17 
TROPHON CHEESEMANI (Plate II.).—Fig. 6 is a small, 
grey Trophon, with a dark interior. The shell is deeply grooved, 
and about three-quarters of an inch long. Found, so far, only 
on the West Coast, near Waikato Heads. We have 3 other small 
Trophons, two of which are shown on Plate VII., Figs. 22 and 23. 
ANCILLA AUSTRALIS (Plate II.)—Fig. 7 (also known as 
the New Zealand Olive) is a beautiful clean bright shell, and looks 
as if covered with shining enamel. The upper part of shells of 
the Ancilla family is kept polished by the molluse’s foot, which 
swells to such an extent when the animal is moving about that 
the whole shell is concealed in its folds. The broad band in the 
centre is usually dark chestnut or brownish purple, the points 
of the shell being tipped with darker shades of the same colour. 
The interior is purplish. Large numbers are found on the edges 
of channels in harbours, buried in the sand; but their presence 
is easily located by the oval-shaped mound under which they con- 
ceal themselves. When washed up on ocean beaches, they are 
frequently bleached to a brown or chocolate colour. The Maoris 
sometimes use them for buttons, and very pretty buttons the medium- 
sized ones make. The largest I have seen were two inches long. 
There are two other kinds of Ancilla found in New Zealand, 
the one much larger, and the other much smaller, than the one 
depicted. The larger is Ancilla pyramidalis, the smaller Ancilla 
mucronata. The native names are Pupurore and Tikoaka. 
PURPURA SUCCINCTA (Plate II.).—Figs. 8 and 9 is 
found all over the North Island, on ocean beaches and in harbours. 
It may have a comparatively smooth exterior, as in Fig. 8, or 
be deeply grooved, as in Fig. 9. The interior is usually yellow 
or brown, and generally has a pale band round the margin of the 
outer lip. It is very variable in colour and general outside 
appearance, and although at one time divided by naturalists into 
3 or 4 varieties, under different names, it is now believed to be 
only one very variable species. 
PURPURA SCOBINA (Plate II.)—Fig. 10 (late Polytropa 
scobina) is a rough, thick, brown shell, with a dark interior. It 
varies in colour and shape, and is found everywhere in New Zea- 
land on surf-beaten rocks. It is usually under an inch in length. 
PURPURA HAUSTRUM (Plate II.).—Fig 11 (late Poly- 
tropa haustrum) is a brown shell, with a greyish or yellow interior. 
It is found in great numbers on rocks in all parts of New Zealand. 
