147 



This species, wliicli is named after J. Dennant, Esq., Hamil- 

 ton, in recognition of palaeontological services rendered, has no 

 immediate ally in recent creation, but it has some general re- 

 semblance to C. Traillii, Hutton, of the Older Tertiary of Xew 

 Zealand, from which it differs by its truncated posterior 

 margin and its concentric folds. 



Grassatella aphrodina, Tenison-Woods. 



Beference. — Proc. Koy. Soc, Tasm., for 1875, t. iii., fig. 12, 

 p. 24. 



" Ovate-trigonal, oblique solid, faintly striate and sulcate ; 

 umbones sharp, with more distinct sulci; lunule impressed; 

 posterior side subangulate and produced. Long., 53 ; lat., 44 

 mills." 



Localities. — Table Cape ; Adelaide bore (fragments of 

 hinge) . 



This species is related to O. australis, Hutton, of the jN'ew 

 JZealand Tertiary. 



Grassatella astartiformis, spec. nov. PI. xi., figs. 12 and 15. 



Shell subquadrate, slightly convex ; umbones a little 

 anterior ; dorsal margin rather straight ; posterior side 

 roundly truncated, anterior side convex. Surface ornamented 

 with concentric folds and minute, radial striae ; the folds are 

 compressed, somewhat reflected, narrower than the furrows, 

 more regular and stouter in the umbonal region. 



Dimensions of a very large specimen : — Length, 20 ; width, 

 17 ; thickness through both valves, 8 millimetres. 



Localities. — A^ery abundant of small size, Aldinga and Ade- 

 laide bore ; rare, E. Murray Cliffs ; Muddy Creek and 

 Schnapper Point {E.T.). 



Grassatella corrugata, spec. nov. PI. ii., fig. 14. 



Shell subquadrate, similar to C. astartiformis, but propor- 

 tionately longer ; surface with a few high angular corrugations, 

 and striated between. 



Dimensions. — Length, 6 ; width, 4"5 millimetres. 



Locality. — Clays with Turritella AlcUngce at Blanche Point, 

 Aldinga Bay. 



Grassatella abbreviata, spec. nov. PI. xi., fig. 16. 



Shell subtriangular, elevated, compressed, inequilateral ; 

 umbones anterior, prominent ; dorsal margin much sloped ; 

 anterior side very short ; posterior margin roundly truncated. 

 Surface ornamented with numerous narrow concentric folds. 

 Inner margin of valves plain. 



