730 GASTROPODA. [Pulmonata. 



Sculpture of the post-embryonic whorls formed by fine sharp and 

 equidistant riblets, about 15 per millimetre ; they are protractive 

 above, arcuate on reaching the periphery ; interstices with micro- 

 scopic growth-lines reticulated by spiral lirre. Colour light-horny, 

 with very faint broad radial streaks of darker horny. Spire deeply 

 concave, sunk to about one-third the height of the shell. Protoconch 

 smooth and shining, of 1|- convex turns. Whorls 4, convex, the inner 

 ones narrowly rolled up, the last largely developed, occupying about 

 two-thirds of the diameter of the shell, the inner side very rapidly 

 ascending and angled above ; periphery and base rounded. Suture 

 canaliculate. Aperture lunate, rather narrow, vertical. Peristome 

 straight, acute, upper margin narrowly arcuate, (.'oluinelln short, 

 arcuate. Inner lip not thickened and not reflexecl ; parietal wall 

 with a broad white and thin callus. Umbilicus moderately broad, 

 deep, perspective, its diameter about one-third that of the shell. 



Diameter, 2-7 mm. ; height. 1-5 mm. 



Animal unknown. 



Type in my collection. 



flab. North Island : Forty-mile Bush, type (H. S.) ; Mount 

 Pirongia (Urquhart). 



Remark. The specimens of this very rare shell which I have do 

 not seem to be adult. 



35. Endodonta Moussoni, Suter, 1890. Plate 29, figs. 2, a, b. 



Diplomphahis Moussoni, Sut., T.N.Z.I., xxii, 1889 (1890), 227, pi. 15, 

 f. 12, a, b. Patula Moussoni, Sut., T.N.Z.I., xsiv, 273. P. (Charopa) 

 Moussoni, Sut. : Pilsbry, Man. Conch. (2), viii, 105, pi. 19, f. 46-48. 

 Charopa Moussoni, Sut. : Heclley and Suter, P.L.S. N.S.W. (2), vii, 

 658. Endodonta (Clwropn) Monssoni, Sut., .1. de Conch., xli, 270. 



Shell small, discoidal with a concave spire, whitish with light-brown 

 streaks, sharply and not very closely radially ribbed, faintly shining, 

 thin, semitransparent. Sculpture consisting on the post-nuclear whorls 

 of protractive equidistant sharp riblets, 7 to 9 per millimetre ; they 

 are arcuate toward the periphery, thence straight but slightly ftexu- 

 ous ; interstices with numerous fine growth-lines and indistinct micro- 

 scopic spiral striae. Colour whitish, with light-brown streaks following 

 the direction of the ribs. Spire concave, sunk to about one-quarter 

 the height of the shell. Protoconch of 1| whorls, convex and smooth, 

 nucleus large. Whorls 4, the first three very narrow, the last high 

 and broad, two-thirds of the diameter of the shell, rapidly ascending 

 on the inner side, lightly angled above ; periphery and base rounded. 

 Suture canaliculate. Aperture lunate, higher than broad, narrow 

 above. Pcri^tmne acute, simple, retracting toward the suture and 

 slightly advancing above the periphery, ('nlnmclld oblique, arcuate. 

 Inner lip thin and sharp, not reflexed ; parietal wall with a thin white 

 callosity. Umbilicus moderately wide, about one-quarter of the 

 greatest diameter, perspective. 



