Endodonta.] GASTROPODA. 70') 



8. Endodonta titirangiensis, Suter, 1896. Plate 10, figs. 6, a, b. 



Endodonta (Charopa) titirangiensis, Suter, P. Mai. S., ii, 1896, 35, pi. 4, 

 f. 8-10. 



Shell small, discoidal, umbilicated, thin, horn-colour, semitrans- 

 parent, radially costate, dull. Sculpture of the post-nuclear whorls 

 consisting of fine, not much raised, subequidistant and retractive 

 riblets, 9 to 10 per millimetre, slightly arcuate on the periphery, 

 straight on the base ; interstices with fine growth-lines and traces 

 of microscopic spiral striae. Colour horny, without colour-markings ; 

 protoconch white. Spire very little raised, flat. Protoconch of 1^ 

 smooth convex volutions. Whorls <i, convex, the first three gradually 

 increasing, the last attaining a relatively considerable development, 

 taking up about one-third of the maximum diameter ; periphery and 

 base rounded. Suture well impressed. Aperture rotundly lunate, 

 oblique. Peristome simple, sharp, slightly sinuate at the periphery. 

 Columella short, arcuate. Inner lip not thickened, a little expanded ; 

 parietal wall with a broad white and thin callosity. Umbilicus mode- 

 rately wide, gradate, about one-third of the greatest diameter. 



Diameter Maj., 3-75 mm. ; min.. 3-25 mm. : height, 1-75 mm. 



Animal unknown. 



Type in my collection. 



Hub. North Island : Titirangi, in Nikau Bush (type) ; Wai-. 

 takerei Range, near Henderson (H. S.). 



2. Group of Endodonta egesta. 



Shell with radial riblets and very distinct spiral liree. Protoconch 

 smooth or spirally lirate. 



KEY TO SPECIES. 



a. Radial riblets distant, 3 per 2 millimetres, membranous, with 



triangular lamellae when fresh ; spirals very distinct . . egesta. 



b. Radial riblets 8-9 per millimetre ; spirals very distinct . . . . gaza. 



c. Radial riblets 18 per millimetre ; fine spiral threads on the base . . transenna. 



i 



9. Endodonta egesta, Gray, 1850. Plate 28, fig. 1. 



Helix egesta, Gray, P.Z.S., 1849 (1850), 166 ; M.H. Viv., iii, 102 ; Reeve, 

 . Conch. Icon., vii, pi. 131, f. 798 ; Conch. Cab. (2), i, 458, pi. 155, f. 18-20 ; 



Gray, A.M.N.H. (2), vii, 66. H. (Charopa) egesta, Gray : Hector, Cat. 

 Land Moll. N.Z., 12. H. (Patula) egesta, Gray : Tryon, Man. Conch. (2), 

 iii, 23, pi. 3, i'. 15. Patula egesta, Gray :' Button, M.N.Z.M., 8 ; T.N.Z.L, 

 xvi, 193. P. (Charopa) egesta, Gray : Nornencl. Hel. Viv., 98. Charopa 

 egesta, Gray : Hedley and Suter, P.L.S. N.S.VV. (2), vii, 659. Endodonta 

 (Charopa) egesta, Gray : Suter, J. de Conch., 262. 



Shell small, depressedly seniiglobose, umbilicated, with distant 

 radial plaits, produced into membranous lamellae, spirally distinctly 

 lirate, blackish, rather solid. Sculpture consisting of equidistant 

 oblique and retractive plaits, with a membranaceous subtriangular 

 deciduous lamella on the spire-whorls, 2 on the body-whorl, one above 



