152 



valves, 26 ; length o£ anterior side, 8 ; from umbo to post- 

 ventral angle, 35 millimetres. 



Locality. — Calciferous sandstone, Glenforslan, near Blanche- 

 town, on the Eiver Murray. 



This species has some affinity to C. spinulosa, but is more 

 produced and less inflated, and has a different ornament ; 

 among recent species it has the shape and number of ribs of 

 (7. angisulcata, Eeeve, but in that shell the ribs are flat, broad, 

 and close together. 



Cardita scabrosa, s-pec. nov. PI. ii., fig. 4. 



Shell oval-subquadrate, anterior side very short, moderately 

 convex ; umbones anterior, incurved ; posterior margin 

 abruptly truncated; posterior side slightly dilated and flat- 

 tened ; inner margin of valves coarsely crenulated. Surface 

 ornamented with 30 narrow compressed radial ribs, about as 

 wide, or not quite so wide, as the interspaces ; ribs densely 

 covered with erect scales, which are somewhat spathulate, ex- 

 cept on the posterior slope where they are somewhat oblong. 



Dimensions. — Length, 21 ; width, 16 ; thickness through 

 both valves, 12 millimetres. 



Localities. — Calciferous sandrockof the Eiver Murray Cliffs, 

 near Morgan ; Muddy Creek ; Corio Bay. 



Cardita gracilicostata, Tenison- Woods. PI. ii., figs. 6 and 8. 



Reference.— Vroc. Eoy. Soc, Tasm., for 1876, p. 112 (1877). 



Shell roundly-oblong, transverse, inequilateral, moderately 

 inflated ; umbones anterior, oblique, much incurved. Surface 

 ornamented with transverse raised lirse, and about 30 curved, 

 radiating ribs, narrower than the concave interspaces; the 

 ribs are laterally compressed, obsoletely nodular in the adult, 

 except the anterior and posterior slopes, where the nodula- 

 tions become less rounded and more lamellose. In young 

 shells the ribs are densely beset with thick imbricating scales, 

 somewhat spinous on the posterior slope, and granule se on the 

 anterior side; minutely granular in the interspaces. Inner 

 margin of valves coarsely crenulated ; lunule short cordate, 

 well defined and deep. 



Dimensions of a large specimen : — Length, 35 ; of posterior 

 side, 25 ; width, 31 ; thickness through both valves, 20 milli- 

 metres. 



LocaUti/.—Tsible Cape, Tasmania! (B. M. Johnston). 



Of the many recent and fossil species with which I have com- 

 pared C. gracilicostata, C. acuticostata, Lamarck, of the Anglo- 

 Parisian Eocene basin, is the only one to which it bears any 

 resemblance ; from that species it differs in being less orbicular 

 and in its simple ribs. 



