Endodonta.] GASTROPODA. 681 



spiral lira; ; the protoconch smooth. Colour uniformly light fulvous, 

 the pullus whitish. Epidermis thin, not shining. Spire very little 

 raised, broadly convex. Protoconch of 1| lightly convex whorls, 

 flattish. Whorls 5|, regularly increasing, convex, periphery rounded ; 

 base flatly convex. Suture well impressed. Aperture oblique, hmate. 

 Peristome thin and sharp, the margins distant. Outer lip broadly con- 

 vex, the basal lip narrowly rounded. Columella very short, arcuate ; 

 the parietal wall convex, with a very low long and slender lamella on 

 its upper part, not much below the suture. Umbilicus rather wide, 

 deep, narrowly perspective, its diameter nearly one-third of the greatest 

 diameter of the shell. 



Diameter Maj., 2-6 mm. ; nun., 2-3 mm. : height, 14mm. 



Type in my collection. 



Hab. Bisbee Bay, Preservation Inlet. Collected by the scientific 

 party which visited the Sounds in December, 1908. 



4. Endodonta tau, Pfeiffer, 1862. Plate 27, fig. 2, a, b. 



Helix tau, Pfr., Mai. Bl., viii, 1862, 148 ; M.H. Viv., v, 159 ; Hector, Cat. 

 Land Moll. N.Z., 12. Patula (Charopa) tau, Pfr., Nomencl. Hel. Viv., 

 98 ; Hutton, M.N.Z.M., 8. Endodonta (Thaumatodon) tau, Pfr. : Mur- 

 doch, P. Mai. S., iii, 321. Patula Timandra, Hutton, N.Z.J.S., i, 1883, 

 475 ; T. N.Z.I., xvi, 175, 192. Endodonta Timandra, Hutt, : Suter, 

 T.N.Z.I., xxvi, 128, pi. 15, f. 13 ; P.L.S. N.S.W. (2), viii, 492. Patula 

 (Endodonta) Timandra, Hutt. : Pilsbry, Man. Conch. (2), viii, 84, pi. 24. 

 f. 21-23. Endodonta varicosa, Pfeiffer : Hedley and Suter, P.L.S. 

 N.S.W. (2), vii, 651 ; not of Pfeiffer. Endodonta (Thaumatodon} 

 Timandra, Hutt. : Suter, J. de Conch., xli. 258. Thaumatodon mini, 

 Webster, T. N.Z.I., xl, 257, pi. 21, f. 23. 



Shell small, discoidal, umbilicated, distantly ribbed. Sculpt K 

 consisting of radial sharp riblets on the post-nuclear whorls, inequi- 

 distant, sinuated on the upper surface and near the periphery, straight 

 on the base, 3 to 4 per millimetre ; the interstices with minute and 

 numerous fine growth-lines, reticulated by very fine and dense micro- 

 scopic spiral strise, visible also on the protoconch. Colour brown,, 

 tessellated with whitish. Spire flat, usually depressed at the centre 

 and the penultimate whorl raised, especially above the last whorl. 

 Protoconch small, of 1^ convex turns. Whorls 5, rather convex, 

 slowly increasing, periphery and base convex. Suture impressed. 

 Aperture small, slightly oblique, rotundly lunar, within with 3 lamellae 

 -1 at the middle of the parietal wall, 1 opposite on the outer wall, 

 the two sometimes closely approaching, and 1 at the base of the 

 inner lip ; they are thin and high, rather long, and broadly arched. 

 Peristome simple, straight, margins converging. Columella very short, 

 arcuate. Lip not reflexed. Umbilicus very broad, perspective, gra- 

 dated, about one-third of the greatest diameter. 



Diameter Maj., 3mm.; min., 2-75 mm. : height, 1mm. (type). 

 Diameter Maj., 4-1 mm. ; min., 3-6 mm. : height, 2-1 mm. (very 

 large specimen). 



