742 GASTROPODA. (Pulmonata. 



Type in my collection. 



Hob. North Island : Hunua Range (Major Broun) ; Mount 

 Pirongia (Urquhart) ; Rusth.aU, Wanganui (R. Murdoch) ; Seventy- 

 mile Bush (Chadwick) ; Mauriceville, type (H. S.). South Island : 

 Hooker Valley (H. S.). Found under dead leaves in mould, but 

 easily overlooked, and therefore apparently rare. 



Subsp. sericata, Suter. 1890. 



Hyalina allochroida, var. sericata, Sut., T.N.Z.I., xxii, 1889 (1890), 228, 

 pi. 15, f. 15, a, b. Laoma allochroida sericata, Sut. : Pilsbry, Man. 

 Conch. (2), viii, 64, pi. 23, f. 7-9. L. (Phrixgnathus) allochroida sericata, 

 Sut. : Hedley and Suter, P.L.S. N.S.W. (2), vii, 649 ; Suter, J. de Conch., 

 xli, 281. 



Shell minute, depressed, subperf orate, silky, with very fine radiate 

 riblets. corneous, thin, pellucid. Sculpture : Protoconch smooth, 

 microscopically spirally striate, the succeeding whorls with fine and 

 close radial riblets, 25-30 per millimetre ; they are obliquely retractive 

 and slightly undulating over the periphery. Spire low, broadly con- 

 vex. Protoconch of 1J whorls, flatly rounded. Whorls 5, slowly and 

 regularly increasing, narrow, rounded ; base and periphery convex. 

 Suture deep. Aperture oblique, lunate, higher than broad. Peri- 

 stome straight, acute, upper margin somewhat advancing. Columetta 

 short. Inner lip not reflexed. Perforation very narrow, open. 



Diameter, 1-2 mm. ; height, 0-7 mm. 



Animal unknown. 



Type in my collection. 



Hob. North Island : Mount Pirongia (Urquhart) ; Seventy-mile 

 Bush (Chadwick) ; Forty-mile Bush, type (H. S.). Found in mould, 

 but very easilv overlooked. 



/ */ 



5. Laoma Ariel, Hutton, 1883. Plate 29, fig. 8. 



Phrixgnathus Ariel, Hutt., N.Z.J.S., i, 1883, 476 ; T.N.Z.l, xvi, 177, 196. 

 Laoma Ariel, Hutt., Man. Conch. (2), viii, 59. L. (Phrixgnathus) Ariel, 

 Hutt. : Hedley and Suter, P.L.S. N.S.W. (2), vii, 647 : Suter, J. de 

 Conch., xli, 278. 



Shell very small, depressed turbinate, .subperf orate, scarcely 

 shining, finely ribbed, thin, corneous, with radial brown streaks. 

 Sculpture of the post-nuclear whorls consisting of fine oblique radial 

 rib-striae, about 10 per millimetre, often somewhat indistinct, the 

 interstices with fine growth-lines and rather indistinct fine microscopic 

 spiral lines, a little more distinct on the base. Colour corneous, 

 usually with radiate zigzag streaks of fulvous. Spire conoidal, de- 

 pressed, a little higher than the aperitive; outlines lightly convex 

 Protoconch of 1| smooth flattish whorls. Whorls 5, slowly increasing, 

 tiatly rounded ; periphery more or less distinctly angled, base convex. 

 Suture impressed. Aperture oblique, lunate. Peristome thin, acute, 

 slightly callous within, outer lip angled. ( 'olumella very short, arcuate. 



