280 HADRA. 



simple, everted and slightly expanded ; aperture roundly lunate, 

 darker within than at the internal edge ; upper edge of the peris- 

 tome inserted into the carinal margin of the periphery of the last 

 whorl ; columella triangularly expanded, white and smooth, no 

 trace of a callous expansion between the ends of the peristome on 

 the body whorl. The suture of the whorls is well impressed, mar- 

 gined above with a faint opaque white line, a continuation of the 

 carinal margin of the periphery. The apex shows no signs of a 

 granular sculpture. 



Diam. maj. 20, min. 17, alt. 14 mill. (Cox.') 



The Oscar Ranges, 20 miles from the Barrier Ranges, West Aus- 

 tralia (Froggatt). Type in the Macleay Museum. 



Helix (Hadra) oscarensis Cox, Proc. Linn. Soc. N. S. Wales, (2) 

 vi. p. 565, t. 20, f. 6, 7. 



H. DERBYI Cox. PI. 58, figs. 20, 21. 



Shell depressedly globose; whorls 5* to 6, very gradually 

 increasing, with a moderately large open deep umbilicus, more so 

 than is represented in fig. 21 ; the periphery of the last whorl is 

 smoothly rounded to the aperture; color light brown, marbled with 

 lighter patches, but not regularly across the whorls ; surface 

 strongly but irregularly transversely striated with curved lines of 

 growth, the convexity of the curves being upward. Apex very 

 slightly raised ; last whorl deflected at its termination ; the peri- 

 phery is margined by a narrow pale band, but in no way carinated ; 

 aperture elongately lunate, the right margin inserted below the 

 center of the periphery of the preceding whorl, the columellar mar- 

 gin with a slight expansion at its insertion, the edge of the peris- 

 tome very slightly everted and thickened. Apical whorl quite 

 smooth. The base of the shell is convex, more faintly striated than 

 the upper surface, of a lighter color and not marbled. Whorls 

 rounded, suture deep and well defined, but not margined. 



Diam. maj. 11, min. 9, alt. 6 mill. (Cox.} 



The Derby District, Barrier Ranges, Western Australia (Frog- 

 gait}. Type in Macleay Museum. 



Helix (Hadra) derbyi Cox, 1. c., p. 566, t. 20, f. 4, 5. 



( Group of H. grayi Pfr.) 

 H. GULOSA Gould. (Vol. VI, p. 131.) 



Mr. John Brazienhas given the synonymy of this species in full, 



