592 GASTROPODA. [Pulmonata.- 



linear, somewhat uneven. Aperture pyriform, channelled above, 

 rounded below. Outer lip very slightly sinuate above, sharp, but 

 rather solid, lightly convex, smooth inside. Columetta vertical, with 

 a lower small and an upper larger plait, both of which are nearly 

 transverse ; a third plait, very large and obliquely descending, is 

 situated at the middle of the parietal wall. Inner lip extending as 

 a thin glaze beyond the columella on the body. 



Diameter, 5 mm. ; height, 9 mm. (type). 



Animal unknown. 



Type in the Otago University Museum, Dunedin. 



Hab. Massacre Bay, type (Filhol) ; Auckland (Cheeseman) ; Bay 

 of Islands ; Chicken Islands ; Mokohinau Islands ; Foxton ; Chatham 

 Islands ; Banks Peninsula (Iredale). 



Genus 3. LEUCONIA, Gray, 1840. 



Leuconia, Gray, " Turton's Manual,'' ed. 2, 227. Type : Valuta bidentata, 

 Montfort. 



Animal having short and compressed tentacles, with the eyes at 

 their bases. Foot truncated in front, with a transverse anterior 

 groove. 



Shell ovate, oblong, imperforate, smooth ; spire conical ; aperture 

 elongate, ovate ; inner lip with 2 plaits anteriorly ; outer lip smooth 

 inside, simple, acute. 



Distribution. Seas of Europe, Antilles. 



Leuconopsis, Hutt., T. N.Z.I., xvi, 1883 (1884), 213. Type : L. obsoleta, 

 Hutt. 



Sect. 1. LEUCONOPSIS, Hutton, 1884. 

 Hutt., T.N.Z.I., xvi, 1883 (1884), 213. '. 



Distinguished from the genus by having only 1 plait on the inner 

 lip. 



Distribution. Australasia. 



KEY TO SPECIES. 



A. Shell with 6 whorls when adult, with a very feeble columellar plait ; 



spiral striae distant . . . . . . . . . . inermis. 



B. Shell with 4 whorls when adult, the coluinellar fold well pronounced ; 



spiral striae close . . . . . . . . . . obsoleta. 



1. Leuconia inermis, Hedley, 1901. Plate 21, fig. 3. 



Leuconopsis inermis, Hedley, P.L.S. N.S.W., xxv, 722, pi. 48, f. 15 ; Ire- 

 dale, T.N.Z.I., xl, 386. 



Shell ovate, solid, imperforate. Sculpture : The surface is usually 

 much abraded ; where it is intact fine raised hair-lines twice or thrice 

 their own diameter apart cross the shell obliquely ; a few faint and 

 distant spiral grooves are perceptible. Colour dull white. Traces 

 are present of a thin membranous yellow epidermis. Spire conical 



