate XII., figs. 10, 11, 12.) 



Shell thin, tranversely oval, moderately convex as a rule, 

 though occasional examples are somewhat depressed ; umbo 

 prominent, incurved anteriorly, situate about one-third the 

 length of the shell from the anterior margin ; lunule well defined 

 cordate, much i-aised along the junction of the valves; shell 

 anterior to the beak concave ; anterior margin regularly con- 

 vexedly rounded ; post-dorsal margin at first gently sloping from 



