292 GASTROPODA. [Pectinibranchia. 



and broader upon the base. Colour light-yellowish or white. Spire 

 very low, arched, with the apex a little raised, less than one-third the 

 height of the aperture. Protoconch consisting of 2J smooth flattish 

 whorls. Whorls 4|, first slowly increasing, but the last very large, 

 flatly convex ; base convex. Suture impressed. Aperture ovate, 

 rather produced anteriorly. Outer Up convex, thin and sharp, slightly 

 produced in the middle. Parietal wall and columella together are 

 S-shaped. Columella vertical, arcuate, curved off towards the slightly 

 convex basal lip. Inner lip spreading as a fairly thick callus beyond 

 the columella, covering up the umbilicus, and extending over the 

 parietal wall. Operculum unknown. 



Diameter, 21 mm. ; height, 21 mm. (type). 



Animal unknown. 



Type, from the Pliocene, in the Canterbury Museum, Christchurch. 



Hob. Cape Maria van Diemen (teste Webster). 



Remarks. I have seen no Recent specimen. The description is 

 made from a fossil shell from Wanganui. 



Fossil in the Pliocene. 



2. Ampullina venusta, Suter, 1907. Plate 15, fig. 18. 



Euspira venusta, Suter, P. Mai. S., vii, No. 4, March, 1907, 215, pi. 18, f. 13. 



Shell large, globose, white, imperf orate, with 2 low spiral ribs 

 round the umbilical region. Sculpture consists of close, unequal, 

 spiral, slightly wavy lines, which are crossed by subequidistant fine 

 growth-lines, interspersed with distant strong and flexuous radial 

 folds, very likely marking periods of rest. Colour light bluish-white, 

 porcellanous. Spire conoidal, about a quarter the height of the 

 shell. Protoconch depressedly globose, formed by 2| smooth and 

 convex whorls. Whorls 5|, first slowly then rapidly increasing, con- 

 vex, the last whorl very large and rounded ; base convex ; 2 low 

 and broadly rounded ribs encircling the umbilical region, the outer 

 rib beginning at the lower third of the penultimate whorl and ter- 

 minating at the junction of the outer with the basal lip. Suture not 

 deep, on the last H whorls with a milk-white broad inferior band. 

 Aperture large, broadly ovate below, much excavated above by the 

 penultimate whorl. Outer lip broadly rounded, thin and sharp. Inner 

 lip spreading as a thin and broad callus over the body- whorl, but 

 forming a thick white and shining callus on the concave columella ; 

 the columellar border and parietal wall regularly S-shaped. Basal lip 

 narrowly rounded, not produced. The columella does not form a 

 vertical solid pillar, but is wound up in a spiral, leaving, a free space, 

 of about 3 mm. diameter at the base, up which the apex can be seen. 

 Operculum unknown. 



Diameter, 37 mm. ; height, 40 mm. 



Animal unknown. 



Type in my collection. 



Hob. Near Cape Farewell. 



