43 
‘ 
under a flat rock, resting on other rocks, on the ocean side of 
Mount Maunganui, at the entrance to Tauranga Harbour.  Al- 
though there were thousands of other rocks round it, I never found 
the Hipponyx except under the one rock I have mentioned, and 
as far as I know it has never been found alive in any other part 
of New Zealand. 
DENTALIUM NANUM (Plate IX.).—Fig. 31 is like a 
miniature white tusk of an elephant. It is about 14 inches long. 
It is really a limpet, which, having chosen mud and sand as its 
habitat, has adapted itself to its surroundings and become long 
and thin, instead of broad and flat, like the rock-loving limpet. 
It is found on the West Coast of Auckland Province, especially 
between Manukau and Raglan. 
ACMA-A OCTORADIATA (Plate IX.).—Fig. 32 is one 
of the dozen Acmea found in New Zealand. It is a very flat shell, 
and lives amongst rocks in the surf. 
ACMAA PILEOPSIS (Plate IX.).—Fig. 33 is a nearly 
round, smooth limpet, the outside being blackish, spotted with 
white, and the interior bluish, with a black margin. It is about 
an inch across. 
Amongst the other ten Acmea found in New Zealand the 
most noticeable is the Acmea fragilis, a very delicate, thin, green 
shell, with narrow brown bands. There is a green ring in the 
interior of the shell. It is found under stones, and is about } inch 
across. 
PATELLA RADIANS (Plate IX., Fig. 34), and PATELLA 
STELLIFERA (Fig. 35) are two representatives of the many species 
of beautiful limpets we have. The limpet family has not had 
the attention of our scientists which it merits. The shells vary 
so much that it is extremely difficult to classify them. In the 
attempt to do so, Patella radians has been subdivided into five 
sub-species, but even this division is not a success. We have few 
more beautiful or interesting shells than limpets. We have them 
of every shape, and from three inches in width down to microscopic 
