606 GASTROPODA. [Pulmonala. 



Epidermis thin, somewhat shining. Spire slightly raised, conic, its 

 height a little less than that of the aperture. Protoconch small, 

 globular. Whorls 4. moderately convex, the last high ; base rounded. 

 Suture impressed. Aperture oval, rather narrow, angled above. Outer 

 lip lightly convex, thin and sharp. Basal Up very narrowly arched 

 and somewhat effuse. Columella vertical, straight, very little twisted. 

 Inner lip very thin, narrowly expanded over the umbilical tract, 

 broader upon the nearly straight parietal wall. 



Diameter, 2-5 mm. ; height, 4 mm. (type). 



Animal unknown. 



Type in the Canterbury Museum, Christchurch. 



Hab. Auckland. 



4. Lymnoea tenella, Button, 1885. Plate 24, fig. 13. 



Limncea tenella, Hutt,, T.N.Z.I., xvii, 1884 (1885), 55, pi. 12, f. 4; Hedley 

 and Suter, P.L.S. N.S.W. (2), vii, 625 ; Suter, J. de Conch., xli, 1893 

 (1894), 230. 



Shell very small, eloiigately oval, not glossy, dark-horny. Sculp- 

 ture consisting of fine growth-lines only. Colour olive-horny. Epi- 

 dermis thin, transparent. Spire moderately elevated, conical, of the 

 same height as the aperture. Protoconch small, broadly rounded. 

 Whorls 4, moderately convex, the last not ventricose ; base rounded. 

 Suture well impressed. Aperture subvertical, ovate, angled above. 

 Outer lip thin and sharp, convex. Basal lip broadly arched. Colu- 

 mella slightly oblique, with a slight median fold. Inner lip not pro- 

 duced beyond the pillar, leaving a narrow umbilical chink, extending 

 over the flattish parietal wall. 



Diameter, 1-75 mm. ; height, 4-5 mm. 



Animal yellowish-white, semitransparent. the head between the 

 eyes and the centre of the rostrum yellowish-brown. Foot emarginate 

 in front ; tentacles triangular, flattish, very short. Eyes triangular. 



Dentition (Hutton. I.e., 56, pi. 12, f. 11). Formula of radula 

 20+1 + 20, about 6 or 8 laterals. Central tooth long and narrow, 

 laterals bicuspid, marginals tricuspid. 



Type in the Canterbury Museum, Christchurch. 



Hab. River Heathcote, Christchurch. 



5. Lymnoea tomentosa, Pfeiffer, 1855. 



Succinea tomentosa, Pfr., P.Z.S., 1854 (1855), 297; M.H. Viv., iv, 814; 

 Reeve, Conch. Icon., xviii, Succinea, f. 81 ; Hector, Cat. Land Moll. N.Z., 

 1873, 3 ; Hutton, M.N.Z.M., 13 ; Clessin, Nomenclator Hel. Viv., 414. 

 Limncea tomentosa, Pfr. : Hedley and Suter, P.L.S. N.S.W. (2), vii, 625 ; 

 Suter, J. de Conch., xli, 229. 



Shell small, oblong, conical, thin, pellucid, not shining, covered 

 with downy hairs. Colour pale-horny. Spire conical, acute, half the 

 height of the aperture. Whorls 3. the second convex, the last large, 

 attenuated at the base. Aperture oblique, anteriorly produced. Outer 



