Endodonta.] GASTROPODA. 731 



Diameter Maj., 4 mm. ; niin., 3-4 mm. : height, 2 mm. 

 Animal unknown. 

 Type in my collection. 



Hob. North Island : Forty-mile Bush, rare, type (H. S.) ; Strat- 

 ford (R. Murdoch) ; Otaki Gorge (Preston). 



36. Endodonta subantialba, -Suter, 1890. ^ Plate 9, figs. 2!, u, b. 



Diplomphalus subantialba, Sut., T.N.Z.I., xxii, 1889 (1890), 226, pi. 15, 

 f. 10, a, b. Patula subantialba, Sut., T.N.Z.I., xxiv, 273. P. (Charopa) 

 subantialba, Sut. : Pilsbry, Man. Conch. (2), viii, 104, pi. 19, f. 40-42. 

 Charopa subantialba, Sut. : Hedley and Suter, P.L.S. N.S.W. (2), vii, 658. 

 Endodonta (Charopa) subantialba, Sut., J. de Conch, xli, 269. 



Shell minute, discoidal with infundibular spire, umbilicated, light- 

 horny, closely radially rib-striate. thin and fragile, semitransparent. 

 Sculpture of the post-nuclear whorls consisting of very fine, close, 

 subequidistant protractive riblets, about 30 per millimetre, arcuate 

 toward the periphery, thence straight down to the umbilicus ; inter- 

 stices with a few growth-lines, no spirals. Colour light-horny to almost 

 white. Spire infundibular, deeply sunk. Protoconch of 1J whorls, 

 convex and smooth, nucleus rather large. Whorls 5, convex, the first 

 three narrow and low, the fourth much raised, but the last not much 

 higher, though becoming very broad, occupying about two-thirds of 

 the shell's diameter ; all whorls are ascending rapidly from the suture, 

 angled above ; periphery and base rounded. Suture canaliculate. 

 Aperture lunate, narrow. Peristome acute, simple, upper margin 

 narrowly convex. Columella short, arcuate. Inner lip sharp, not 

 reflexed ; parietal wall with a thin white glaze. Umbilicus wide and 

 deep, perspective, very similar to the sunken spire. 



Diameter, 1-75 mm. ; height, 0-8 mm. 



Dentition. Suter, T.N.Z.I., xxiv, 295, pi. 22, f. 32, 33. 



Jaw strongly arcuate, membranous, ends rounded, distantly verti- 

 cally striated. 



Radula with the formula 100 x7 + 4+l + 4+7. Central tooth tri- 

 cuspid, with a short mesodont ; lateral teeth first similar to the central 

 tooth, but the outer ones with a shorter base and longer cutting-points ; 

 marginals tridentate, the mesodont longest. 



Type in my collection. 



Hob. North Island : Forty-mile Bush, type (H. S.). South Is- 

 land : Kenepuru (McMahon). 



Remark. This and the following species are allied to E. antialba, 

 Beddome, from Tasmania. 



*7. Endodonta vortex, Murdoch, 1897. Plate 29, figs. 3, a, b. 



Endodonta (Charopa) vortex, Murd., P. Mai. S., ii, 1897, 160, figs, in text. 



Shell minute, discoidal. infundibular above and below, whitish 

 with brown streaks, closely radially ribbed, somewhat shining, thin 



