722 GASTROPODA. [Pulmonata. 



24. Endodonta Sterkiana, Suter, 1891. Plate 9. figs. 20, a, b. 



Patula Sterkiana, Sut., T.N.Z.I., xxiii, 1890 (1891), 85, pi. 16, f. 3, a, b, 1), E. 

 P. (Charopa} Sterkiana, Sut. : Pilsbry, Man. Gorich. (2), viii, 101, pi. 19, 

 f. 28-30. Charopa Sterkiana, Sut. : Hedley and Suter, P.L.S. N.S.W. 

 (2), vii, <i5<>. Endodonta (Charopa) Sterkiana, Sut.. J. de Conch., 

 xli, 270. 



Shell small, subdiscoidal, umbilicated, yellowish-grey, with, faint 

 fulvous markings, very finely and closely radially ribbed, not shining, 

 rather solid, semitransparent. Sculpture : Protoconch with very fine 

 radiate striae, which on the following whorls are becoming very oblique 

 and a little more -distant, protractive on the upper surface, almost 

 straight but flexuous on the periphery and base, 20 to 24 per milli- 

 metre ; the interstices with a few growth-lines and microscopic dense 

 spiral lines passing over the riblets. Colour yellowish-grey with very 

 irregular light-brown streaks and dots, sometimes tessellated or form- 

 ing zigzag lines. Spire but little elevated, flattish. Protoconch of 1| 

 convex turns. Whorls 5, slowly increasing, convex, the last slightly 

 descending, periphery and base rounded. Suture well impressed. 

 Aperture oblique, rotundly lunate. Pcristome thin and sharp, retract- 

 ing at the suture, and forming a rather deep sinus. Columella vertical, 

 arcuate, short. Inner 1i/> somewhat callous, not reflexed ; parietal 

 wall with a thin shining broad callosity. Umbilicus moderate, deep, 

 showing all the whorls and the nucleus, about one-fourth of the greatest 

 diameter. 



Diameter Maj., 3-8 mm. ; min., 3-5 mm. : height, 2 mm. 



Jaw arcuate, not tapering, finely vertically striated, with a slight 

 median projection. 



Radula having the formula 12 + 4+1 + 4+12. Central tooth tri- 

 cuspid, the mesocone reaching to the posterior margin of the base. 

 Laterals much like the central. Marginal teeth with 3 cutting-points, 

 the ectocone shorter. 



Type in my collection. 



Hub. South Island : Birch Hill Station. Nelson (E. Suter) ; White 

 Horse Hill, Hooker Valley, type (H. S.). 



Forma major, Suter, 1892. 



Patula Sterkiana, forma major, Sut., T.N.Z.I., xxiv, 1891 (1892), 295. 



The shell differs from the species only in its larger size, and an 

 occasional additional half-volution. Specimens from Queenstqwn have 

 only 14 riblets per millimetre, but otherwise there is no difference 

 from the type. 



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



Type in my collection. 



Hab. South Island : Owaka, type (J. T. Bryant) ; The Nuggets, 

 Port Molyneux (A. Hamilton) ; Queenstown (Captain Hutton) : 

 Fortro.se (Miss Rich). 



