28 PROCEEDINGS OF THE MALACOLOGICAL SOCIKTY. 



raised; the anterior, posterior, and lateral slopes are uneven, moderately 

 convex. Interior greenish-white ; muscular impression very distinct, 

 forming a semicircle. Length 2 8, breadth 2*5, height 2"2 mm. 



Hcib. — Near the Snares Islands, in 50 fathoms (Capt. Bollons). 

 Type in my collection. 



17. RissoA RDPOAPiCATA, u.sp. PL II, Fig. 21. 



Shell small, elongately oval, rimate, solid, costate, shining. Sculp- 

 ture : the embryonic whorls smooth, the succeeding ones closely ribbed, 

 the riblets at first faint and inconspicuous, then getting much stronger 

 as growth proceeds ; they are flat, close together, with smooth and 

 slightly narrower interstices, flexuous, nearly vertical on the upper 

 whorls, but obliquely directed backward on the last whorl, and ex- 

 tending over the base. Colour : the first two or three whorls are rufous 

 or purple, the following two dark grey, and the last whitish. Spire 

 elevated conical, two and a half times the height of the aperture ; out- 

 lines slightly convex. Protoconch. papillate, of two flatly convex whorls. 

 Whorls 6, regularly increasing, flattish ; base convex. Suture deep, 

 slightly uneven. Aperture oblique, ovate, white. Peristome con- 

 tinuous, much thickened and expanded. Columella very short, arcuate. 

 A distinct umbilical chink is formed by the reflection of the inner lip. 

 Operculum unknown. Diam. 1-9, height 4 mm. 



Hob. — Near the Snares Islands, in 50 fathoms (Capt. Bollons). 



In general appearance this species recalls R. suhfusca, Hutt., which, 

 however, is quite smooth. Type in my collection. 



18. RissoA (Alvania) exserta, n.sp. PL II, Fig. 22. 



Shell small, elongately oval, imperforate, thin, semitransparent, but 

 faintly shining, strongly axially costate and spirally striate. Sculpture 

 consisting of distant, stout axial riblets with a rather sharp edge, 

 ten to eleven on the upper whorls, twelve to fourteen on the body- 

 whorl, on which they vanish below the periphery ; the interstices and 

 riblets are crossed by distant spiral threads, about fourteen on the last 

 whorl ; they are closer together upon the base. Colour white ; in 

 fresh examples the apex pinkish-brown. Spire elevated conical, about 

 twice the height of the aperture ; outlines slightly convex. Protoconch 

 small, globular, of one and a half microscopically densely spirally 

 striate whorls. Whorls 4, the last large in proportion, flattened 

 below the suture, thence strongly convex ; base rounded. Suture 

 deep. Aperture subvertical, oval. Peristome continuous, tbickened 

 inside, sharp ; outer lip with a varix formed by the last axial riblet ; 

 basal lip slightly effuse. Columella oblique, short, sligbtly arcuate. 

 Operculum unknown. Diam. L3 to L6, height 2*2 to 2-8 mm. 



Hah. — Near the Snares and the Bounty Islands, in 50 fathoms 

 (Capt. Bollons). 



Allied to the Australian j5. devecta, Tate { = gracilis, Aug.), which, 

 however, has more numerous axial riblets. Type in my collection. 



19. EissoA (Onoba) foliata, n.sp. PL II, Fig. 23. 



Shell minute, turriculate, solid, opaque, white, spirally ribbed. 

 Sculpture : the first one and a half whorls are microscopically distantly 



