086 GASTROPODA. [Pulmonata. 



distance from the margin. Columella short, arcuate. Inner lip 

 slightly reflected. Umbilicus broad, perspective, showing all the 

 whorls, about one-third of the greatest diameter. 



Diameter, 1-75 mm. ; height, 0-75 mm. 



Jaw wide and low, tapering at both ends, cutting-edge lightly 

 concave in the middle, distinctly vertically striate at the centre. 



Radula with the central and lateral teeth tricuspid ; inner marginals 

 with 3, outer with 2 cutting-points. 



Type in my collection. 



Hob. White Horse Hill, Hooker Valley, amongst mould in the 

 subalpine bush (H. S.). Very rare. 



2. Endodonta Jessica, Hutton, 1883. Plate 9, fig. 15, a-c. 



Patula Jessica, Hutt., N.Z.J.S., i, 1883, 475; T.N.Z.I., xvi, 174, 192. 

 P. (Endodonta) Jessica, Hutt. : Pilsbry, Man. Conch. (2), viii, 85, pi. 24, 

 f. 24-27. Endodonta Jessica, Hutt. : Hedley and Suter, P.L.S. N.S.W. 

 (2), vii, 651 ; Suter, T.N.Z.I., xxvi, 128, pi. 15, f. 14. E. (Thaumatodon) 

 Jessica, Hutt. : Suter, J. de Conch., xli, 258. 



Shell small, umbilicated, discoidal, ribbed, aperture with 6 lamellae. 

 Sculpture consisting of numerous rather close radial riblets, 12 to 

 15 per millimetre; they are inequidistant, sinuated on the upper 

 surface, but straight and feebler below ; interspaces strongly striated 

 with growth-lines, and microscopically finely, sometimes very indis- 

 tinctly, reticulated with spirals ; protoconch smooth. Colour horny, 

 largely radiately . streaked and clouded with reddish-brown, giving a 

 general dark colour to the shell. Spire flat, the centre usually sunken, 

 the penultimate whorl mostly raised above the other whorls. Proto- 

 conch of 1| convex volutions. Whorls 4| to 5|, very slowly increasing, 

 rounded, periphery and base convex. Suture impressed. Aperture 

 subvertical, rotundly lunar, within with 6 thin highly arched lamellae, 

 2 on the parietal wall, 4 on the outer wall, the lowest close to the 

 columellar lip. Peristome thin, flatly angled above, then regularly 

 arched . Columella very short, arcuate, its lip not reflexed. Um- 

 hilicus, wide, perspective, showing all the whorls, nearly half of the 

 greatest diameter. 



Diameter Maj., 4-25 mm. ; min., 3-75 mm. : height, 2mm. 



Animal unknown. 



Type in the Canterbury Museum, Christchurch. 



Hob. South Island : Kenepuru (McMahon) ; Nelson : Bealey, type 

 ;Dr. Haast). 



3. Endodonta monoplax, n. sp. Plate 27, fig. 1, a, b. 



Shell minute, subdiscoidal, umbilicated, light fulvous, thin and 

 fragile, radially closely ribbed, with 1 slender lamella on the upper 

 part of the parietal wall. Sculpture consisting of close fine and sharp 

 equidistant flexuous radial riblets, about 12 per millimetre ; the 

 interstices with fine microscopic .growth-lines, reticulated by dense 



