332 



Dimensions. — Basal diameters, 15 and 16 : height, 4-2.5. 

 Localities. — Eocene : Aldinga Clitts and Adelaide-boi-e. 



3. Calyptraea subtabulata, -^ec. nor. pi. vii., %. i. 



Syn. — Trochita cnlyptraeformis, R. M. Johnston, Proc. Roy. Soc. 

 Tasmania for 1876, p. 86 (1877) ; id., " (^eol. Tasm.," t. 29^ f. u! 



Shell moderately stout, orbicular in basal outline, spire elevated, 

 subcentral ; apex minute, slightly exsert ; body-whorl conspicu- 

 ously flattened in front of suture, surface with subimbricating 

 growth-folds and spiral coarse stria? : septum with a nearly 

 straight edge. 



The shell varies much in height, and the higher the spire the 

 more tabulated are the whorls, the figured specimen represents 

 the most commonly-occurring form. 



Dimensions. — Basal diameters, 29*5 and 26*5 ; height, 12. 



Locality. — Eocene: Table Cape, Tasmania, R. M. Johnston, kc. ! 



This aljundant fossil at Table Cape was referred by Johnston 

 to the living Australian shell, Troclius calypfmeformis, Lamarck 

 { = Calyptraea tomentosa^ Q^ioy and G.), to which, however, it has- 

 only a distant resemblance. 



Pileopsis nai-icelloides, R. M. Johnston, Poc. Roy. 8oc., 

 Tasmania, for 1879, p. 39 (1880), is probably a Calyptraea, and 

 possibly a very young state of C. subtabulata. The original 

 diagnosis reads as follows : — Shell minute, depressed, subrotund ; 

 nucleus scarcely lax, exserted, of about one and a half smooth 

 turns, submarginal ; disk with rough uneven surface, concentric- 

 ally irregularly striate : aperture ovate, closed at posterior 

 margin by a spiral concave shelf, terminating on either side by a 

 downward reflexed curve in the muscular impressions, which are 

 well-defined. Dia. mag., 3-5 : min., 3 : alt., 1. Table Cape 

 (one specimen). 



4. Calyptraea undulata, spec ,toc. PL vii., tig. 3. 



Shell thin, orbicular in basal outline ; spire elevated, subcen- 

 tral, of rather rapidly increasing, steep-sloping whorls ; apex 

 minute, oblique, circinately-coiled ; body-whorl regularly convex ; 

 surface concentrically ridged and coincidently striated, faintly 

 spirally-lined ; septum with a nearly straight edge. 



Dimensions. — Major and minor diameters, 16*5 and 15-5 ; 

 height, 8. 



Localities. — Eocene : Muddy Creek ; River Murray Cliffs. 



Differs from C. snhtabnlata by regular convex whorls and more 

 excentric spire. 



5. Calyptraea crassa, n^ec. nor. Pi. vii., figs. 2, 7. 



Shell rather stout, orbicular in basal outline ; spire elevated, 

 subcentral of rapidly increasing, moderately convex whorls ; 



