142 HELIX-HADRA. 



H. GILBERTI Pfeiffer. PI. 43, fig. 41. 



Shell umbilicated, depressed, distinctly striated, very minutely 

 granulated, thin, of a pale-horny tint, ornamented by a red line at 

 the suture ; whorls 4 2, somewhat convex, the last convex at the 

 base ; umbilicus moderate and pervious ; aperture rotundately-lunar ; 

 peristome simple and straight, with the columellar margin very 

 little dilated and reflected. (Pfr.) 



Alt. 9, greater diam. 16, lesser 14 mill. 



Darling Downs, Queensland; Brisbane Water; Hunter River, 

 Australia. 



H. gilberti PFR., P. Z. S. 1845, p. 127 ; MOD. Hel. Viv. i, p. 108. 

 Cox Mon. Austr. L. Sh., p. 30, t. 1, f. 8. 



The above description was drawn from immature examples. 

 Adults, it is stated, are extremely like Jervisensis, measuring, alt. 

 13*, greater diam. 22, lesser 18 mill. The right margin of the 

 peristome is somewhat expanded ; the columella of a violet tint, and 

 reflected over the umbilicus. It differs from Jervisensis in being 

 more solid, the whorls more gradually increasing, the last one less 

 inflated. 



H. MARCESCENS Cox. PL 58, figs. 17, 18, 19. 



Shell narrowly and deeply umbilicated, depressedly-orbicular, 

 thin, translucent, rather shining, very slightly rugosely striated and 

 under the lens, very finely granulated, horny-yellowish ; spire con- 

 vex, obtuse, suture moderate, margined with a narrow' reddish 

 streak ; whorls 5, slowly increasing, slightly convex, last roundly 

 convex ; aperture lunately-rounded ; peristome straight, thin, mar- 

 gins somewhat approaching, columellar margin above dilated and 

 reflected. (Cox.) Alt. 0'30, greater diam. 0*63, lesser 0'57 inch. 



Clarence River, about South Grafton, under bark and logs. 



H. marceseens Cox, Proc. Zool. Soc. Loud. 1867 ; Monogr. Austr. 

 L. Sh., p. 37, t. 4, f. 5, t. 18, f. 6, 6a. 



A thin, horny, semitransparent shell, like a starved miniature of 

 H. grayi and to be placed next to H. aridorum, a much .more 

 globose shell with a deeply impressed suture. The reddish streak 

 along the suture is not always present. (Cox.) 



H. EVANDALEANA PfeifFer. PL 40, figs. 8, 9. 



Shell umbilicated, depressed, rather thin, rugosely striated, and 

 under the lens granulated and furnished with short hairs, dirty- 

 yellowish or blackish-brown ; spire slightly elevated, obtuse, suture 



