a Shells 
fs New Zealand 
Plate IT 
No. 15 
Plate VII 
No. 20 
\ 
gated with the colours of the shell itself, placed lone di 
ally upon the body whorl, or there may be reduplications 
of the outer lip, as though the creature, through forgetful- 
ness, had omitted to dissolve the thickened lip, before pro- 
ceeding to form a new portion of shell to accommodate 
its increasing bulk. The shell may attain a height of three 
and a-half inches. This sub-species lives in a sandy ground. 
Found at Mount Maunganui, Hawkes Bay, and other 
places in the North Island; St. Martin’s Bay, South Island. 
TONNA VARIEGATA (tonne, anglo-saxon, a butt, or 
large cask; variegated).—The Tun shell is a very large, 
rounded, handsome univalve, comparatively thin for its 
size, and consequently often broken when met with on the 
seashore, where it is to be seen occasionally after heavy 
winter storms. It is of a rather pale, though bright yellow 
colour, with rich dark brown spots, and sculptured with 
alternate ribs and grooves of equal size, spirally winding 
round the whorls. The spire is very short, being only 
about one-fourth the height of the aperture. The mouth 
is large, and the animal has no operculum. Internally, 
the shell is yellow, very glossy, and marked with smooth 
ribs and grooves, which correspond respectively with the 
grooves and the ribs on the outside. Live shells have been 
found at Matakana Island, on the ocean side, but one of 
the best specimens I have seen, six and a-half inches long, 
by five and a-half inches wide, was picked up on the beach 
at Mount Maunganui. 
Found from the North Cape to Tauranga. Whangarei 
Heads; Great Barrier Island. 
ARCHITECTONICA LUTEA (architectonica, skilled 
in architecture; Jutea, yellow or clay-coloured).—A very 
small, smooth, polished spiral univalve, of about one-third 
of an inch in diameter, conical, with a flattened base, of 
an opaque yellowish-fawn colour, or bright bay, with a 
double row of small reddish-brown dots running round the 
suture. At the widest part, or circumference, of the body 
whorl there are two rounded ribs or keels, where the col- 
oured dots are more pronounced. At the centre of the 
base the umbilicus is open; it is a deep, funnel-shaped 
cavity, bordered with a sharply-defined margin of white, 
toothed at the free edge; this frill-like edging may be seen 
winding its way spirally upwards towards the apex of the 
shell. The species is by no means common, and occurs 
only in most restricted areas. 
Whangarei Heads; Hauraki Gulf: Mount Maunganui; 
Wellington; Chatham Islands. 
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