131 



Dimensions of Type. — Length, 85 mm. (apex wanting) ; 

 breadth, 33 mm. 



Locality. — Subcrystalline miocene limestone near Edith- 

 bnrg ; also miocene limestone at Hallett's Cove. 



Itemar'ks. — In general shape of whorls and .outline this fossil 

 ■species comes near to large examples of C . laeve, Q. and G., 

 now living in Western Australian waters, although the two 

 very distinctive ornamentations are hardly comparable. 



In the Catalogue of Tertiary Mollusca of the British Museum, 

 part I, p. 228, Mr. G. F. Harris, F.G.S., writes: ''Cast of a 

 large species of Cerithium, probably referable to the 

 -subgenus Campanile from Kadina, South Australia." This 

 species mentioned by Mr. Harris will no doubt be referable ^o 

 C. triseriale. 



Meretrix sphericula, spec. nov. PI. ii., fig. 2. 



Shell solid, triangularly orbicular, slightly inequilateral, a 

 little wider than high. Surface ornamerted with rather 

 coarse, irregular lines of growth and fine concentric threads, and 

 also (more distinctly visible on the partially denuded portions) 

 by faint radial str'?e. Umbones small, depressed, curved over 

 towards the front, apparently somewhat oblique. Lunule pro- 

 minent, lanceolate. Ventral margin smooth and regularly 

 cm-ved. Both valves much inflated and regularly convex, thus 

 effecting, with united valves, a globose, more or less spherical 

 appearance. Interior unknown. 



Dimensions of Type. — Antero-posterior diameter 74, umbo- 

 ventral diameter 67, sectional diameter of united valves 50 mil- 

 limeters. 



Locality. — Subcrystalline miocene limestone about Edith- 

 burg. 



Large, imperfect casts, referable to this species, as large as 

 95 millimeters antero-posterior, and 91 umbo-ventral diameter, 

 have also been found in the miocene cliffs at Aldinga Bay and 

 Hallett's Cove. 



Cardium mediosulcatum (Tate and Basedow), spec. nov. 

 PI. ii., fig. 3. 

 Cardium rotundly oval, a little higher than wide, moderately 

 convex, equilateral and equivalve. Umbos central, approxi- 

 mate, depressed. Surface ornamented with from 33 to 37 

 elevated, truncated ribs, narrower than the interspaces (3 in a 

 width of 5 mm. in medio-ventral area). Ribs with a medio 

 sulcus, here and there interrupted by obsolete, depressed, 



