AUSTRALIAN LAND SHELLS. 93 



thin, shining, amber-colour or pale yellow ; suture margined, fur- 

 nished with papillseformed folds ; whorls in the adult state 4 to 4^-, 

 rather convex, last with folds at the base, very shortly or obsoletely 

 crested ; aperture vertical, angulaidy oval, somewhat broad at the 

 base ; peristome continuous, thin, rather expanded. 



Obs. Young shell turreted, apex acute ; whorls 8, swollen, ribbed 

 above, last obtusely angled. 



Length 0*25 ; breadth 009 ; aperture about O07 long, of an inch. 



Habitat. Port Lincoln, S. Australia, very plentiful. Masters. 



225. Truncatella scalarina. Cox. Plate XV. Fig. 10 natural 

 size, 10 a., 10 b. much enlarged. M.C. 

 Cox, Pro. Zool. Soc, 1867^ p. 40. 



Shell imperforate, fusiformly turreted, smooth, shining, white ; spire 

 decollated, suture constricted ; whorls 4 at the least, convex, strongly 

 longitudinally and regularly ribbed, last ecpialling in length the 

 three preceding ones ; aperture oblique, oblongly-ovate ; peristome 

 continuous, free, callous, expanded, especially above, exhibiting 

 underneath a bilabiated form, right margin curved, rounded below, 

 superior margin nearly straight ; operculum ? 



Length 023 ; breadth O'll of an inch. 



Habitat. Port Lincoln, in great abundance. Masters. 



This remarkable shell, reminding one somewhat of a scalaria, occurs in 

 a semi-fossil state in the same district where the recent smaller and 

 smoother T. marginata, Kiister, appears to be plentiful. 



226. Truncatella Yorkensis. Cox. Plate XV. Fig. 11 natural 

 size, 11a., lib. much enlarged. M.C. 



Shell scarcely rimate, cylindrical, attenuated, rather thin, ribs dull- 

 pale-yellow, scarcely waving, very slightly elevated, smooth, with 

 the interstices diaphanous, chalky white and equi-distant, suture 

 indented; whorls in the adult state 4, slightly convex, last elongated; 

 aperture vertical, large and broadly oval, angled above ; peristome 

 white, continuous, slightly thickened, straight, columellar margin 

 expanded and moderately reflected ; operculum ? 



Length - 34 ; breadth 013 ; aperture - 08 long, of an inch. 



Habitat. Cape York, N. E. Australia. Darnel. 



This species may be distinguished by its fine straight shining ribs with 

 chalky interstices, acd its pure white mouth. 



227. Truncatella Brazieri. Cox. Plate XV. Fig. 12 natural 

 size, 12 a., 12 b. much enlarged. M.C 



Shell rimate, cylindrical, sub-attenuated, solid, ribs elevated, rather 

 straight, large, and widely separated, the interstices longitudinally 

 striated, reddish-yellow ; whorls in the adult state 4, rather convex, 

 gradually increasing in size, suture margined ; aperture oval ; peris- 

 tome continuous, thickened ; columellar margin straight, thickened, 

 and reflected ; operculum ? 



Length 0-27 ; breadth 0*10 ; aperture - 09 long, of an inch. 



