TASMANIAN LAND SHELLS. 53 



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

 free, callus, expanded, especially above, exhibiting underneath a bi- 

 labiated form ; right margin curved, rounded below ; superior margin 

 nearly straight ; operculum (?). 



Length, 0*23 ; breadth, O'll of an inch. 



HoMtat. — Port Lincoln, South Australia ; islands in Bass Straits. 



Said to occur in a semi-fossil state only in South Australia. On the 

 islands in Bass Straits it is very abundant, in company with our other 

 two (?) species. Neither this, nor either of the other species, has been 

 observed on the mainland, and all appear to be confined to the Straits. 



2. — Truncatella Tasmanica — Tenison- Woods. 



Pro. Koyal Soc. Tas., 1875. 

 Census Tas. Marine Shells, 1877. 



Shell decollate, cylindrically turreted, small, thin, shining, pale 

 fulvous ; whorls 5 (if not decollate), somewhat convex, furnished very 

 thickly with small subacute plaits (in last whorl 30-35) ; aperture pyri- 

 form, angulate and sulcate above ; outer lip bi-marginate, sub-expanded ; 

 lip reflected ; peristome continuous. 



Long. 7, lat. 3 mil. 



Habitat. — Islands in Bass Straits. 



This shell has been obtained in great profusion, particularly in the 

 Furneaux Group. Mr. Woods remarks of it " The plaits or ribs on the 

 shell are very like those on most Scalaria. For my own part I think it 

 very difficult to distinguish the species from T. teres (Pfr.), T. scalarina, 

 T. Torkensis, and T. Brazier, the last three of Dr. James Cox." 



Possibly but a variety of the last species. 



3. — Truncatella marginata — Kilster. 



Mon., p. 12, sp. 8, pi. ii., fig. 24-26. 



Cox, Mon., p. 92, pi. xv., fig. 8, 8a 8&. 



Tenison- Woods, Census Tas. Marine Shells, 1877. 



Shell sub-rimate, cylindrical, gradually attenuating upwards, rather 

 thin, shining, amber colour or pale yellow ; suture margined, furnished 

 with papillse-formed folds ; whorls in the adult state 4 to 4J, rather 

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

 aperture vertical, angularly-oval, somewhat broad at the base ; peristome 

 continuous, thin, rather expanded. 



