62 



spaces ; tlie interstitial lirtie and tlie innbonal aspect of the 

 lamini^i are crossed by fine, close striie. Tlie lamina? are erect, 

 sliort, with an acute, sliglitly and irregularly broken edge. 



Dimensions. — Antero-posterior diameter, 14-5 ; umbo-ventral 

 •diameter, 9*5 ; sectional diameter of united valves, 6 millimetres. 



Locality. — One fresh specimen dredged in deep water off 

 Kangaroo Island, Spencer Gulf (S. Aust. Mus.). 



The only species having concentric striate ornament between 

 the lamelhe, and without radial riblets are V. tumida, Sow., and 

 V. interstriata, Sow.; the former shell is ventricose, and both are 

 very finely striated betw^een the lamellse, whilst the present 

 species is depressed, and the interstitial ornament consists of 

 round threads, other less striking differences can be pointed ont. 



Cardium erugatum, sjiec. nov. Plate xi., fig. 6. 



Shell obliquely subquadrate, about as long as high ; narrowed 

 and rounded in front, broadish and curvedly truncate behind ; 

 inequilateral, moderately convex, pure white, and ornamented 

 with about 25 flat ribs, much broader than the furrows. The 

 medial ribs are wider than the anterior or posterior ones ; the 

 anterior ribs bear close, transverse, compressed scales. 



Dimensions. — Antero-posterior diameter, 13 ; umbo-ventral 

 <liameter, 12*5 ; sectional diameter, 7 millimetres. 



Locality. — A few single valves cast up at Royston Head, 

 Southern Yorke Peninsula (G. F. Matthews). 



This species seems to resemble C. Dionrmm, Sowerby, but it 

 has not the spinosely dentated ribs of that shell. 



Carditella subradiata, spec. nov. Plate xi., fig. 7. 



Shell minute, ovately trigonal, inequilateral, moderately 

 •convex ; umbo large, antemedian ; anterior side rounded, a little 

 incurved in front of the umbo ; ventrally rounded ; posterior side 

 a little produced, the post-dorsal slope nearly straight, inclined at 

 an acute angle. Inner margin of valves distantly and deeply 

 •crenulated. 



Surface smooth, shining, radially faintly ribbed, and concentri- 

 ■cally coarsely striated. The ribs are about 15 in number, de- 

 pressed, wider than the interspaces. 



i)^/>iens^o?^^^— Antero-posterior diameter, 3-5 ; umbo-ventral 

 diameter, 3*5 millimetres. 



Locafity. — Shell sand, Royston Head. 



This new species most resembles C. r ad lata, from the Eocene 

 beds of the Adelaide district, but is inequilateral, and has an in- 

 flated umbo. It is more triangular tlian C. infans with fewer 

 inornate ribs. 



