734 UASTROPODA. [Pnlmonata. 



fragile, mouth with 2 lamella*. Sculpture of the post-nuclear whorls 

 consisting of distant obliquely retractive membranous plaits, about 

 6 per millimetre, which are produced into a tooth-shaped membrane 

 below the suture ; a second row of cilia; is to be found on the keel 

 of the body-whorl, but they have mostly been rubbed off ; interstices 

 with fine growth -lines. Colour pale-horny, without markings. Spire 

 elevated, first cylindrical, then dome-shaped. Protocotwh of 1^ smooth 

 whorls, conic. Whorls 6. the first three very slowly increasing and 

 flat, the others convex at the upper half, lightly concave below ; the 

 last keeled below ; base almost flat. Suture not much impressed. 

 Aperture transverse, squarish, with 2 lamellae 1 slender long lamella 

 on the middle of the outer lip and a similar one in the angle formed by 

 the meeting of outer and basal lip. Peristome thin, acute, strengthened 

 within by a white thin callus. Outer lip sinuate ; basal lip slightly 

 arched. Columella vertical, almost straight. Inner lip callous, 

 slightly expanded, extending as a thin white callus over the flattish 

 parietal wall. Perforation very narrow, open, sometimes partly hidden 

 by the expansion of the inner lip. 



Diameter, 1-75 mm. ; height, 2 mm. 



Jaw and radula very much the same as in L. Ichiuniias. Formula 

 of radula 15+1+15. 



Type in my collection. 



Hob. North Island: Wade (Strickland); Kaiti, Gisborne (A. 

 Hamilton) ; Toko, Stratford ; Eusthall, Wanganui. type (R. Mur- 

 doch) : Rissington. Hawke's Bay (Hutchinson). 



2. Laoma elegans, Suter, 1896. Plate 10, figs. 7, l<i. 

 Lamna elegans, Suter, P. Mai. S., ii, 1896, 35, pi. 4, f. 11, 12. 



Shell minute, conoidal, perforate, horny, without colour-markings, 

 somewhat glossy, thin, transparent, surface radiately costate. Sculp- 

 ture of the post - embryonic whorls formed by fine low rounded 

 obliquely retractive riblets, about 15 per millimetre, extending on the 

 body-whorl to the angle of the periphery, leaving the base smooth. 

 (Colour horny, base whitish. Spire dome-shaped, about 1J times the 

 height of the aperture. Protoconch of 1| smooth and convex whorls, 

 the nucleus large. Whorls 5, flatly rounded, gradually and slowly in- 

 creasing, body-whorl sharply angled at the periphery ; base flatly 

 convex. Suture impressed. Aperture transverse, crescentic, with 6 

 long and slender lamellse, 2 on the penultimate whorl and 4 on the 

 base, the latter lying far back, and visible only from below through 

 the transparent wall of the shell as white concentric lines. Peristome 

 straight, acute. Basal lip broadly rounded. Columella short, slightly 

 oblique. Inner Up lightly callous, reflexed. Perforation very narrow, 

 pervious, open. 



Diameter. 2 mm. ; height. 1-5 mm. 

 unknown. 



