760 GASTROPODA. [Pulmonata. 



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



Dentition. Suter, T.N.Z.I.. xxvi, 130. pi. 18, f. 24. 25. 



Jaw and radula normal, the latter having the formula 14+ 1 + 14. 



Type in my collection. 



Hah. North Island : Camel Bay ; Chicken Island (C. Cooper) ; 

 Little Barrier Island (Adams) ; Wade ; Mount Wellington lava- 

 fields (H. S.) ; Ohaupo (Musson) ; Tarukenga (Major Broun) ; Wai- 

 marama (A. Hamilton) ; Wanganui ; Toko, near Stratford (R. Mur- 

 doch) ; Forty-mile Bush, type (H. S.). 



35. Laoma Murdoch!, Suter, 1894. Plate 10, figs. 3. 3rr, 3b. 



Phrixgnathus Murdoclil, Suter, T.N.Z.I., xxvi, 1893 (1894), 136, pi. 21. 

 f. 39. a, b. Laoma, (Phrixgnathus) M m-ilnrli. Suter, J. cle Conch., xli, 282. 



Shell small, depressed conoidal, broadly umbilicated, carinated, 

 with a projecting cord above the suture, very thin and diaphanous, 

 waxen. Sculpture : The post-embryonic whorls all keeled, the keel 

 forming a free cord above the suture, and continued on the periphery 

 of the body-whorl ; there is also a carina margining the umbilicus : 

 surface with fine and close oblique radiate striae, crossed by micro- 

 scopic indistinct spiral lines. Colour pale-horny, the carina of the 

 whorls with equidistant brown spots. Spire somewhat dome-shaped, 

 its height equal to that of the aperture. Protoconch of If smooth 

 whorls, broadly convex. Whorls 6, slowly and regularly increasing, 

 flatly concave ; periphery keeled, base flattish. Suture superficial, 

 hidden on the lower whorl by the projecting carina. Aperture squarish, 

 diagonal. Peristome very thin and sharp. Outer lip sinuated, sharply 

 angled on meeting the basal lip. Columella oblique, almost straight. 

 Inner lip thin, slightly expanded above. Umbilicus broad and deep, 

 perspective, 45 per cent, of the greatest diameter. 



Diameter Maj., 5-5 mm. ; min., 5-25 mm. : height, 2-5 mm. 



Animal unknown. 



Type in my collection. 



Hob. North Island : Rawene, Hokianga (R. Murdoch). One 

 specimen only was found. 



36. Laoma pumila, Button, 1883. Plate 9, figs. 24, a, b. 



Microphysa (?) pumila, Hutt., T. N.Z.I., xv, 1882 (1883), 134. Microphysa 

 pumila, Hutt., T.N.Z.I., xvi, 19f>. Laomu /unnila, Hutt., Man. Conch. 

 (2), viii, 63, pi. 23, f. 97-99. L. (Plirij-./tnithus) pumila, Hutt. : Hedley 

 and Suter, P.L.S. N.S.W. (2), vii, 64S ; Suter, J. de Conch., xli, 279. 



Shell minute, subdiscoidal, umbilicated, thin, translucent, scarcely 

 shining, corneous, radially finely ribbed. Sculpture : The nucleus of 

 the protoconch is smooth, but the following half-whorl is micro- 

 scopically spirally lirate ; succeeding whorls with regular oblique 

 retractive membranous riblets, 8 to 10 per millimetre, the interstices 

 finely reticulated. Colour horny-brown. Spire slightly convex, low. 

 Protoconch of 1 \ turns, lightly convex. Whorls 4. the last two rather 



