614 GASTROPODA. \Pulmonata. 



last large, ventricose, inversely conical, its periphery flat or convex ; 

 base rounded. Suture not much impressed. Aperture subvertical, 

 oval, angled above. Outer lip straight or convex, thin and sharp. 

 Basal Up narrowly arched and a little produced. Columella oblique, 

 a little arcuate, strongly twisted, and with a prominent fold above. 

 Inner lip narrow, somewhat reflexed over the pillar above, sealing up 

 the umbilicus or leaving a narrow chink, spreading over the flatfish 

 parietal wall. 



Diameter, 12 mm. ; height, 17 mm. : aperture, 6-5 mm. by 14mm. 

 Proportion of diameter to height, 1 : 1-5. Proportion of diameter to 

 height of aperture, 1 : 2-2. Proportion of height of aperture to height 

 of shell, 1:1-4. 



Animal unknown. 



Type in the British Museum. 



Hob. North Island : Kaipara (R. Buddie). 



5. Isidora tabulata, Gould, 1848. Plate 24, tig. 22. 



Physa tabulata, Gould, P. Bost. S.N.H., ii, 214; U.S. Expl. Exp., xii, lift' 

 f. 136 ; Hutton, M.N.Z.M., 30. Aplexa tabulata, Old. : Button, P.L.S' 

 N.S.W., vii, 67. Bulinus tabulatus, Old. : Hutton, T. N.Z.I., xvii, 57 ' 

 Hedley and Suter, P.L.S. N.S.W. (2), vii, 627 ; Suter, J. de Conch., xli' 

 233. Isidora tabulata, Old. : Suter, T. N.Z.I., xxxvii, 270, f. 1 (reversed) ; 

 xxxviii, pi. 19, f. 1. 



Shell inflated, solid, short, greenish-brown. Spire obtuse, rathei 

 short, whorls rather square, flattened near the suture ; last whorl 

 large, roundly angular. Aperture wide, pale within, slightly acumi- 

 nated. Inner lip strong, columellar fold thick, tortuous. 



Remarkable for the flatness of the whorls above the angle (Sowerby). 



Diameter, 16 mm. ; height, 22 mm. : aperture, 8 mm. by 12 mm. 

 Proportion of diameter to height, 1 : 1-4. Proportion of diameter to 

 height of aperture, 1 : 1-5. Proportion of height of aperture to height 

 of shell, 1 : 1-8. 



Dentition. A. H. Cooke, P.Z.S., 1889. 140, f. 4. 



Type in the U.S. Nat. Museum, Washington. 



Hob. A mountain-stream. Bay of Islands (Drayton). 



I have not seen this species. 



Subsp. moesta, H. Adams, 1861. Plate 24, fig. 23. 



Physa moesta, H. Ad., P.Z.S., 1861, 144 ; Hutton, M.N.Z.M., 31. Aplexa 

 mossta, Ad. : Hutton, P.L.S. N.S.W., vii, 67. Bulinus moesta, Ad. : 

 Hutton, T.N.Z.I., xvii, 57; Hedley and Suter, P.L.S. N.S.W. (2), 

 vii, 627 ; Suter, J. de Conch., xli, 233. Isidora tabulata moesta, Ad. : 

 Suter, T.N.Z.I., xxxvii, 270. Physa coromandelica, Dunker, Malak. 

 Blatter, 1862, 150. Bulinus coromandelicus, Dkr. : Hedley and Suter, 

 P.L.S. N.S.W. (2), vii, 628 ; Suter, J. de Conch., xli, 233. 



Shell ovate, thin and fragile, imperforate ; the whorls usually 

 shouldered, but sometimes convex. Sculpture consisting of very fine 

 growth-lines only. Colour olive-brown to chestnut. Epidermis thin, 



