radiately striated, about ten riblets per millimetre, the interstices with fine growth-lines, but not reticulated. Spire depressed, conoidal; embryonic whorl slightly radiately striated; periphery angulated. Whorls 5, slowly and regularly increasing, flatly rounded, suture impressed, last whorl not descending in front. Aperture transverse, oblique, ovatelylunar. 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 columellar callosity in adult specimens; young forms are narrowly perforated or subperforated. Base rounded.

Diameter, greatest 8 ½mm., least 7 ½mm.; height, 5 ½mm.

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 callousperistome.

Jaw (fig. 34) slightly arcuate, with an indistinct median projection inferiorly, with numerous vertical indistinct folds, ends rounded.

Radula (fig. 35) tongue-shaped, transverse rows of teeth straight, formula 29—1—29, of which 8 may be taken as laterals. Rhachidian tooth longer than broad, tricuspid, median cusp reaching to the end of the base and its broad, short, cutting-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. 36–36b.

Shell 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.

To judge from the number of whorls, the specimens are not adult.

Diameter, greatest 2 ¼mm., least 2mm.; height, 1 ¼mm.

Hab. South Island: Mount Somers.

I owe my specimens to the kindness of Mr. W. W. Smith, of Ashburton, in whose honour the shell is named. This shell is very distinct from all the other known species of Allodiscus.

Jaw horse-shoe shaped, composed of about twenty-eight vertical narrow plaits, indenting both margins; a slight median projection inferiorly; ends blunt.

Radula tongue-shaped, the transverse straight rows of teeth consisting of 15—1—15, of which four are laterals. Central tooth rectangular, longer than broad, tricuspid, the median cusp with its short cutting-point extending to the posterior end of the base; side-cusps short, sinuated, one minute cutting-point on each. Laterals broader than the rhachidiari, tricuspid, but the inner cusp rudimentary and without cutting-point, median cusp with a short cutting-point overlapping a little the next row of teeth, outer cusp and cutting-point somewhat larger than in the central tooth. Marginals much broader than long, with a tridentate cutting-point and sometimes a minute denticle on the outer side of the base.

6. Allodiscus rusticus, n. sp. Plate XX., figs. 37–37b.

Shell small, subdiscoidal, perforated, not shining, palehorny, thin, semi-transparent, with close radiate ribs, about eight per millimetre, slightly sinuated and somewhat directed backwards; interstices with fine growth-lines, not reticulated. Spire almost flat, embryonic whorl smooth; periphery rounded. Whorls 5, slowly and regularly increasing, flatly rounded; suture impressed, last whorl not descending in front. Aperture oblique, lunar; peristome simple, acute, columella margin slowly ascending, callous, not reflexed. Umbilicus very narrow, open, previous. Base rounded.

Animal unknown.

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Diameter, greatest 41/2mm., least 4mm.; height, 21/2mm.

Hab. North Island: Thames (T. F. Cheeseman).

Note.—This species is very near A. godeti, mihi, but the spire is a little more elevated, the riblets are sinuated, directed backwards and low, whilst almost straight, elevated in A. godeti; in the latter the interstices between the ribs are reticulated, and the embryonic whorl is spirally striated. A. rusticus has much flatter whorls, and the suture less impressed.

7. Charopa anguiculus, Reeve, var. fuscosa, n.v.

The specimens obtained are not adult, but have only 4 whorls. The colour is uniformly fuscous, but in all the other characters they agree with Reeve's and Hutton's (Trans.