34 HELIX. 



Y. Australasian Species. 



H. MOBTI, Cox. PL 7, figs. 81, 88. 



Widely, profoundly umbilicated, brownish, rugosety coState, 

 the interstices very minutely, lightly, decussately striate-punc- 

 tulate, somewhat solid ; whorls 5, a little convex, the last rounded. 



Diam. 2 mill. 



Sydney, Australia. 



H. paradoxa, Cox, is a synonym. This and several following 

 species belong to Discus. 



H. HOBARTI, Cox. PL 7, figs. 89, 90. 



Openly, deeply umbilicated, dark brown, closely regularly 

 costate; whorls 4J, rounded, base convex; aperture almost 

 circular, the margins approximating, the columellar not everted. 



Diam. 12 mill. 



Hobart, Tasmania. 

 Allied to the preceding species. 



H. TASMANIA, Cox. PL 7, figs. 91, 92. 



Largely deeply umbilicated, thin, regularly, strongly costate, 

 alternately dark chestnut and pallid ; whorls 5, planulate towards 

 the suture, the last slightly descending in front, base convex ; 

 margins of aperture somewhat approaching, the columellar 

 margin not dilated. Diam. 3 mill. 



Mt. Wellington, Tasmania. 



H. STELLATA, Brazier. PL 7, figs, 93, 94. 



Deeply, perspectively umbilicated, chestnut-colored, not shin- 

 ing, everywhere regularly, lightly costate, suture narrow and 

 deep ; whorls 4^, rounded, the last slightly descending in front. 



Diam. 2 mill. 



Mt. Wellington, Tasmania. 



H. similis, Cox (not Adams), is a synonym. 



H. RETIPORA, Cox. PL 7, figs. 95, 96. 



Perforate, closely costulately striate, decussated by very minute 

 concentric lines, rather solid, somewhat shining, reddish corne- 

 ous, lighter colored below, suture moderately impressed ; whorls 

 4, plano-convex, the last not descending, convex below ; aperture 

 oblique, almost rounded-lunate. Diam. 5 mill. 



Flinders Range , Australia. 



