BY HENRY SUTER. 485 



The notch at the suture is very slight. Aperture nearly circular, 

 diagonal ; peristome simple, straight, slightly callous inside, the 

 margins approximating and united by a thin callus. Umbilicus 

 previous, very narrow, deep, open. 



Opercuhmi horny, slightly concave, a few whorls only, nucleus 

 central. 



Diam., greatest 2, least 1 j ; height 2 J millm. 



Anhnal unknown. 



Hah. — North Island : Hillyer's Creek, near Auckland (C. 

 Musson), Hunna Eange (Capt. T. Broun), Pirongia Mt. (A. T. 

 Urquhart). 



I have much pleasure in uniting the name of my friend Mr. C. 

 Hedley with this species. The two specimens collected by Mr. C. 

 Musson I first took for L. cytora, Gray, as they were very much 

 worn and had all the membranaceous plaits rubbed off. In 

 January of last year Capt. T. Broun kindly .sent me a number of 

 shells collected by him on the Hunna Range, and amongst them 

 I found two specimens of this new species in good condition. 



This species is very near L. cytova, Gray, but may be distin- 

 guished from it by the membranaceous plaits and the absence of 

 well developed distant spiral striations and epidermal hairs. 



Lagochilus torquillum, n.sp. 

 (PL XXII. figs. 2-26.) 



Shell very minute, conical, subperforated, rufous, not shining, 

 very thin and fragile, semi-transparent, with close white mem- 

 branaceous and oblique radiate plaits, directed slightly backwards; 

 about 15 per millm. on the last whorl. The interstices between 

 the plaits are minutely granulated, the granules sometimes grouped 

 in close spiral stripe on the last whorl. Spire acutely conical, apex 

 rather sharp, smooth. Whorls 5, the last occupying nearly one- 

 half of the height ; strongly convex. Suture deep. Aperture 

 diagonal, circular. Peristome simple, straight, the margins not 

 meeting, but united by a thin callus. In this species it can 

 hardly be spoken of a notch in the peristome at the point where 



