LagncUlus.} GASTROPODA. 181 



plaits, often produced below the suture, about 11 or 12 per millimetre 

 on the last whorl ; interstices with numerous fine but distinct spiral 

 stria?. Colour rufous, with a pale band on the periphery, or horny 

 with a brown peripheral band. Epidermis thin, horny. Spire conical, 

 apex rather blunt, higher than the aperture. Protoconch papillate, of 

 2 very convex, smooth whorls, the second with a few radiate striae. 

 A magnifying - power of about 100 reveals faint spiral striation. 

 Whorls 6, first regularly and slowly, the last rapidly increasing ; base 

 convex. Suture impressed. Aperture, oblique, subcircular. Peristome 

 simple, straight, strengthened inside by a narrow callosity ; notch at 

 the suture slight but distinct. Columella arcuate, with a white cal- 

 losity inside, which extends over the body, uniting the converging 

 margins. Umbilicus narrow, pervious, partly covered by the slight 

 columellar expansion. Operculum unknown. 



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



Dentition unknown. 



Type in my collection. 



Hob. Near Manaia, Wairnate Plains, North Island (R. Murdoch). 



6. Lagochilus Hedleyi, Suter, 1894. Plate 35, fig. 4. 



Lagochilus Hedleyi, Suter, P.L.S. N.S.W. (2), viii, 184, pi. 22, f. \-\d, 



Shell very small, turbinate, perforated, rather thin. Sculpture 

 consisting of radiate white membranaceous plaits, close together on 

 the penultimate whorl, but gradually getting more distant on ap- 

 proaching the aperture, where there are about 9 plaits per millimetre. 

 Between the plaits a good lens reveals close fine spiral stria?, crossed 

 by equally fine growth-lines. Colour rufous or pale horny. Epi- 

 dermis thin, not shining, easily rubbed off. Spire conical, nearly as 

 high as broad, a little higher than the aperture. Protoconch small, 

 papillate, of 2 whorls, the first smooth, the second microscopically 

 spirally striate. Whorls 5, rounded, the last rapidly increasing, 

 rounded at the periphery ; base convex. Suture deep. Aperture 

 nearly circular, diagonal. Peristome simple, straight, slightly callous 

 inside, the margins approximating and united by a thin parietal callus ; 

 notch at the suture very slight. Columella arcuate, callous inside, 

 not reflexed. Umbilicus pervious, very narrow, deep, partly hidden 

 by the last whorl. Operculum horny, slightly concave, of few whorls 

 only, nucleus central. 



Diameter Maj., 2 mm. ; min., 1-75 mm. : height, 2-25 mm. 



Dentition unknown. 



Type in my collection. 



Hab. North Island only : Hunua Range, type (Major Broun) : 

 Hillyer's Creek, near Auckland (C. Musson) ; Birkenhead (H. S.) ; Wai- 

 takerei Range (H. S.) : Mount Pirongia (A. T. Urquhart). 



