644 GASTROPODA. [Pulmonatu. 



reflection ; laterals also tricuspid ; marginals trident-ate, the outer 

 ones bidentate. 



Type in the Canterbury Museum, Christchurch. 



Hob. North Island : Near Auckland (T. F. Cheeseman) ; Thames 

 (Adams) ; Tuakau (S. Bull) ; Dannevirke (Brooks) ; Forty-mile Bush 

 (H. S.) ; Waimarama (A. Hamilton) ; Otaki Gorge and Mangahoe (H. B. 

 Preston) ; Mount Pirongia (T. Urquhart) ; Shannon, Manawatu 

 (R. Murdoch) ; Waitakerei Range (H. S.) ; Kaihu. Holdanga (Strick- 

 land). South Island : Kenepuru (McMahon) ; Greymouth (R. Helms) ; 

 Oapleston (Cavell) ; St. Helens, Amuri (F. Suter) ; Springburn (Pro- 

 fessor Dendy) ; Otarama (Alf. Suter) ; Fortrose (Miss Rich). Auck- 

 land Islands (Professor Benham). 



10. Allodiscus rusticus, Suter, 1894. Plate 9, fig. 4, a. l>. 



Allodiscus rusticus, Sut., T.N.Z.I., xxvi, 1893 (1894), 135, pi. 20, f. 37, a, b. 

 Flammulina (Allodiscus) rustica, Sut., J. de Conch., xli, 253 ; Man. 

 Conch. (2), ix, 338. 



Shell small, subdiscoidal, perforated, not shining, costate. thin, 

 semitransparent. Sculpture : Protoconch very faintly microscopically 

 spirally striated ; the following whorls with subequidistant sharp re- 

 tractive radiate riblets, about 8 per millimetre ; interstices with fine 

 growth-lines and indistinct microscopic spiral striae. Colour uniformly 

 pale-horny. Epidermis thin, corneous. Spire almost flat, about one- 

 fourth the height of the aperture. Protoconch of 1| lightly convex 

 whorls, flat. Whorls 5, slowly and regularly increasing, flatly rounded, 

 periphery regularly convex ; base roundish, impressed around the 

 umbilicus. Suture impressed. Aperture oblique, lunar. Peristoinc 

 simple^ acute. Columella very short. Inner Up obliquely descending, 

 slightly callous, not reflexed. Umbilicus very narrow, open, about 

 one-tenth of the greatest diameter. 



Diameter Maj., 5 mm. ; min., 4-5 mm. : height, 2-5 mm. 



Animal unknown. 



Type in my collection. 



Safe. Thames (T. F. Cheeseman). 



Remarks. -This species is nearly allied to A. Godeti, which, how- 

 ever, has much flatter whorls, less-impressed suture, the riblets slightly 

 closer and almost straight, not retractive, &c. 



11. Allodiscus Smithi, Suter, 1894. Plate <, fig. 5, a, b. 



Allodiscus Smithi, Sut., T.N.Z.I., xxvi, 1893 (1894), 134, pi. 20, f. 36, a, b. 

 Flammulina (Allodiscus) Smithi, Sut., J. de Conch., xli, 253 ; Man. 

 Conch. (2), ix, 338. 



Shell minute, discoidal, perforated, silky, thin, diaphanous, finely 

 costate. Sculpture : Protoconch distinctly microscopically spirally 



