SutEeR.—On New Zealand Mollusca. 135 
To judge from the number of whorls, the specimens are 
not adult. 
Diameter, greatest 2imm., least 2mm.; height, 14mm. 
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 shel] 
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 rhachidian, tyri- 
cuspid, 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 some- 
what larger than in the central tooth. Marginals much 
broader than long, with a tridentate cutting-point and some- 
times a minute denticle on the outer side of the base. 
6. Allodiscus rusticus, n. sp. Plate XX., figs. 837-370. 
Shell small, subdiscoidal, perforated, not shining, pale- 
horny, thin, semi-transparent, with close radiate ribs, about 
eight per millimetre, slightly simuated 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. Aper- 
ture oblique, lunar; peristome simple, acute, columella margin 
slowly ascending, callous, not reflexed. Umbilicus very natr- 
row, open, previous. Base rounded. 
Animal unknown. ; 
Diameter, greatest 44mm., least 4mm. ; height, 24mm. 
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 4. godett ; 
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. 
