612 GASTROPODA. [Pulmonat". 



Shell moderately large, ovate, subperf orate, slightly striate. shining. 

 Sculpture consisting of very fine and close growth-lines only. Colour 

 yellowish-horny, olive, or fulvous. Epidermis thin, polished. Spire 

 t-levated, broadly conical, about two-thirds the height of the aperture : 

 outlines convex. Proloconch very small, globular, mostly somewhat 

 eroded. Whorls 4 to 5, convex, sloping below the suture, the last 

 high and ventricose, somewhat flattened in the middle, indistinctly 

 biangulate. Suture deep. Aperture ovate, angled above. Outer lip 

 broadly convex, thin and sharp. Bax<tl ///* narrowly rounded and 

 somewhat effuse. Columella vertical, straight, slightly twisted. Inner 

 lip narrow, but little reflexed, leaving a narrow umbilical chink : ex- 

 tending as a thin layer over the lightly convex parietal wall. 



Diameter, 9mm.; height, 17mm. Proportion of diameter to 

 height, 1 : 1-6. Proportion of diameter to height of aperture. 1 : 1-9. 

 Proportion of height of aperture to height of shell. 1 : 1-6. 



Animal unknown. 



Type in the K.K. Hofmuseum. Vienna. 



Hob. Lake Guyon. Nelson ; Lake Nga-tu. near Kaitaia (R. H. 

 Matthews). 



3. Isidora lirata, T.- Woods, 1879. Plate 24. fig. lit. 



Physa lirata, T.-Woods, P.L.S. N.S.W., iii, 138, pi. 13, f. 6; Hutton, 

 M.N.Z.M., 31 ; T.N.Z.I., xvii, 57. Isidora lirata, T.-Woods : Suter, 

 T.N.Z.I., xxxvii, 274. f. 6 (reversed) : xxxviii, pi. 19, f. 6. 



Shell rather small, imperf orate or rimate, elongately ovate, thin 

 and fragile, subdiaphanous. Sculjit-nn' consisting of distant fine 

 punctate spiral striae, crossed by undulating fine growth-lines. Colour 

 yellowish-horn, very often with a brown-ferruginous coating. Epi- 

 ilermis thin, transparent, very often produced into short light-brown 

 bristles on the carina of the whorls. Spire short, acute, its height a 

 little less than half that of the aperture. Proloconch minute, mostly 

 eroded. Whorls 3| to 4, the last very high and inflated, usually 

 strongly carinated, with a flat shoulder, but sometimes smooth and 

 convex ; base flatly convex. Suture lightly impressed. Aperture 

 elliptic or broadly semicircular, angled above. Outer lip convex, 

 thin and sharp. Basal Up narrowly rounded and much produced. 

 Columella slightly twisted, with a small fold above. Inner lip very 

 thin, narrowly reflexed over the upper part of the pillar, leaving usually 

 a narrow umbilical chink, spreading as a very thin glaze over the 

 Hattish parietal wall. 



Diameter, 5 mm. ; height, 10 mm. : aperture. 3 mm. by 5 nun. 

 (lype). Proportion of diameter to height, 1 : 2 to 1 : 1-7. Propor- 

 tion of diameter to height of apertiire. 1 : 1-7. Proportion of height 

 of aperture to height of shell, 1 : 2. 



Deii-tiHim (Suter. T.N.Z.I., xxxvii, 274, f. 6a). Central tooth bi- 

 cuspid, laterals Iricuspid. marginals serrate. 



