102 HKLIX-CIIAROPA. 



surface, undulating on the side and straight beneath. Ribs about 

 60 in the tenth of an inch (24 per mill.). Spire but little elevated,- 

 flat. Whorls 5-1 to 6, slowly increasing, rounded, the last slightly 

 descending. Suture rather deep. Aperture oblique, lunately sub- 

 circular, but little excavated by the penultimate whorl. Peristome 

 straight, acute, tapering, margins slightly convergent, columellar 

 margin arcuated, very little expanded. Umbilicus moderate, deep, 

 about one-fourth of the diameter. Diam. 4, height 2 mill. (Suter.) 

 South Island, N. Z. at White Horse Hill, Hooker Valley. 



P. sterkiana BUT., Tr. N. Z. Inst. 1890, xxiii, p. 85, t. 16, f. 3, a, 

 b (shell), f. D, E (jaw and dentition). P. sterkiana var. reeftonen- 

 sis and forma major SUT., Trans, xxiv, p. 294, 295. 



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

 and P. infecta, but is much closer ribbed. (Sitter.') 



Forma major. Somewhat larger than typical 8terk!<in<i. Alt. 

 2-1, diam. 4-1 mill. 



Oicaka (Clutha). 



Var. REEFTONENSIS Sut. 



Considerably smaller, with more distant ribs, of which there are 

 about 15 per millim. ; otherwise like the type. Jaw and radula 

 much as in the type form. At first sight this seems to be intermedi- 

 ate between sterkiana and brouni, but close examination shows it to 

 be more allied to the former, though the ribs are much coarser and 

 more distant. Alt. If, diam. maj. 2f, min. 21 mill. 



Boatman's, near Reef ton. 



P. BROUNI Suter. PI. 19, figs. 31, 32, 33. 



Shell minute, subdiscoidal, umbilicatcd, pale-horny with rather 

 distant dark-horny streaks, forming zig-/ag lines on the periphery 

 and beneath ; not shining, thin and fragile, transparent ; with very 

 fine and close ribs, nearly straight and directed forwards on the 

 upper surface, straight on the side and at the base ; about 60 in the 

 tenth of an inch (24 per mm.). Spire scarcely reaching above the 

 li>st whorl. Whorls 5, narrowly rolled up, slowly increasing, 

 rounded, the last not descending, suture impressed. Aperture 

 slightly oblique, rotundly lunar, but little excavated by the penul- 

 timate whorl. Margins regularly arched, convergent, straight, 

 acute, the outer lip slightly advancing. Columellar margin short 

 arcuated, not reflexed. Umbilicus broad, perspective, one third of 

 the diameter. Diam. 2'25, alt. 1 mill. (Suter.) 



