32 ATJSTEALIAH LAND SHELLS. 



largo, perspective; aperture very oblique, lunately-elliptieal; peris- 

 tome somewhat simple, margins converging, right slightly curved, 



then a strong- sinuation in front, columellar margin slightly curved, 



moderately thickened, and slightly reflected. 

 Diameter, greatest 1 ;)(); hast T20; height 0-65 of an inch. 

 Habitat. Tasmania. Gfunn. 



82. Helix bisulcata. Pfr. Plate IX. Fig. 19, copied from Reeve. 

 Pfr., Pro. Zool. Soc, 1852, p. 135. 



Peeve, Cone. Icon. sp. 969. 



Shell widely umbilicated, convexly-depressed, spirally and very 

 minutely obliquely wrinkle-striated, shining, tawny-chestnut ; spire 

 shortly conoidly-convex, slightly obtuse at -the apex ; suture im- 

 pressed ; whorls 6^, slightly convex, last much wider, periphery ob- 

 soletely angular, not descending in front, base flat, sub-compressed 

 about the umbilicus, on both sides impressly furrowed in the 

 middle ; aperture small, slightly oblique, sub-triangularly-lunate ; 

 peristome rather simple, margins scarcely converging, right straight, 

 sloping, basal slightly arched, somewhat thickened. 



Diameter, greatest 1-14; least 098; height 0'50 of an inch. 



Habitat. Tasmania. Gunn. 



Reeve remarks of this, that it is Solariiform, that the lip is simple, 

 peculiarly wart-toothed within, along the line formed by the im- 

 pressed groove. 



83. Helix Sinclairi. Pfr. Plate VII. Fig. 3 a., natural size, 

 3, slighthj enlarged, 3 b., a portion magnified. M.C. 

 Pfr., Zeit-schrift fur Malac, 1845, p. 154. 



Peeve, Cone. Icon. sp. 1444. 



Shell umbilicated, depressed, thin, translucent, not shining, very 

 regularly and very closely, rather prominently, ribbed, horny- 

 yellowish, with many interrupted spiral reddish bands ; spire 

 flattened; whorls 4, flatly-convex, quickly increasing, last large, 

 depressed, convex externally, much deflected in front ; base smoother 

 and more glossy, umbilicus widely funnel-shaped, nearly equalling 

 J of the diameter ; aperture diagonal, ovately-lunar ; peristome 

 simple, thin, regular, margins approximating, columellar margin 

 scarcely dilated or reflected. 



Diameter, greatest 0'70 ; least - 60 ; height 0'25 of an inch. 



Habitat. Mount Wellington and elsewhere, in Tasmania. Cox. 



As Peeve remarks, this species is chiefly remarkable for its beautiful 

 close-set ribbed sculpture. 



83. Helix Hamilton!. Cox. Plate VII. Fig. 2, natural size, 

 2 a. enlarged. M.C. 



Cox, Pro. Zool. Soc., 1867. 



Shell umbilicated, sub-discoid, eonvexly depressed, thin, very closely 

 and sub-arcuately ribbed, interstices with extremely fine thread-like 

 lines, crossed by extremely minute spiral ones, giving the shell, 

 under the lens, a linearly granular appearance, not shining, pale 



