SUTER : NEW ZEALAND KISSOIID^. d 



young specimens the riblets are continued below the spiral thread to 

 the umbilical region. Aperture vertical, rotundly ovate, continuous, 

 outer and basal margins sharp, columella somewhat thickened, rufous, 

 rather concave, subtruncate at the base. Operculum not seen. 

 Long. 2-5, lat. r5mm. 



Hah. — Lyall Bay, near Wellington. It was found by Mr. A. 

 Hamilton of Dunedin, whose name I have much pleasure in uniting 

 with the species. 



Type in my collection. 



Subgen. Saban^a, Leach, 1847. 



3. RrssoiA incidata (Frauenfeld). 



Salancea incidata, Frauenfeld : I^ovara-Exped., Zool. vol. ii, MoUusca, 



p. 12, pi. ii, fig. 29. 

 Rissoia {Sahancea) incidata, Frauenfeld : Tryon, Man. Conch., ser. i, 



vol. ix, p. 339, pi. Ixiii, fig. 65. 



Shell conoidal, thick, smooth, brownish ; whorls 5, flattened, suture 

 and periphery channelled ; lip thickened. 



Hal. — Botany Bay (Frauenfeld). 



I found several specimens of this interesting little shell on sea- 

 weeds at Te Onepoto, near Sumner. The length of my specimens 

 is r25 mm. ; Frauenfeld gives l'4mm. 



4. ElSSOIA ANNIJLATA, Hutton. 



Rissoa annulata, Hutton: JSTew Zealand Journ. Science, vol. ii (1884), 

 p. 173 ; Proc. Linn. Soc. ISTew South Wales, vol. ix 

 (1885), p. 940; Macleay Memorial Yolume (1893), p. 65, 

 pi. viii, fig. 67. 



Shell ovate, smooth, brown, often with a paler band just below 

 the suture; whorls 5, slightly rounded, suture well-marked; aperture 

 rounded, continuous in the adult. The operculum is corneous and 

 paucispiral, without any internal process. Specimens from Lyttelton 

 measure : long. 2-25, lat. 1*25 mm. 



Hah. — Auckland ; Lyttelton, under stones between tide-marks ; 

 Pliocene of Wanganui and Petane (Hutton). 



Type in the Canterbury Museum, Christchurch. 



The species may be distinguished from R. suhfusca by its shape and 

 more strongly marked suture. 



Yar. minor, n.var. 



Smaller than the typical form, suture more impressed, polished. 

 Long. 1-5, lat. ■75 mm. 



Hah. — Foveaux Strait (A. Hamilton). 

 Type in my collection. 



