134 Transactions. — Zoology . 



radiately striated, about ten riblets per millimetre, the in- 

 terstices with fine growth-lines, but not reticulated. Spire de- 

 pressed, conoidal; embryonic whorl slightly radiately striated; 

 periphery angulated. Whorls 5, slowly and regularly in- 

 creasing, flatly rounded, suture impressed, last whorl not 

 descending in front. Aperture transverse, oblique, ovately- 

 lunar. Peristome straight, thickened with a pinkish callosity, 

 which unites the very slightly converging margins on the 

 body-whorl ; columella lip strongly callous at its upper end,, 

 slightly reflexed. Umbilicus perfectly closed by the columel- 

 lar callosity in adult specimens ; young forms are narrowly 

 perforated or subperforated. Base rounded. 



Diameter, greatest 8imm., least 7imm. ; height, 5^mm. 



Hab. North Island : Toko, near Stratford (E. Murdoch). 



Note. — This pretty little shell somewhat resembles the larger 

 Fruticicola incarnata of Europe. It is smaller and more 

 depressed than P. crcssida, Hutton, less fragile, differently 

 coloured, not reticulated between the riblets, and has a callous 

 peristome. 



Jatv (fig. 34) slightly arcuate, with an indistinct median 

 projection inferiorly, with numerous vertical indistinct folds, 

 ends rounded. 



Badnla (fig. 35) tongue-shaped, transverse rows of teeth 

 straight, formula 29 — 1 — 29, of which 8 may be taken as late- 

 rals. Ehachidian tooth longer than broad, tricuspid, median 

 cusp reaching to the end of the base and its broad, short, cut- 

 ting-point over the next row of teeth ; side-cusps with a small 

 cutting-point on each. Laterals similar to the central ; the 

 marginal teeth are tridentate, with the base short and broad, 

 median tooth long and stout, the others small ; outer marginals 

 minute, tri- and bi-dentate. 



4. Phenacohelix pilula, Eeeve, var. unicolor, n. v. 



Shell the same as in the species, but without any markings, 

 imiformly light-brown. Dentition unknown. 



Hah. North Island : Taupiri Mount' (A. T. Urquhart). 



5. AUodiscus smithi, n. sp. Plate XX., figs. 36-36^. 



Sliell minute, discoidal, perforated, silky, pale-yellow with 

 zigzag streaks of rufous ; thin, diaphanous, closely ribbed, 

 about twenty riblets per millimetre ; they are slightly arched 

 and somewhat sinuate at the periphery ; interstices beautifully 

 reticulated. Spire flat ; embryonic whorl spirally striated ; 

 periphery rounded. Whorls 4, the first three slowly, the last 

 more rapidly increasing, rounded ; suture impressed ; periphery 

 rounded. Aperture oblique, lunar ; peristome straight, acute, 

 margins distant, but little converging, columella margin slightly 

 reflexed above. Umbilicus previous, very narrow. Base 

 rounded. 



