638 GASTROPODA. [Pulmonata. 



Spire conoidal, depressed, obtuse, about one-third the height of the 

 aperture. Protoconch of 1^ flattish whorls. Whorls 5|, first slowly 

 then more rapidly increasing, convex, periphery rounded ; base flatly 

 convex, slightly depressed at the middle. Suture impressed. Aper- 

 ture oblique, rotundly lunate. Peristome acute, straight. Outer Up 

 regularly arched. Basal lip straightened. Columella oblique, slightly 

 excavated. Inner Up callous, broadly reflexed over and completely 

 sealing up the umbilicus, spreading as a thin white glaze over the 

 convex parietal wall. 



Diameter Maj., 14-5 mm. ; min.. 12-5 mm. : height. 10mm. 



Animal unknown. 



Type in the Canterbury Museum, Christchurch. 



Hob. Big King, Three Kings Islands (T. F. Cheeseman, Captain 

 Bollons). 



Remark. The locality Napier, as stated by Hutton, is wrong. 



3. Allodiscus chion, Sykes, 1896. Plate 25, figs. 11. lla, 11&. 



Flammulina (Allodiscus) chion, Sykes, P. Mai. S., ii, 1896, 107, figs, in text. 



Shell small, depressed conical, imperforate, thin, translucent, white. 

 Sculpture : Protoconch microscopically distinctly spirally striate, the 

 succeeding whorls with fine, subequidistant, sharp, obliquely pro- 

 tractive riblets, about 8 per millemetre, the interstices with fine growth- 

 lines reticulated by microscopic spiral lirse. Colour uniformly white. 

 Epidermis transparent, but very little shining. Spire conoidal, convex, 

 about half the height of the aperture. Protoconch of 2 convex whorls. 

 Whorls 5 to 5|, convex, regularly increasing, the last not descending ; 

 base convex, impressed at the middle. Suture rather deep. Aperture 

 oblique, rotundly lunate. Peristome simple, thin and sharp, broadly 

 arched. Columella short, oblique, arcuate. Inner lip lightly callous, 

 reflexed. spreading broadly as a very thin smooth callosity over the 

 convex parietal wall. There is no trace of an uniliilical perforating. 



Diameter Maj.. 5 mm. : height, 3 mm. 



Animal unknown. 



Type in Mr. E. R. Sykes's collection ; co-type in my collection. 



Hab. Near Inglewood, Taranaki (H. B. Preston). 



Remarks. The nearest species appears to be A. venulatus, Pfr.. 

 from the South Island ; from this, however. A. chion may be separated 

 by the difference in the relative proportions of breadth and height, 

 as also by the more distant and more elevated riblets. The entire 

 absence of colour is also a remarkable feature. 



4. Allodiscus Cooperi, Suter, 1907. Plate 11, fig. 5. 6, 7. 



AY'/ in in nl iiiu (Allodiscus) Cooperi, Sut., P. Mai. S., vii, March, 1907, 237,- 

 p). 22, f. 5-7. 



Shell small, orbicular, costate, imperforate, and with broad zigzag 

 streaks. Soil pi are consisting of close and sharp radial cost*, very 



