151 



Radial ridges on the posterior slope only, rest of surface 

 radially and concentrically striated. C. antisemigranuJatum. 



Anterior half of valve cancellated, the posterior half with 

 spinulose ribs. C.hemimeris. 



Cardium pseudomagnum, McCoy. 



Reference. — Pal. Victoria, Decade v., t. 41, f. 1, 1877. 



" Eotundly quadrate ; ribs 50, sub-equal, flat, smooth, without 

 spines or marked striae, and separated by very narrow sulci, 

 their ends strongly toothing the internal margin. Length of 

 the antero-posterior diameter, 90 millimetres. Locality. — Very 

 abundant in the sandy beds, Bird Eock Bluff, near Geelong." — 

 McCoy. 



Cardium moniletectum, spec. nov. Plate xiv., figs. 3a. — 3b. 



Eotundly quadrate, slightly oblique, subequilateral, ventri- 

 cose ; ventral margin moderately convex ; posterior slope 

 flattened, becoming a little convex dorsally, its margin straight, 

 nearly perpendicular ; post-dorsal margin nearly straight, 

 slightly ascending ; front dorsal margin straight, a little 

 sloping, joining somewhat abruptly the flatly rounded anterior 

 margin. Umbo inflated, moderately oblique, and a little in 

 front of the centre. 



Eibs, about 60, equal, flat, smooth, shining, minutely, closely 

 and regularly granulated on the margins ; intervening sulci 

 very narrow and deep. Margin of valves strongly toothed. 



Dimensions. — Antero-posterior diameter, 38 ; umbo-ventral 

 diameter, 10 ; sectional diameter through closed valves at 

 about half the length from the umbo, 31 millimetres. 



Locality. — Abundant in the clayey green sands, Adelaide 

 bore. 



Cardium septuagenarium, spec. nov. 



Shell of about the same size and shape of C. moniletectum, 

 but with about 70 flat, smooth, slender ribs, those of the pos- 

 terior slope crowned with small tubercles ; the intervening 

 sulci nearly as broad as the ribs, shallow, and transversely finely 

 striated. 



Localities. — Table Cape (JR. M. Johnston!), and in a well- 

 sinking at Xine-Mile Camp, near Nor'-west Bend, Eiver 

 Murray Plain. 



Cardium Victoriae, spec. nov. Plate xiv., figs, la— lb. 

 Shell longitudinally ovate, somewhat heart-shaped, rather 

 depressed, slightly oblique, subequilateral. Ornamented with 

 about G5 delicate, flattish, radial costaa ; costae with distant 

 decurrent serratures on their sides, those on the anterior side 

 with elevated, thick, distant, annular scales or tubercles : six 



