Rissoina.] GASTROPODA. 221 



4. Rissoina zonata, Suter, 1909. Plate 13, fig. 11. 



Rissoina zonata,, Suter, P. Mai. S., viii, 1909, 253, pi. 11, f. 1. 



Shell rather large, oblong, imperforate, indistinctly axially costate 

 and minutely spirally lirats, body-whorl usually with a brown zone. 

 Sculpture consisting of somewhat indistinct axial riblets, about 14 on 

 the last whorl, and very fine microscopic spiral striae. Colour white, 

 usually with a chestnut spiral band, beginning narrowly on the pen- 

 ultimate whorl above the suture and broadening very rapidly on the 

 body-whorl, but leaving the base white. Spire high, about twice 

 the. height of the aperture ; outlines somewhat convex. Protoconch 

 with a flat nucleus. Whorls about 7, lightly convex and somewhat 

 flattened below the suture; base flattish. Suture not much im- 

 pressed. Aperture semicircular, oblique, angled above, channelled 

 below. Outer and basal lip regularly arched, thick, with a rounded 

 edge. Columella very short, slightly twisted, and turned to the left, 

 forming a distinct short channel with the slightly effuse basal lip. 

 Inner Up very thick, connecting the margins over the slightly ex- 

 cavated parietal wall. Operculum unknown. 



Diameter. 4| mm. ; height, ll^mm. Diameter, 5mm.; height, 

 101 mra . 



Animal unknown. 

 Type in my collection. 

 Hab. Bay of Islands (J. C. Anderson). 



Remark. All the specimens at my disposal are beach-worn, and 

 the axial sculpture mostly effaced. 



Sect. 2. MCERCHIELLA, Nevill, 1884. 

 Mcercliiella, Nevill, Hand List Ind. Mus., 73. Type : R. gigantea, Deshayes. 



Upper part of shell axially ribbed, lower part smooth or spirally 

 striate. 



5. Rissoina carnosa, Webster, 1905. Plate 13, fig. 12. 



Rissoia carnosa, Webster, T.N.Z.I., xxxvii, 1904 (1905), 278, pi. 9, f. 6. 



Shell very small, elongate-oval, imperforate, thin. Sculpture con- 

 sisting of slightly oblique straight axial riblets, about 20 on the pen- 

 ultimate whorl, absent on the first 2 whorls and getting obsolete on the 

 body-whorl, crossed by fine spiral lirae which diminish in strength 

 toward the apex. Colour flesh-brown, with a cream-coloured band 

 above the periphery, some specimens being a darker brown without 

 the band, others having the last whorl entirely cream-coloured. Spire 

 elevated conic, higher than the aperture, outlines slightly convex. 

 Protoconch of 2 smooth, convex whorls, dome-shaped and dark. 

 Whorls 5|, the last proportionately large, slightly convex ; base 

 rounded. Suture moderately impressed. Aperture oblique, oval, 

 angled above ; the spiral sculpture plainly visible when looked at 



