736 GASTROPODA. [Pulmonnta 



lamellae. Sculpture : The protoconch is on the last half-turn micro- 

 scopically spirally striated, with indications of radiate striae ; the fol- 

 lowing whorls are obliquely regularly striated, the striae extending 

 over the base ; above the suture there is a cord-like projection. 

 Colour corneous, closely striped with reddish undulating or zigzag 

 streaks, radiating on the base, oblique above. Spire conic, outlines 

 slightly convex. Protoconch of 1| whorls, the nucleus smooth, con- 

 vex. Whorls 6, flat, with the carina projecting along the suture ; 

 last whorl somewhat concave above and below the peripheral keel ; 

 base convex. Suture impressed, margined. Aperture somewhat ob- 

 lique, rhombic, with 1 strong spiral fold on the columella, 1 to 2 

 strong entering folds on the parietal wall, 1 on the cuter lip above 

 the periphery. Basal lip with a thick callosity only, or 1 to 3 short 

 lamellae on it. Peristome sharp, dark-edged. Columella short arcuate. 

 Inner lip thin, expanded. Perforation narrow, deep, open. 



Diameter, 3-5 mm. ; height, 2-3 mm. 



Dentition. Suter, T.N.Z.I., xxiv, 298, pi. 23, f. 41, 42. 



Jaw arcuate, with about 24 broad vertical plaits, which are strongly 

 papillate. 



Radula with the formula 110 x 30 + 1 + 30. Central tooth long 

 and narrow, with a short cusp. Lateral and marginal teeth bicuspid, 

 the inner cusp longer than the outer. 



Type in the Canterbury Museum, Christchurch. 



Hob. North Island : Remuera, Auckland, type (Cheeseman) ; 

 Waiwera ; Waiheke Island ; Thames ; Hillyer's Creek ; Mount 

 Wellington lava-fields ; Hunua Range ; Tuakau ; Tarukenga ; Mount 

 Pirongia ; Wanganui ; Seventy-mile Bush ; Forty-mile Bush ; Wai- 

 marama ; Wellington. South Island : Kenepuru. 



Forma albina. 



Perfectly white specimens from Auckland and the Hunua Range 

 are in my collection. 



5. Laoma pirongiaensis, Suter, 1894. Plate 29, fig. 5, a. 



Laama pirongiaensis, Suter, P.L.S. N.S.W. (2), viii, 1894, 491, pi. 22, f. 6-6fr ; 

 Suter, J. de Conch., xli, 275. 



Shell very small, conoidal, subpert'orated, horn-colour, with rather 

 distant membranous plaits, not shining, thin, semitransparent. Sculp- 

 ture : Protoconch with microscopic spiral lines ; succeeding whorls 

 with oblique membranous plaits, about 7 per millimetre ; interstices 

 with fine growth-lines, crossed by microscopic spiral striae, more dis- 

 tant and more conspicuous on the base. Colour horny, banded with 

 rufous, in zigzag lines on the last whorl, extending over base. Spire 

 conoidal, somewhat higher than the aperture ; outlines lightly con- 

 vex. Protoconch of 1 convex turns. Whorls 5|, slowly and regularly 



