11G RECORDS OF THE AUSTRALIAN MUSEUM. 



Basilissa niceterium, sp.nov. 

 (Plate xxii., figs. 4, 5). 



Shell imperforate, conical-turbinate, thin, of silken lustre. 

 Colour uniform pale cream. Whorls five and a half, including a 

 small pointed obliquely set protoconch of a whorl and a half. 

 Sculpture : prominent spiral keels, three to the penultimate, ten 

 to the body whorl, successively diminishing from the suture to 

 the base, undercut below the narrow summit, parted by much 

 broader flat interstices. These keels, apparently folds in the 

 shell substance, are microscopically beaded by fine radial striae, 

 represented in the interstices as hair lines. The protoconch does 

 not share the adult sculpture, but is minutely inalleated. Aper- 

 ture oblique, subcircular, columella glazed, arched, running out 

 to a spur. Outer lip unfinished, the ends of the ribs projecting 

 beyond the interstices like claws. In the throat a furrow corres- 

 ponds to each external keel. Height, 7 ; maj. diam, 7 ; nrin. 

 diam., 6 mm. 



One whole and some fragmentary specimens were taken. 



The novelty is by no means a characteristic Basilissa, for it is 

 imperforate, its lustre is rather silken than nacreous, if the 

 sutural sinuation exists, it is masked by the sculpture. Yet the 

 aggregate of its characters agree better with Basilissa than with 

 another genus. From Segiienzia, for instance, which the sculp- 

 ture immediately suggests, the entire columella excludes it. 



Liotia petalifera, sp.nov. 



(Plate xxii., figs. 6, 7, 8.) 



Shell minute subdiscoidal, spire very little elevated, base 

 broadly and deeply umbilicate. Colour white. Whorls four, of 

 which two constitute the protoconch, the last descending, and in 

 slight contact with its predecessor. The protoconch is smooth, 

 helicoid, and sharply defined. Sculpture : last whorl with 

 twenty-four, penultimate with nineteen, elevated curled and 

 forwardly-directed lamellae, whose broad summits nearly equal 

 their interstices. The lamellae are smooth and glossy, but the 

 interstices are distantly spirally striated. Aperture complete 

 circular. Height, - 6 ; maj. diam, 1*25; min. diam, 0'85 mm. 



Several specimens. The species has a general resemblance to 

 L. capitata, Hedley, from which the denser varices of L. petalifera 

 at once separate it. 



