

HADRA. 279 



and the other at the suture, the suture being wound around the 

 center of the lower band of the preceding whorl, and the right mar- 

 gin of the peristome inserted at the lower edge of this band ; spire 

 elevated, obtuse at the apex. Whorls five, convex, regularly 

 increasing, the last rounded and inflated at the base in the region 

 of the lip, descending slightly in front ; aperture oblique, roundly 

 lunate, margins approximating, peristome thin, broadly reflected, 

 and very effusely dilated ; columellar margin narrowly expanded 

 above, and reflected over and partially concealing the umbilicus. 

 (Bednall.) 



Measurements. Major diam. 17, minor 14, alt. 12 mill. ; height 

 and length of aperture 10 mill.; diameter of umbilicus 2 mill. 



Birksgate Range. 



Helix (Hadra) elderi BEDNALL, Trans. Roy. Soc. S. Austr. xvi, 

 p. 66, t. 1, f. 2a-e (shell) ; 4, 5 (jaw and teeth.) 



This species is allied in its general characters to many South 

 Australian congeners, and is also ornamented with the rufous bands 

 so peculiar to the most of them, but is specially remarkable for the 

 very effuse dilatation of the outer lip, more particularly so where it 

 reaches the base of the shell. (Bednall.) 



H. OSCARENSIS Cox. PL 58, figs. 25., 26, (x 2). 



Shell lenticular; of a dull lustrous opaque cretaceous pale cream 

 color, except the three apical whorls, which are of a dark yellowish- 

 brown hue, and this deepening of color in a less degree is manifested 

 in a few irregular-sized spaces across the whorls (not sufficiently 

 shown in fig. 25). Whorls six, very gradually increasing in size ; 

 irregularly, but closely, rather coarsely, transversely arcuately 

 striate, with lines of growth becoming less distinct on the three api- 

 cal whorls as they approach the apex ; the whorls are flatly slant- 

 ing, not so rounded as fig. 25 would lead to suppose, smoother below 

 the periphery of the last whorl than above ; last whorl sub-acutely 

 keeled at the periphery, the keel is white and opaque, margining 

 the periphery of the last whorl before reaching the peristome, caus- 

 ing it to be rather acutely angled ; immediately below the periphe- 

 ral carinal edge of the last whorl, the color of the shell is darker 

 than the rest of the lower half of the whorl. With the mouth away 

 from one, as shown in fig. 26, the shell is seen to have a deep open 

 umbilicus, more so than is represented in fig. 26, about one-third of 

 it being overlapped by an expanded columella ; the peristome is 



