HELIX. 261 



CHAKOPA (Vol. II, p. 208). 



H. CCESUS, Cox, PL 37, figs. 42, 43. 



Deeply, narrowly umbilicated, thin, light reddish brown; whorls 

 5, convex, the last slightly depressed in front, base convex, umbili- 

 cal region excavated, surface with slightly irregular growth-lines; 

 peristome simple, margins approximating. Diam. 4 mill. 



Tasmania. 



H. HELICE, Cox. (Unfigured). Tasmania. 



MICROCYSTIS, (Vol. II, p. 112). 



H. TRANQUILA, Cox. PL 37, figs. 44, 45. 



Deeply, narrowly umbilicated, thin, transparent, pale olivaceous 

 brown, coarsely striated; whorls 5 ?, gradually increasing, the last 

 slightly descending anteriorly; aperture diagonal, peristome simple, 

 margins approximating. Diam. 9 mill. 



Tasmania. 

 H. (RHYSSOTA), MIXTA, Cox. PL 37, figs. 58, 59. 



Deeply, narrowly umbilicated, thin, transparent, shining, coarsely 

 striated, yellowish brown, or light olivaceous brown; whorls 5, 

 gradually increasing, flatly slanting towards the suture; peristome 

 simple, thin, margins very slightly approaching. 

 Diam. 6 mill. 



Tasmania. 

 Unfigured Species. 



H. (VIDENA) DuCANi, H. (PARYPHANTA?) VITRIN^FORMIS, 

 H. (VIDENA) QU^ESTIOSA, of Cox. Tasmania. 



CONULUS (Vol. II, p. 172). 



H. PARVISSIMA, Cox. PL 37, figs. 48, 49. 



Narrowly umbilicated, transparent, thin, pale yellowish brown, 

 smooth, shining, whorls 5J, convex, gradually enlarging, the last 

 not descending in front; peristome simple, thin. Diam. T25 mill. 



Tasmania. 



LEUCOCHROA (p. 10). 

 H. B^ETICA, Rossm. p. 11. 



Var. TUNETANA, Letourn. et Bourg. 



Shell finely striate above, not shagreened, peristome not thickened, 

 carinal thread not well defined. 



Tunit. 



