190 
ON A NEw LAND SHELL FROM CENTRAL 
AUSTRALIA. 
By W. T. BEpNaLtL. 
[Read September 4, 1894.] 
HaApDRA ADCOCKIANA, sp. nov. 
Shell deeply umbilicated, depressedly globose, thin, shining, 
surface finely and evenly striated. Whorls four and a-half, flatly 
but regularly convex ; first and second very finely striated under 
the lens, striations becoming more pronounced with the revolution 
of the shell; last whorl three-fourths the size of the whole shell, 
descending slightly in front, constricted at the outer lip; base 
somewhat flattened ; striations extending from the suture to the 
umbilical region, but becoming much less distinct after crossing 
the periphery. Suture impressed. Aperture oblique, sub-circular, 
peristome thickened ; outer lip slightly expanded and reflected ; 
columellar margin narrowly expanded, and but partially covering 
the umbilicus; margins approximating, and connected by a 
diffused gamboge-colored callus. Color, opaque-white, encircled 
by two well-defined narrow fuscous bands, one at the upper part 
of the whorl adjoining the suture, the other just above the 
periphery ; both bands are clearly seen in the interior of the 
aperture. 
Dimensions.—Major diameter, 14 mm.; minor, 12 mm. ; alti- 
tude, 8 mm.; height of aperture, 7 mm.; length, 7-5 mm.; 
diameter of umbilicus, 2 mm. | 
This species appears to occupy an intermediate position be- 
tween Hadra Everardensis, Bednall, of the Everard Range, and 
the more Southern representative of the genus, Hadra Lorioliana, 
Crosse, of the Flinders Range. It is less conical than the 
former, and not so depressed as the latter species. 
All the specimens—three in number—are perfect, and evi- 
dently full-grown. They are in the collection of Mr. D. J. Ad- 
cock, and were obtained by Mr. Robert Thornton, of the Tempe 
Downs Station, early in 1893. 
Relative dimensions of the species referred to :— 
Major Minor Height of Length of Diam. of 
diam. diam. Altitude. Aperture. Aperture. Umbilicus. 
Lorioliana ... 26 22 14 14 15 — 
Adcockiana ... 14 12 are ff (ei: 2 
Everardensis... 13 11°5 9°75 C19 B75 2:5 
