738 GASTROPODA. \_Pulntonata. 



Jaw arched, not tapering, of 21 imbricating plates, covered thickly 

 with papilke. 



Radula with the formula 23 + 1 + 23. Central tooth unicuspid ; 

 laterals and marginals rather oblique, bicuspid, with small points. 



Type in the British Museum. 



Hob. North Island : Whangarei (Musson) ; Little Barrier Island 

 (Adams) ; near Auckland ; Waitakerei Range (H. S.) ; Thames 

 (Adams) ; Hunua Range (Major Broun) ; Mounts Taupiri and Pi- 

 rongia (Urquhart) ; Napier ; Wellington. 



Forma albina. 



Perfectly white specimens are not rare. 



Subsp. conicula, Suter, 1907. Plate 11, fig. 1. 



Laoma p&cilosticta conicula, Suter, P. Mai. S., vii, 1907, 236, pi. 22, f. 1. 



Shell small, dome-shaped, irnperforate, radially finely costate, 

 suture margined, last whorl keeled, with a columellar plait. Sculpture 

 consisting of close rounded flexuous radiate plications, extending 

 over the base ; the protoconch and the base are microscopically spirally 

 striate, but the strise are much more distinct on the latter. Colour 

 fulvous, with rather faint longitudinal zigzag bands of rufous ; margins 

 of suture and keel on the last whorl with whitish dots. Epidermis 

 thin, shining. Spire dome-shaped, with a blunt rounded apex. Proto- 

 conch of 1J flatly convex volutions. Whorls 6, slowly increasing, flatly 

 convex, as is also the base. Suture impressed, margined above on the 

 last four whorls with a distinct thread. Aperture a little oblique, 

 angularly lunate, breadth about twice the height. Peristome simple, 

 straight. Outer lip but little convex, forming a distinct angle with 

 the slightly rounded basal lip. Columella callous, oblique, with a not 

 much pronounced plait. Umbilical region showing but a faint im- 

 pression. No perforation, not even in young examples. 



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



Animal unknown. 



Type in my collection. 



Hob. North Island : Kaihu, Hokianga, type (Strickland) ; Wai- 

 wera (H. S.). 



Subgen. 2. PHRIXGNATHUS, Hutton, 1883. 



Phrixtjnathus, Hutton, T.N.Z.I., xv, 1882 (1883), 136. Type: Helix fatua, 

 Hutt., 1882 ; not of Pfeiffer = Phrixgnathns Celia, Hutt., 1883. Pilsbry. 

 Man. Conch. (2), ix, 9. 



Animal and shell the same as in Laoma, s. str., except that the 

 aperture has no teeth or folds within. 



Distribution. New Zealand and its subantarctic islands, Tasmania, 

 southern and eastern parts of Australia, and British Now Guinea. 



