I'hfiutcokelix.} GASTROPODA. 667 



Diameter Ma]., 3-5 mm. : min.. 3-25 mm. : height. 2-5 mm. (type). 



Animal unknown. 



Type in the British Museum. 



Hob. North Island : Whangarei ; Mount Wellington ; Hunua 

 K.-inge (Major Broun) ; Tuakau ; Waimarama ; Forty-mile Bush 

 (H. S.). Stewart Island : Half -moon Bay (A. Hamilton). 



5. Phenacohelix Ponsonbyi, Suter, 1897. Plate 26, fig. 8, a, b. 



Flammulina (Phenacohelix) Ponsonbyi, Sut., P. Mai. S., ii, 285, figs, in text. 

 Patula pilula, Reeve : Hutton, T.N.Z.I., xvi, 161. Fruticicola pilula, 

 Reeve : Hutton, I.e., 194. Phenacohelix pilula, Reeve : Hedley and 

 Suter, P.L.S. N.S.W. (2), vii, 641. Flammulina (Phenacohelix) pilula, 

 Reeve : Suter, J. de Conch., xli, 249 (in part) ; Pilsbry, Man. Conch. (2), 

 ix, 16, pi. 3, f. 13 ; not of Reeve. 



Shell small, depressed globose, moderately umbilicated, thin and 

 fragile, dull. Sculpture consisting of numerous arcuate, subequi- 

 distant thread-like riblets, about 8, rarely 7 01 6, per millimetre ; all 

 the whorls microscopically spirally finely striated, the post-nuclear 

 whorls with fine interstitial growth-lines, decussating the spirals. 

 Colour pale-horny with irregular radiate dashes and spots of rufous on 

 the upper surface, passing over in zigzag lines at the base, sometimes 

 imparting a tessellated appearance to it, and extending to the um- 

 bilicus. Epidermis thin, semitransparent. Spire very little elevated, 

 very broadly conoidal. its height slightly more than one-third that 

 of the aperture. Protoconch of 1J convex whorls. Whorls 4|. regu- 

 larly increasing, flatly convex, periphery obtusely angled above the 

 middle ; base convex. Suture impressed. Aperture oblique, rotundly 

 lunate. Peristome thin, straight, regularly arched. Columella oblique, 

 arcuate. Inner lip slightly callous and reflexed. Umbilicus quite 

 open, somewhat perspective, about one-fifth of the greatest diameter. 



Diameter Maj.. 6 mm. ; min., 5-25 mm. : height, 3-25 mm. 



Anatomy. Hutton. T.N.Z.I., xvi. 161, pi. 9. f. K : pi. 11. f. M: 

 Pilsbry, Man. Conch. (2), ix, pi. 2, f. 6, 7 : Murdoch. P. Mai. S., iii, 

 322, pi. 16, f. 9-11 (all as P. pilula). 



Jaw arcuate, with about 35 flat plaits, which indent the concave 

 but not the convex margin. 



Radula having the formula, 27 4- 1 + 27. varying from 25 to 

 29 ; laterals from 13 to 15. Central tooth small, narrower in front 

 than behind, longer than broad, the reflexed portion constricted at 

 the sides, covering about half the base, with a rather large acute 

 point. First lateral like the central, but larger ; the other laterals 

 with a deep notch at the outer side of the reflexed portion, the cutting- 

 point increasing in length outwards. Marginals broader than long, 

 the inner with a cutting-point and a denticle on each side of it ; 

 the outer serrated, one of the inner points longer than the others. 

 (Hutton.) 



Type in my collection. 



