716 GASTROPODA. [Pulmonata. 



riblets, slightly retractive toward the periphery, 10-12 per millimetre, 

 those on the protoconch closer together ; interstices with a few growth - 

 lines, crossed by fine dense microscopic spiral lines. Colour pale- 

 horny. Spire hardly raised, flat. Protoconch of 1^ convex turns. 

 Whorls 3| to 4, the last more rapidly increasing than the others, convex, 

 periphery and base rounded. Suture impressed. Aperture a little 

 oblique, rotundly lunar. Peristome simple, straight, margins con- 

 verging. Columella vertical, short, arcuate. Inner lip not reflexed ; 

 parietal wall with a broad shining glaze. Umbilicus moderately wide, 

 gradate, diameter 0-8 mm. 



Diameter Maj., 1-75 mm. ; min., 1-5 mm. : height, 0-7 mm. 

 (type, 3J whorls). Diameter Maj., 2-8 mm. ; min., 2-5 : height, 

 1-3 mm. (specimen, 4 whorls). 



Dentition. Suter, T.N.Z.I., xxvi, 128, pi. 16, L 15, 16. 



Jaw membranous, distinctly vertically striated. 



Radula with the formula 12 + 4+1 + 4+ 12. Central and 

 lateral teeth tricuspid, with a long mesodont ; marginals with 3 to 4 

 cutting-points. 



Type in the British Museum. 



Hob. North Island : From North Cape to Wellington. South 

 Island : Kenepuru ; Stonyhurst ; Kowai Bush ; Riccarton Bush ; 

 Dyer's Pass ; Little River ; Akaroa ; Mount Somers. 



16. Endodonta Colensoi, Suter, 1890. Plate 28, figs. 7, a, b. 



Patula Colensoi, Sut., T.N.Z.I., xxii, 1889 (1890), 225, pi. 14, f. 7, a, b. 

 P. (Charopa) Colensoi, Sut. : Pilsbry, Man. Conch. (2), viii, 99, pi. 19, 

 f. 16-18. Charopa Colensoi, Sut. : Hedley and Suter, P.L.S. N.S.W. (2), 

 vii, 657. Endodonta (Charopa) Colensoi, Sut., J. de Conch., xli, 269. 



Shell small, discoidal, umbilicate, rather solid, faintly shining, 

 closely radially ribbed, horny with zigzag streaks of fulvous. Sculp- 

 ture consisting of close sharp radial riblets, about 10 per millimetre, 

 straight on the protoconch, protractive on the succeeding whorls, al- 

 most straight on the periphery and base ; interstices with fine growth- 

 lines and microscopic spiral lines passing also over the riblets. Colour 

 yellowish-grey, with zigzag streaks of fulvous, sometimes flowing 

 together. Spire flat. Protoconch of li convex turns. Whorls 5, 

 slowly increasing, convex ; periphery and base rounded. Suture deep. 

 Aperture slightly oblique, roundly lunate. Peristome thin and sharp, 

 retracting towards the suture, and forming a deep sinus. Columella 

 vertical, arcuate. Inner lip very slightly thickened, not reflexed ; 

 parietal wall with a thin broad shining glaze. Umbilicus broad, 

 perspective, about one-third of the greatest diameter. 



Diameter -Maj., 4-2 mm. ; min., 3-5 mm. : height, 2-25 mm. 



Dentition. Suter, T.N.Z.I., xxiv, 293, pi. 21, f. 26, 27. 



Jaw arcuate, very thin, not tapering, distantly and faintly verti- 

 cally striated. 



