Murdoch. — Additions to Marine Mollusca of N.Z. 227 



whorls and greater number, deeper sutures, irregular sculpture, 

 and comparatively longer spire. It appears to be equally dis- 

 tinct from 0. fasciata* Hutton, a Pliocene form. 



Odostomia vestalis, n. sp. Fig. 20. 



Shell small, slender, fragile, smooth, and having a some- 

 what loosely coiled appearance. White and shining. Whorls 6, 

 lightly convex ; the last longer than the spire ; apical whorl 

 heterostrophe, slightly obliquely tilted. Sutures impressed, 

 shallow and lightly submargined. Sculptured with minute 

 irregular growth-lines, crossed by irregular microscopic striae, 

 the latter only indicated here and there. Aperture pyriform ; 

 columella lightly reflected, the plait small, rather deep within 

 the aperture ; anterior lip lightly effuse. Length, 4*31 mm. ; 

 breadth, 1"63 mm. 



Type in the Colonial Museum. 



Hab. Whangaroa Harbour (Mr. A. Hamilton). 



This form, of which there is but a single example, is nearest 

 to the preceding species ; .distinguished by its more slender form, 

 more shallow sutures, less rounded whorls, and more rapidly 

 lengthening or loosely coiled appearance. 



Odostomia (Pyrgulina) rugata, Hutton. 

 Odostomia (Parthenia) plicata, Hutton (not of Montford), Trans. 

 N.Z. Inst., vol. xvii., p. 319, pi. xviii., fig. 17 (1884, issued 

 May 1885). Odostomia rugata, Hutton (nom. mut.), Trans. 

 N.Z. Inst., vol. xviii., p. 353 (1885, issued May 1886) ; 

 " Macleay Memorial Volume," p. 58, pi. vii., fig. 51. 



This species has hitherto been recorded only as a Tertiary 

 fossil. Pliocene : Wanganui and Petane. Found also in the 

 Pareora system. It appears to be rare, both fossil and recent. 

 Of the latter I have seen but three examples, and not in very 

 good condition. I may add — the shell is white, somewhat shin- 

 ing and rather solid ; the longitudinal riblets strong, slightly 

 oblique advancing, seventeen to eighteen on the last whorl, feeble 

 or obsolete on the anterior end ; spirally adorned with minute 

 dense stria?. Sutures impressed and lightly margined. Colu- 

 mella plait strong. Measurements (approx.) : Length, 2-76mm. ; 

 breadth, P28 mm. The fig. 51 in the " Macleay Memorial 

 Volume " shows the riblets on the spire- whorls sloping forward, 

 or advancing in a most marked manner. In the examples before 

 me the slope is certainly less than half that shown in this figure. 



Hab. Whangaroa Harbour, and Plimmerton, Cook Strait 

 (Mr. A. Hamilton) ; Takapuna (Rev. W. H. Webster). 



* Trans. N.Z. Inst,, vol. xvii., p. 320; Macleay Mem. Vol., p. 58, pi. vii., 

 fig. 50. 



