Endodonta.} c. \STROPOD A. 



Type in my collection. 



Hob, White Horse Hill, Hooker Valley, type (H. S.) ; Nelson. 



2. Endodonta Chiltoni, Suter, 1909. Plate 27, fig. 5. 



Endodonta (Ptychodon) Chiltoni, Sut., P. Mai. S., viii, 1909. 200, pi. 11, 

 f. 21. 



Shell minute, subdiscoidal, umbilicated, very finely radially ribbed.. 

 thin and fragile, not shining. Sculpl'in- of the post -nuclear whorls 

 consisting of very fine, close, nearly straight radial riblets, about 25 

 per millimetre ; the interstices with minute growth-lines. Colour 

 yellowish-white, radially streaked with rufous. Spire very low, 

 broadly convex. Protoconch of If smooth and convex volutio-ns. 

 Whorls 5, very slowly increasing, flatly convex ; periphery and base 

 rounded. Suture deep. Aperture slightly oblique, rotundly lunar, 

 within with 11 slender elongated and low lamellae 1 on the parietal 

 wall above the middle, 1 on the colurnellar lip, and 9 on the outer 

 wall. Peristome thin, sharp, straight, regularly arched. Columella 

 very short, arcuate. Umbilicus wide, deep, perspective, about one- 

 third of the greatest diameter. 



Diameter Maj., 1-6 mm. ; min., 14 mm. : height, 0-9 mm. 



Animal unknown. 



Type in my collection. 



Hob. Kowai Bush, Canterbury, type (Professor Chilton). 



3. Endodonta Hectori, Suter, 1890. Plate 27, fig. 6, n c. 



Helix Hectori, Sut., T.N.Z.I., xxii, 222, pi. 14, f. 3, a-c. Patula (Maoriana) 

 Hectori, Sut. : Pilsbry, Man. Conch. (2), viii, 89, pi. 24, f. 44-47. Endo- 

 donta (Ptychodon) Hectori, Sut. : Hedley and Suter, P.L.S. N.S.W. (2), 

 vii, 652 ; Suter, J. de Conch., xli, 260. Ptychodon Hagdalence, Ancey, 

 " British Naturalist," April, 1891, 65. 



Shell minute, discoidal, umbilicated, radially ribbed, thin and 

 fragile, semitransparent, not shining. Sculpture consisting of close 

 and fine nearly straight radial riblets, about 15 per millimetre ; proto- 

 conch finer and closer radially striate ; interstices with minute growth- 

 lines ; a powerful lens shows traces of fine spiral striation. Colour 

 light horny - brown with large close darker - brown streaks. Spire 

 nearly flat. Protoconch of 1J convex whorls. Whorls 5. slowly and 

 regularly increasing, convex ; periphery and base rounded. Suture 

 impressed. Aperture slightly oblique, rotundly lunar, with 14 laminae 

 within 5 laminae on the parietal wall, a stout emarginate lamella at 

 the middle, and four slender and low lamellae below it, close together ; 

 2 on the columellar lip which are well developed, the upper lamella 

 has two or three sharp points, the lower is narrower, elevated, and 

 sharply pointed ; 7 laminae on the outer wall are rather stout, elevated, 

 not very long, and equidistant. Peristome acute, straight, margins 

 convergent. Columella very short and oblique. Umbilicus wide, deep, 

 perspective, nearly one-third of the greatest diameter. 



