120 



DESCRIPTION OF A NEW SPECIES OF It HAG ABA FROM 

 WESTERN AUSTRALIA. 



By H. B. Preston, F.Z.S. 



Head 10th April, 1908. 



Rhagada Radleyi, n.sp. 



Shell discoidal, depressed, white, painted above the periphery with 

 two greyish-brown bands, and below with five bands of the same 

 colour ; whorls 4 1 , transversely marked with lines of growth, the last 

 whorl descending ; sutures well impressed ; aperture rather oblique, 

 roundly lunate ; peristome expanded, scarcely reflexed ; columella 

 descending obliquely, expanded over and almost sealing the umbilicus 

 and diffused above into a light parietal callus. Alt. 8'5, diam. maj. 

 15 mm.; aperture, alt. 6, diam. 4 mm. 



Sab. — Western Australia. 



Allied to a. Reinga, Gray, but smaller, and much more depressed ; 

 the umbilicus also is not quite closed, as is invariably the case in that 

 species. 



