go TROCHIDA. 
Length, 7 ; breadth, 1. 
Common in the North, not found south of Wellington. Australia 
and Tasmania. 
Genus, NERITINA—Lamark. 
Operculum shelly, the outer surface smooth, with two apophyses, 
the upper shorter, sometimes dilated and crested, the lateral in the form 
of an arched rib. Shell globose, oval, thin, covered with a horny ept- 
dermis ; aperture semi-lunar; inner lip straight, flattened, the margin 
smooth or denticulated ; outer lip simple internally. 
Generally fresh water, but sometimes brackish or salt water. 
N. zealandica, Recluz, P.Z.S., 1845, p. 120. Shell ovato-oblong, 
ventricose, thin ; whorls 3—4, upper often eroded, the last horizontally 
compressed near the suture ; black, thickly painted with grey longitudi- 
nal angled lines, sometimes yellowish above, and broadly fasciated 
below ; columella sub-compressed, saffron-yellow, margin denticulated 
and scarcely arched in the middle ; outer lip thin, dirty reddish, interior 
milky, and slightly thickened (Recluz.) 
Height, 8 ; breadth, °3 inch. 
“New Zealand ; on stones in mountain streams.” 
The locality is probably erroneous, but I have re-produced the des- 
cription, as it has been overlooked in former lists. 
FAMILY—TROCHID. 
Radula elongate, rachis teeth broad, laterals five, denticulated, 
uncini very numerous, slender, with hooked points. Head proboscidi- 
form ; tentacles subulate, sometimes ciliated ; eyes on free peduncles at 
their outer bases ; two more or less developed head lobes between the 
tentacles ; gill single, long, and linear; sides of the foot. with a large 
neck lappet near the eye peduncle, continuous with a conspicuous side- 
membrane bearing on its free margin from three to five tapering fila- 
ments ; operculigerous lobe often ornamented with cirri ; operculum 
horny, spiral, often with a solid convex calcareous coat ; rarely wanting. 
Shell pyramidal, turbinate or ear-shaped ; aperture pearly within. 
Sub-Family—Turbinine. 
Operculum orbicular, horny, with a solid, convex, calcareous coat. 
Shell turbinate, the last whorl rounded and ventricose ; aperture sub- 
circular ; inner lip smooth, simple. 
Genus, TURBO—Linnezus. 
Turbinated, solid ; whorls convex ; aperture large, rounded, slightly 
produced in front ; operculum shelly and solid, callous outside, inter- 
nally horny and pauci-spiral. 
T. smaragdus, Martyn; Lamark, Lc, ix. p. 194; QO. & Gs; 
Zc, i, p. 219, pl. 60, f 6-8 ; Adams’ Gen. of Moll. pl. 43, f- 1 ; Chenu, 
Ji 2532. Sub-globose, imperforate ; smooth, or slightly roughened with 
