608 GASTROPODA. [Pulmonata. 



Diameter, 6-75 mm. ; height, 10-25 mm. : aperture, 4-25 mm. by 

 7 mm. (type). 



Dentition (Hutton, T.N.Z.I., xvii, 55, pi. 12, f. 8). Formula of 

 radula 28 + 1 + 28, with about 9 laterals. Central tooth narrow, 

 with a small cutting-point ; laterals tricuspidate : marginals multi- 

 cuspidate. 



Tt/pe in the Canterbury Museum. Christchurch. 



Hab. Lake at Arthur's Pass, type (D. Brown) ; swamp at Bird- 

 ling's Flat ; Kowai Bush ; Ashburton ; near Christchurch ; Petone ; 

 Waipoua River. Masterton ; Wanganui ; Toko, near Stratford ; 

 Western Springs, Auckland ; pond. Mount St. John ; pond near 

 St. Jones's Lake. 



Var. globosa, Suter, 1891. 



Amphipeplea ampulla globosa, Suter, T.N.Z.I., xxiii, 1890 (1891), 93, pi. 18, 

 f. 12, a-c. Amphipeplea ampulla, var. globosa, Hedley and Suter, P.L.S. 

 N.S.W. (2), vii, 626 ; Suter, J. de Conch., xli, 1893 (1894), 231. 



Shell ovate, inflated, very thin and fragile, transparent, faintly 

 shining. Sculpture consisting of plait - like close and well - marked 

 growth-lines. Colour pale-horny. Spire short, acute, apex sometimes 

 eroded. Whorls 4, the last large and inflated. Suture impressed. 

 Aperture large, ovate, occupying about three-fourths of the height 

 of the shell. Outer lip thin and sharp, not reflected. Columella 

 arcuate, with a light spiral fold. Inner lip very broadly reflected 

 over the body, and covering the umbilical area. 



Diameter, 9 mm. ; height, 13 mm. : aperture, 6 mm. by 10 mm. 

 (type). 



.lii> ma! and dentition the same as in the species. 



Type in my collection. 



Hab. Lagoon at Birch Hill Station. Tasman Valley, type (H. S.) ; 

 near Wanganui (R. Murdoch). 



Remarks. This variety differs from the species in the more globose 

 form, larger size, lighter colour, and the greater fragility and trans- 

 parency. The spire is, as a rule, somewhat shorter, and the reflexed 

 portion of the inner lip broader. It is very closely allied to the Tas- 

 manian A. launcestonensis. T. -Woods. 



2. Amphipeplea arguta, Hutton, 1885. Plate 24. fig. 15. 



Limncea (Amphipeplea) arguta, Hutt., T.N.Z.I., xvii, 1884 (1885), 54, pi. 12, 

 f. 1. Amphipeplea arguta, Hedlev and Suter, P.L.S. N.S.W. (2), vii, 

 626; Suter, J. de Conch., xli, 1893 (1894), 231 ; T.N.Z.I., xxxvii, 250, 



Shell small, globosely ovate, glossy, thin and fragile, semitrans- 

 parent. Sculpture consisting of fine growth-stripe only. Colour dark 

 olive-green when alive, horny-brown when dry. Epidermis thin, 

 transparent, shining. Spire very short, slightly acute, about one- 

 fourth the height of the aperture. Protoconch small, rounded, usually 

 eroded. Whorls 3 to 3-J-, the last inflated and occupying the greater 



