¢. 7 
134 Transactions.—Zoology. | 
radiately striated, about ten riblets per millimetre, the +, 
terstices with fine growth-lines, but not reticulated. ‘Spire ie 4 
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 8}mm., least 74mm. ; height, 54mm, 
Hab. North Island: Toko, near Stratford (R. Murdoch), 
Note.—This pretty little shell somewhat resembles the larger 
Fruticicola incarnata of Europe. It is smaller and more 
depressed than P. cressida, Hutton, less fragile, differently 
coloured, not reticulated between the riblets, and has a calloug 
peristome. | 
Jaw (fig. 34) slightly arcuate, with an indistinct median 
projection inferiorly, with numerous vertical indistinct folds, 
ends rounded. 
Fadula (fig. 35) tongue-shaped, transverse rows of teeth 
straight, formula 29—1—29, of which 8 may be taken as late- 
rais. Rhachidian 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, Reeve, var. unicolor, n. v. 
Shell the same as in the species, but without any markings, — 
uniformly light-brown. Dentition unknown. 
Hab. North Island: Taupiri Mount (A. T. Urquhart). 
5. Allodiscus smithi, n. sp. Plate XX., figs. 36-360. 
Sheil 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 beautifa*y 
reticulated. Spire flat; embryonic whorl spirally striate 
periphery rounded. Whorls 4, the first three slowly, the las 
more rapidly increasing, rounded ; suture impressed ; peta 
rounded. Aperture oblique, lunar ; peristome straight, nee 
margins distant, but little converging, columella margin ~ es 
reflexed above. Umbilicus previous, very marrow. 4 
rounded, | 

