324 



D line iisio lis. — Length, 23 ; breadth, 21 ; diameter of aperture, 

 19 ; radius of aperture, 12. 



Localities. — Eocene : A common shell at Muddy Creek and 

 River Murray Cliffs I ; Cheltenham ! ; Camperdown! . Miocene : 

 Kalima, Gippsland Lakes ! (rare and small). 



Remarks. — This species is closely allied to X. repanda, Desh., 

 but is distinguished by more convex body-whorl, more oblique 

 aperture, and more obtuse and smaller spire. X. suhstolida con- 

 nects the section Xaticina, through X. siihinfiLndihulum, with 

 Sigaretopsis. 



The specimens from the Murray-river Cliffs are smaller and 

 have the umbilicus more concealed by the columella-callosity 

 than those from Muddy Creek. 



11. Natiea arata, n^ec. nor. pi. x., fig. 8. 



Shell solid, globulose, subsphserical ; spire excessively short, 

 apex obtuse ; whorls four and a-half, separated by a linear im- 

 pressed suture ; apical whorls two and a-half, smooth, flatly con- 

 vex ; the succeeding half turn with about twelve equi-distant 

 transverse sulcations producing a crenulate margin at the 

 posterior suture ; the surface of the remainder of the whorls 

 linear-sulcate spirally ; at first the interspaces are slightly ele- 

 vated, about equal in width to the sulci and slightly granulated 

 bv radial threads ; finally, on the body-whorl the interspaces are 

 flat and broad, about 1 mm. wide on the medial part, and "5 or 

 less at the base and near the suture ; obscurely lined transversely 

 and inconspicuously wrinkled at the suture. Aperture regularly 

 semilunate ; outer lip bevelled to a thin edge ; columella straight, 

 nearly vertical, rather thick, callously thinly expanding beyond 

 the umbilicus to join with the outer lip ; umbilicus wide, deep, 

 and simple. 



Dimensions. — Length and width, 18 ; diameter and radius of 

 aperture, 15 and 9*5; width of umbilicus, 3. 



Locality. — Eocene calciferous sandstone, River Murray Cliffs 

 (rare) ! ; Muddy Creek (one ex. I); 



12. Natiea limata, spec. nov. PI. x., fig. 4. 



Shell thin, fragile, globose ; spire short, broadly conic, obtuse ; 

 apical whorls two and a-half, shining, smooth, depressedly convex ; 

 the other whorls (two and a-half) regularly and moderately con- 

 vex, of moderate increase, separated by a narrow, deeply-im- 

 pressed suture. 



Ornament of crowded, raised, wavy threads, sometimes linear 

 at other times several times broader and flat, interrupted by 

 transverse incised lines and stri?e ; wrinkled at the suture, but 

 only prominently so on the early spire-whorls. 



