GASTROPODA. 503 



convex, the base contracted. Suture well marked. Aperture slightly 

 oblique, oval, angled above, produced into an oblique short and 

 open canal, truncated below. Outer lip thin, sometimes strengthened 

 by the last axial riblet, with a shallow rounded infrasutural sinus. 

 Colu'iniila slightly concave above, convex and curved to the left below, 

 where it is drawn out to a fine point. Inner lip narrow and thin. 



Diameter, 5 mm. ; height, 14 mm. (type of D. amcena, Smith). 

 Diameter, 2-5 mm. ; height, 8-3 mm. (type of D. protensa, Hutt.). 

 Diameter, 4-9 mm. ; height, 12-5 mm. (specimen from Auckland). 



Animal unknown. 



Type of M. protensa, from the Pliocene, in the Canterbury Museum, 

 Christchurch ; of M. amcena, in the British Museum. 



Hob. Hauraki Gulf, to a depth of about 25 fathoms ; off Great 

 Barrier Island, in 110 fathoms ; Stewart Island ; Bay of Islands ; 

 near the Snares, in 50 fathoms (Captain Bollons) ; near Cuvier Island, 

 in 38 fathoms (Captain Bollons). 



Remarks. - - That M. protensa and amcena are one and the same 

 species I have not the least doubt. The figure is from the type speci- 

 men of M. amcena in the British Museum, which is an exceptionally 

 large example. As Mr. E. A. Smith's species has never been figured 

 before, I give precedence to Hutton's name. The specimen figured 

 in Plioc. M. has exceptionally flat whorls ; they are usually strongly 

 convex, and more or less distinctly shouldered. The size of the shell 

 is, as in M. Sinclairi, very variable, and so is also the development of 

 the sculpture. 



Fossil in the Pliocene. 



11. Mangilia quadricincta, Suter, 1908, Plate 22, fig. 6. 

 Mangilia quadricincta, Suter, P. Mai. S., viii, 1908, 187, pi. 7, f. 21. 



Shell very small, fusiform, thin and fragile, white, semitrans- 

 parent, turriculate, clathrate. Sculpture : The first whorl below the 

 smooth protoconch has a fine spiral cord on the sharp angle of the 

 shoulder, the following a second below the carina, and the bod} - 

 whorl has 4 cords, of which the two lower ones are close together 

 and in front of the upper part of the aperture ; they are crossed by 

 equidistant straight thin axial riblets, about 18 on the last whorl, 

 extending over the greater part of the base, the interspaces much 

 broader than the riblets and ornamented with very fine growth-lines. 

 Colour white. Spire conic, gradate, but little higher than the aperture. 

 Protoconch of 1| smooth convex whorls, the nucleus globose and 

 oblique. Whorls 4, shouldered and prominently keeled, straight 

 above and below the keel ; base contracted. Suture linear. Aperture 

 somewhat oblique, pyriform, very broadly angled above, with an 

 oblique, moderately long, open and truncated canal below. Outer 

 lip strongly convex, lightly angled above, contracted below, crenated 

 on the outside by the spirals, somewhat strengthened by the last 



