566 DESCRIPTIONS OF SOME NEW SPECIES OF PULMONATE MOLLUSCA, 



upper margin of the peristome 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, margined 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 mm. 



Hah. — The Oscar Ranges, 20 miles from the Barrier Ranges, 

 West Australia (Froggatt). 



Type in the Macleay Museum. 



Helix (Hadra) derbyi, n.sp. 



(PI. xx., figs. 4 and 5.) 



Shell depressedly globose ; whorls 5^- to 6, very gradually 

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

 than is represented in fig. 5 ; the periphery of the last whorl is 

 smoothly rounded to the aperture ; colour 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 upwards. Apex 

 very slightly raised ; last whorl deflected at its termination ; the 

 periphery is margined by a narrow pale band, but in no way 

 carinated ; aperture elongately lunate, the right margin inserted 

 below the centre of the periphery of the preceding whorl, the 

 columellar margin with a slight expansion at its insertion, the 

 edge of the peristome 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 colour and not marbled. 

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

 Diam. maj. 11, min. 9, alt. 6 mm. 



Hob. — The Derby District, Barrier Ranges, Western Australia 

 (Froggatt). 



Type in the Macleay Museum. 



