Murdoch. — Additions to Marine Mollusca of N.Z. 225 



Heads ; also Takapuna, Manukau, Kawhia, and New Ply- 

 mouth. 



This little shell occurs in fair numbers. It is nearest to the 

 preceding species ; distinguished by the minute irregular spiral 

 grooves, or their frequent absence except on the anterior end. 



I may mention that Pyrene flexuosa, Hutton (dark form), 

 is quite different in contour from the above : it has the form of 

 C. choava, Eeeve, and is probably only a colour variety of that 

 extremely variable species. 



Columbella saxatilis, n. sp. Fig. 15. 



Shell small, ovate-elongate, sculptured with fine spiral and 

 stronger longitudinal riblets. Colour light or dark brown, usually 

 a pale band around the periphery. Whorls 6, rather flattened. 

 Protoconch of two whorls, smooth and polished. Last whorl 

 comparatively large. Sutures impressed. Sculpture : Longi- 

 tudinal ribs sixteen to eighteen on a whorl, low and rounded, 

 equal to or a little less than the breadth of the interspaces, be- 

 coming obsolete on the anterior end and usually on approaching 

 the outer lip. Spirals undulating, small but well marked, wider 

 than the grooves ; on the penultimate six or seven, and on the 

 last sixteen to seventeen, about seven of which are in front of the 

 aperture ; on crossing the longitudinals they have occasionally 

 a somewhat granular appearance. Aperture somewhat narrow, 

 longer than the spire. Outer lip rather flattened, a little thickened, 

 and occasionally a few obscure denticles thereon. Columella 

 frequently with two or three small folds or tubercles, the beak 

 lightly twisted to the left ; canal short and broad. Length, 

 5'86 mm. ; breadth, 2*73 mm. 



Type in the Colonial Museum. 



Hob. Takapuna, from sand in rock-pockets (E. M.) ; Plim- 

 merton, Cook Strait. 



This species is perhaps nearest to C. pisaniopsis* Hutton, a 

 Pliocene form. 



Crossea glabella, n. sp. Figs. 16, 17. 



Shell minute, turbinate, smooth and rather solid. Colour 

 white, somewhat shining. Whorls 3, without sculpture. Spire 

 minute. Sutures distinct, not deep, with a narrow slightly 

 concave depression below and adjoining. Base with broad de- 

 pression, bounded by a prominent ridge ; a second ridge arises 

 from the narrow deep umbilicus ; both sweep round to the 

 anterior lip, where they form small well-marked expansions. 

 Aperture subcircular. Inner lip reflected and callused, the latter 



* Trans. N.Z. Inst., vol. xvii., p. 314 ; Macleay Mem. Vol., p. 45, 

 pi. vi., fig. 17. 



15 — Trans. 



