SuTER. — On N.Z. Land and Fresh-ivater Shells. 85 



very slowly increasing, rounded, the last not descending. 

 Suture deep. Aperture slightly oblique, rotundly - lunar, 

 somewhat excavated by the penultimate whorl. Peristome 

 straight, acute, tapei'ing ; columellar margin straight, not re- 

 flected. Umbilicus broad, perspective, showing all the whorls, 

 about one-third of the diameter. 



Diameter, 0-12in. (3mm.) ; height, 0-OGin. (l-5mm.), 



Hab. Under rotten wood, dead leaves, and amongst mould 

 in the subalpine bush. Very scarce. South Island : White 

 Horse Hill, and foot of Sealy Eange, Hooker Valley. (H. S.) 



This species seems to be closely allied to Helix eastboiirn- 

 cnsis, Beddome and Petterd, from Tasmania, but in the 

 latter the ribs on the upper surface are nearly straight, not 

 arcuated ; the spire is more elevated and not flat, and the 

 umbilicus rather narrower and deeper. But there also occurs 

 £1 perfectly white and a darker streaked form. 



Animal. — Jaw finely striated, arcuated, not tapering, with 

 a slight median projection. 



Dentition : 16 — 1 — 16 ; laterals, about 7. Central tooth 

 rectangular, longer than broad, the reflexed portion tricuspid, 

 covering about one-third of the base, sides concave, median 

 cusp as long as the base, with a moderate cutting-point, lateral 

 cusps small. Laterals much the same as the central tooth. 

 The first marginals with an oblique reflexed portion and three 

 cutting-points, the outer ones rectangular, much broader than 

 long, some of them with four cutting-points, the last very 

 minute, toothless. 



Patula sterkiana, n. sp. Plate XVI., fig. 3, a, h, D, E. 



SUM subdiscoidal, depressed, umbilicated, grey-yellowish 

 with veiy irregular rufous streaks and dots, sometimes tessel- 

 lated or forming zig-zag lines ; not shining, rather solid, trans- 

 parent ; with very fine rib-like arcuated striae, directed 

 forwards on the surface, undulating on the side and straight 

 beneath. Eibs about 60 in the tenth of an inch (24 per rnm.). 

 Spire_ but little elevated, flat. Whorls 5^ to 6, slowly in- 

 creasing, rounded, the last slightly descending. Suture rather 

 deep. Aperture oblique. Innately subcircular, but little exca- 

 vated by the penultimate whorl. Peristome straight, acute, 

 tapering, margins slightly convergent, columellar margin ar- 

 cuated, very little expanded. Umbilicus moderate, deep, about 

 one-fourth of the diameter. 



Diameter, 0-16in. (4mm.) ; height, 0-08in. (2mm.). 



Ilah. Under dead leaves and rotten wood in the sub- 

 alpine bush. South Island : White Horse Hill, Hooker Valley. 

 (H. S.) 



This species is, in the form of the shell, allied to Patula 

 iapirina and P. infecta, but is much closer ribbed. 



