PETTERD : NEW TASMANIAN SHELLS. 1 39 



16. Schismope Beddomei n. sp. Shell small, turbinately 

 depressed; sordidly white, dull, thin ; whorls 3^, 

 apical flat, sinus conspicuous with raised margins ; 

 longitudinally plicate, plicae more prominent at the 

 base; aperture ovate, of moderate size. Long, i mill., 

 lat. ^ mill. 



Habitat, North-west coast. Rarely met with in 

 good condition. 



17. Schismope pulchra n. sp. Shell thin, white; whorls 

 4, last with two prominent keels at the periphery and 

 several smaller at the base, longitudinally striate, strise 

 passing over the keels, giving them a nodose appear- 

 ance. Long. 2 mill., lat. i mill. 



Habitat, North-west coast (Miss Lodder). 



In form not unlike S. A fh'nsom't TenisonWoods, 

 but very different in ornamentation. It was found 

 in shell sand, and from its light texture is generally 

 more or less broken. This is the fourth species of 

 the genus described from our coasts. 



18. Crossea minuta n. sp. Shell minute, turbinate, smooth, 



white, shining; whorls 4^, rounded; umbilicus minute, 

 aperture ovate, labrum somewhat thickened. Long. 

 I mill., lat. ^ mill. 



Habitat, Long Bay, ten fathoms. 



The smallest known form of the genus. 



19. Cyclostrema micra n. sp. Shell discoidal, shining, 



sordid white, marked with lines of growth ; whorls 

 4^, rounded, suture impressed; base convex; umbilicus 

 open ; aperture circular, simple. Long, i mill., lat. 

 I mill. 



Habitat, North Coast and Isles in Bass's Straits. 



A very minute species of no decided character, 

 but quite distinct from our other forms of the genus. 



