662 GASTROPODA. 



Jaw slightly arcuate, membranous, the ends bent slightly up- 

 wards. It is composed of numerous narrow nearly vertical plaits, 

 partly overlying each other, broadly indenting the upper margin. 



Radula tongue-shaped, the straight transverse rows consisting of 

 34+ 1 + 34 teeth, of which 14 are laterals. Central tooth quadrangular, 

 somewhat longer than broad, with a triangular reflection, bearing 1 

 short median cutting-point, which does not extend to the posterior 

 end of the base. Laterals slightly broader, bicuspid, the inner cusp 

 much broader and longer than the anterior one, each of them being 

 provided with a cutting-point, which shows a development corre- 

 sponding to the reflection, but neither of them reaches to the posterior 

 end of the base. A number of intermediate teeth are following, in 

 which the base is getting shorter, the 2 cutting-points stouter and 

 longer, extending beyond the base. Marginals short and broad, pro- 

 vided with 2 well-developed inner cutting-points, the outer posterior 

 margin of the base bearing 3 to 4 small teeth or being simply indented. 

 Last marginals rudimentary, quadrate, minute. 



Type in the British Museum. 



Hob. North Island : Wairarapa, type (W. T. L. Travers) ; Ra- 

 wene, Hokianga (R. Murdoch) ; Auckland (H. S.) ; Ohaupo ; Wai- 

 kato (W. W. Smith) ; Mount Pirongia (T. Urquhart) ; Toko, near 

 Stratford (R. Murdoch) ; Ngaputahi, Tuhoe-land (A. Hamilton) ; 

 Forty-mile Bush (H. S.) ; Kaitaia (R. H. Matthews). South Island : 

 Kenepuru (McMahon) ; Collingwood ; Saddle Hill, Taieri (E. Suter). 



Var. pallidula, Suter, 1892. 



Thalassia neozdamca, forma pallidula, Sut., T.N.Z.I., xxiv, 1891 (1892), 212. 



Shell very light corneous, without any colour-markings. 

 Type in my collection. 

 Hob. Forty-mile Bush (H. S.). 



8. Therasia Valeria, Hutton, 1883. Plate S), Kg. 8. a, l>. 



Therasia Valeria, Hutt., N.Z.J.S., i. 1883, 477; T.N.Z.I., xvi, 1883 (1884), 

 183, 202. Gerontia (Therasia) Valeria, Hutt. : Pilsbry, Man. Conch. (2). 

 viii, 69, pi. 22, f. 46-48. Therasia Valiera, Hutt. : Hedley and Suter, 

 P.L.S. N.S.W. (2), vii, 640. Flammulina (Therasia) Valeria, Hutt. : 

 PUsbry, Man. Conch. (2), ix, 16 ; Sut.-r. .f. de Conch., xli, 246. 



Shell globose-conoidal, depressed, finely ribbed, subperforate, thin 

 and fragile. Sculpture : Protoconch microscopically very finely and 

 closely spirally striate, the succeeding whorls radially finely ribbed, 

 the riblets inequidistant and of somewhat unequal strength, oblique, 

 retractive, sinuous over the periphery and extending to the perfora- 

 tion, about 15 per millimetre, the interstices with fine growth-lines 

 and microscopic crowded spiral lines. Colour pale-horny, with IIUMH'- 

 rous radial oblique zigzag bands of rufous, extending over the base. 



