674 (GASTROPODA . [Pttlmoifata. 



separated from the last whorl by a slight incision. Colwnclla vertical, 

 arcuate. Inner Up very little thickened, widely opened out or reflexed 

 above. Umbilicus moderate, pervious, showing all the whorls, about 

 one-fifth of the greatest diameter. 



Diameter Maj., 6 mm. ; min., 5 mm. : height, 3 mm. (type). 



Dentition. Hutton, T.N.Z.I., xvi. 171, pi. x, f. B (Paryphanta 

 Chiron}- Suter, T.N.Z.I., xxiv, 289, pi. 20, f. 11. 12 (Amphidoxa 

 Chiron) ; Man. Conch. (2), ix, pi. 2, f. 17, 18. 



Jaw arcuate, membranous, with about 15 vertical plaits, separated 

 from one another. 



Radula (Plate 1, fig. 16) having the formula 110 x 12+5+ 1 + 5+ 12. 

 Central tooth rectangular, tricuspid, the middle cusp long. Laterals 

 somewhat larger, tricuspid, the mesocone long, the entocone larger than 

 the ectocone. Marginals tridentate, the middle tooth broad, short, the 

 inner one longer and narrower, the outer one short. Towards the 

 margin the denticles coalesce by degrees into one mass, the last 

 rudimentary. 



Type in the British Museum. 



Hob. Auckland, type (Greenwood) ; Whangaroa (C. Cooper) ; 

 Hillyer's Creek ; Mount Wellington : Ohaupo (Musson) ; Thames 

 (Adams) ; Waitakerei Range (H. S.) ; Tuakau ; Wairangi (A. Suter) ; 

 Hunua Range (Major Broun) ; Seventy-mile Bush ; Forty-mile Bush 

 (H. S.) ; near Wellington. 



Remark. The species is not recorded from the South Island. 



3. Flammulina compressivoluta, Reeve, 1852. Plate 26. fig. 14, a, b. 



Helix compressivoluta, Reeve, Conch. Icon., vii, pi. 130, f. 791. Amphidoxa 

 compressivoluta, Reeve : Hutton, T.N.Z.I., xvi, 198. Flammulina com- 

 pressivoluta, Reeve : Hedley and Suter, P.L.S. N.S.W. (2), vii, 643 ; 

 Suter, J. de Conch., xli, 238. Helix omega, Pfeiffer, M.H. Viv., iii, 1853, 

 33 ; P.Z.S., 1852 (1854), 56. H. (Paryphanta) omega, Pfr. : Hector, Cat. 

 Land Moll. N.Z., 4. Nanina (Paryphanta) omega, Pfr., Nomencl. Hel. 

 Viv., 35. Pat-ula omega, Pfr. : Hutton, M.N.Z.M., 10. Pari/phanta 

 omega, Pfr. : Tryon, Man. Conch. (2), i, 128, pi. 26, f. 28. 



Shell small, depressed, imperforate, almost smooth, thin, shining, 

 pellucid. The only sculpture consists of oblique retractive growth- 

 striae, more distinct outside the suture, somewhat crenulating the 

 margin ; a high magnifying-power reveals traces of spiral lines. Colour 

 light fuscous-horny, the nucleus slightly reddish. Epidermis thin, 

 transparent, polished. Spire low, broadly convex. Protoconch of \\ 

 convex whorls, flat and smooth. Whorls 4. flatly com ex, rapidly in- 

 creasing, periphery acutely convex ; ba^e flatly rounded, impressed 

 in the middle. Suture impressed. la!;<> n:arivi:ed on the outer side. 

 Aperl.iii-i' oblique, Innately oval, broader than lm.'h. Perisiome simple, 

 straight, sharp. Outer lip narrowly rounded. Columella very short, 

 oblique, and arcuate. Inner lip slightly callous, reflexed above, adnate 

 in the umbilical region ; parietal wall with a thin glaze. 



