MOLLUSCA — HEDLEY AND MAY. 117 



ElSSOA COLUMNABIA, Sp.Tior. 



(Plate xxii., fig. 9). 



A " Rissoa " of the group of R. bicolor, Petterd. Small, glossy, 

 subcylintlrical, summit blunt. Whorls six, divided by impressed 

 sutures. Colour variable, red, purple, or orange on the apex, 

 fading on the lower whorls ; the last usually white, with a pale 

 narrow median yellow band. Sculpture : tine close radial hair 

 lines. Aperture perpendicular, circular, peristome reflected all 

 round. Length, 2*6; breadth, 1*1 mm. 



Several specimens. In colour, size, and form this approaches 

 Rissoa subfusca var. micronema, Suter, - from which it differs by 

 absence of spiral sculpture and mere slender shape. 



PiTSSOINA LINTEA, sp.HOV. 



(Plate xxiii , fig. 11). 



Shell elongate, turreted, thin, translucent, glossy. Colour 

 white. Whorls eight and a half, separated by a channelled suture, 

 first two smooth and dome-shaped. Sculpture : numerous close, 

 fine, spiral threads wind over the whole of each whorl. Last 

 whorl ascending at the aperture. Aperture effuse, not provided 

 with a varix, anterior canal well marked, columella arched and 

 broadly reflected on the body whorl. Length, 7 ; breadth, 

 2-5 mm. 



A few specimens. The lack cf radial sculpture at once 

 separates this from other spirally grooved Australian Ri88oince. 



RlSSOINA FAUSTA, Sp nov. 



(Plate xxii., fig. 10). 



Shell smooth, glossy, translucent, elongate, with impressed 

 suture. Colour pale cream, with orange spots disposed in five 

 rows, two of which ascend the spire. Whorls eight. Aperture 

 subtriangular, anterior notch distinct, columella thickened, arched, 

 outer lip slightly reflected, thickened within. Length, 65 ; 

 breadth, 1*5 mm. 



Several specimens. This is nearly related to R. lintea, but 

 differs in being smaller, coloured and smooth. 



2 Suter— Proc. Malacol. Soc., iii., 1898, p. 4. 

 9 



