.[llodisctis.] GASTROPODA. 641 



Diameter, 4-5 mm. ; height, 2-5 mm. 



Jaw slightly arcuate, not tapering, flatly plaited, the upper margin 

 indented. 



Radula having the formula 14+6+1 + 6+14. Central tooth 

 rectangular, not much longer than broad, reflexed portion tricuspid, 

 the mesocone extending to the posterior margin of the base. Laterals 

 a little broader than the central, bicuspid, the inner cutting-point long, 

 extending beyond the base. Marginals much broader than long, with 

 4 to 5 cutting-points. The larger cutting-points of the laterals and 

 marginals reach over the next row of teeth. 



Type in my collection. 



Hob. South Island : Foot of Sealy Range, Hooker Valley ; under 

 stones (H. S.). 



Remarks. This species is allied to A. Tullia, Hutt., but is easily 

 distinguished from it by the absence of colour-markings, the stronger 

 and more distant riblets, and the open perforation. This species is 

 sometimes infested by a Distoma (Suter. T.N.Z.I.. xxiii, 95, pi. 17, 

 f. 9). 



7. Allodiscus granum, Pfeiffer, 1857. Plate 9, fig. 3, a, b. 



Helix granum, Pfr., P.Z.S., 1857, 107 ; M.H. Viv., iv, 20. H. (Thalassia) 

 granum, Pfr. : Hector, Cat. Land Moll. N.Z., 5. Nanina (Thalassia) 

 granum, Pfr., Nomencl. Hel. Viv., 46. Charopa (Thalassia) iota granum, 

 Pfr., Man. Conch. (2), ii, 212. Helix granum, Pfr., M.N.Z.M., 20. Fruti- 

 cicola pilula granum, Pfr. : Button, T. N.Z.I., xvi, 194. Phenacohelix 

 granum, Pfr. : Hedley and Suter, P.L.S. N.S.W. (2), vii, 642. Flam- 

 mulina (Phenacohelix) granum, Pfr. : Suter, J. de Conch., xli, 249 ; 

 Man. Conch. (2), ix, 16. Charopa Miranda, Hutton,' N.Z.J.S., i, 1883, 

 476; T.N.Z.I., xvi, 1883 (1884), 180. Psyra Miranda, Hutt., i.e., 202. 

 Gerontia (Allodiscus) Miranda, Hutt. : Pilsbry, Man. Conch. (2), viii, 

 68, pi. 22, f. 40-42. Allodiscus Mirandus, Hutt. : Hedley and Suter. 

 P.L.S. N.S.W. (2), vii, 639. Flammulina (Allodiscus) Miranda, Hutt. : 

 Suter, J. de Conch., xli, 252 ; Mail. Conch. (2), ix, 15. 



Shell very small, turbinately globose, thin, very closely and finely 

 striately ribbed, subperf orated. Sculpture : The first two whorls suc- 

 ceeding the smooth protoconch are radially ribbed ; riblets about 

 20 per millimetre ; they are gradually becoming closer and finer, 

 numbering about 40 per millimetre on the penultimate and about 

 50 on the last whorl ; the interstices with few fine growth-lines, 

 crossed by microscopic dense spiral lirse. Colour pale corneous, with 

 broad rufous radial bands on the spire-whorls, minutely tessellated at 

 the periphery and base. Epidermis thin, not shining. Spire conoidal, 

 slightly acute, about one-third the height of the aperture. Proto- 

 conch slightly raised, of 1^ convex whorls, microscopically pitted. 

 Whorls 5^, convex, the last not descending, rather swollen near the 

 aperture ; base convex. Suture impressed. Aperture sub vertical, 

 broadly lunar. Peristome simple, straight, margins subcon verging. 

 Columella short, oblique, arcuate. Inner lip slightly callous and re- 

 flected, partly covering the very narrow perforation. 



21 Moll. N.Z. 



