Muedoch and Suter. — Besults of Dredging. 299 



breadth of the costse, crossing over broad rounded spiral cords. 

 On the third whorl there are three spirals, which are supple- 

 mented on the following whorl by a faint thread below the 

 suture, and one between the first and second cord ; on the 

 last whorl there are two rather inconspicuous spiral threads 

 below the suture, followed to the periphery by five strong spiral 

 cords, the last three more prominent than the others ; on the 

 base there are five narrow equal and close-set spiral riblets, 

 and the umbilicus is margined by a stout beaded ridge. All 

 the spiral cords are strongly and sharply beaded by the longi- 

 tudinal sculpture. Colour greyish- white. Spire conoidal, with 

 a rounded apex. Nucleus globular, small, smooth, consisting 

 of one whorl ; the succeeding volutions show already distinct 

 radiate riblets and spiral threads. Whorls 4|, tabulate above, 

 flatly convex below the angulation of the shoulder ; base 

 slightly convex. Suture canaliculate. Aperture subcircular, 

 angled above, white, not nacreous inside. Outer lip sharp, 

 convex, margined by denticles on the outside, produced by the 

 spiral ridges. Inner lip spread as a fhin callosity over the 

 penultimate whorl and connecting the margins ; columella 

 regularly arched, sharp. Umbilicus wide, scalar, margined by 

 a strong beaded cord followed by two spiral ridges, beaded 

 by longitudinal riblets. Diameter : maximum, 4 - 3 mm. ; mini- 

 mum, 3 5 mm. Altitude, 3 "8 mm. 



Type in the Colonial Museum, Wellington. 



Obs. A few dead shells only. The shell used for descrip- 

 tion and the figures is no doubt not adult, as was evidenced 

 by fragments of a larger shell of the same species. The genus 

 has not been recorded from New Zealand before. 



51. Minolia plicatula, n. sp. Plate XXVI, figs. 47-49. 



Shell small, orbicular, widely umbilicate, thin and fragile, 

 whitish with radiate purple streaks, longitudinally plicate above, 

 and spirally ribbed. Sculpture : There are rather distant 

 oblique radiate plications extending on the body-whorl to the 

 periphery only ; these as well as the interspaces are very finely 

 longitudinally striate. On approaching the umbilicus equidis- 

 tant straight broad and flat riblets are formed, slightly beading 

 the revolving cords. The penultimate whorl has two spiral 

 ridges close together, flatly beaded by the radiate plications, 

 and two some distance down towards the suture. On the last 

 whorl are two spiral cords, somewhat removed from the suture, 

 followed by a smooth interstice and three spiral ridges with 

 grooves of their own width between them ; five narrower cords 

 follow from the periphery to the umbilicus, the grooves between 

 which are first narrow, then getting broader ; there is a double 



