180 Transactions.— Zoology. 
Distinguished by its keeled whorls. 
Animal unable to withdraw completely into its shell; the mantle rather 
broadly reflected over the margin; eye-peduncles short and stout, separated 
at their bases ; orange-yellow, the upper sides thickly marbled with black ; 
head between the peduncles bright orange; the peduncles and tentacles 
black. 
Jaw nearly straight, thin, striated in the centre, and slightly folded 
towards the ends. 
Dentition, 28-1-28. Laterals about 9. 
Central tooth rectangular, rather longer than broad; the reflexed por- 
tion tricuspid, the lateral cusps Hollowed on the outer side, median cusp 
clavate, reaching nearly or quite to the posterior margin of the base. The 
laterals are like the central tooth, but the cutting point on the median cusp 
gets larger as they recede from the centre; the outer laterals have a small 
point on the inner cusp, and the outer cusp vanishes, Inner marginals 
bicuspid, each with a cutting point, the inner of which is the smaller; the 
middle marginals have about 5 points, of which the two inner are much 
larger; in the outer marginals these two larger points diminish, and at last 
all disappear. 
Hab. Greymouth (R. Helms). 
AMPHIDOXA LAVINIA, D. 8 
Shell sub-discoidal, umbilicated, ribbed ; colour yellow horny, mottled 
with rufous on the upper side. Spire flat; periphery rounded; suture 
scarcely impressed ; whorls 84, rapidly vani, rather flattened above, 
rounded below; upper surface not shining, evenly and closely ribbed ; ribs 
about 18 in the tenth of an inch; lower surface smooth, shining, longi- 
tudinally striated, and irregularly spirally striatulated ; umbilicus mode- 
rate, showing all the whorls; aperture oblique, rotundly lunar; peristome 
thin, the margins approaching; columellar margin not reflected. Greatest 
diameter °5, least ‘4; height :25 inch. 
Hab. Palmerston, Wellington (T. W. Kirk). 
CHAROPA MIRANDA, n.s. Pl. ix., fig. w, and pl. xi., fig. s. 
Shell minute, depressed, imperforate, finely ribbed; colour pale horny 
tessellated with rufous. Spire flatly conoidal, obtuse; whorls 5-6, rounded, 
very slowly increasing ; the first smooth, the second and third with rather 
distant, delicate ribs, which get closer and after the third whorl are very 
close and fine, about 50 in the tenth of an inch; umbilicus very narrow, 
covered ; suture impressed ; aperture subvertical, lunate ; peristome simple, 
about three-fourths of a circle, the columellar margin slightly callous and 
reflected. Greatest diameter «15, least ‘14; height ‘11 inch, 
