length. It lives in deeper water than the other two species. 
North and South Islands. Mount Maunganui; Oamaru ; 
Chatham and Stewart Islands. 
EMARGINULA STRIATULA (emarginula, diminu- 
tive of emarginata, notched at the margin; striatula, dim. 
of striata, striated or lined; marked with lines or scratches). 
—This is the Slit limpet, an oval-shaped greenish-white 
shell, sculptured with concentric ribs, more strongly-marked 
ribs crossing them and radiating from the apex. The apex 
is white, rather beak-like, and directed backwards. There 
is a decided fissure or slit extending upwards from the 
middle of the anterior or front margin for about one-third 
of the distance to the apex, reminding one of a cloven foot. 
The interior is smooth and glossy, and either white or pale 
grey, or greenish. The largest are nearly an inch in length. 
Some of the shells are much higher at the apex than others, 
and the shape is then suggestive of the Phrygian cap, or 
Cap of Liberty, worn by leaders of the French Revolution. 
Found at New Brighton; Hauraki Gulf; Mount Mau- 
nganui. 
SUBEMARGINULA INTERMEDIA (subemarginula, 
slightly notched at the margin; intermediate) —A rather 
narrow, oblong, white or brownish-white limpet-like shell, 
with the apex situated at a point three-quarters of the en- 
tire shell from the front. The hinder part is slightly wider 
than the front, and the sculpture consists of fine radiate 
ribs crossed by numerous small and crinkly growth lines. 
The margin is finely crenated or notched, like the teeth of 
an extremely tiny saw. There is also a very slight notch 
in the centre of the front margin, sometimes scarcely notice- 
able, though in typical specimens sufficient to warrant the 
generic appellation—subemarginula. The shell is about an 
inch and a quarter in length, sometimes a trifle more. It 
is found on sea-weed or adhering to the under surface of 
boulders just below low-water mark. : 
Great Barrier Island; Mount Maunganui; Banks Penin- 
sula. 
SCUTUS AMBIGUUS (scutum, a shield; ambiguus, 
vague, doubtful).—This is the Duck-billed limpet, so named 
on account of the shell resembling the bill of a duck. It 
is also known as the Parmophorus, from parme, a shield 
and phoreus, a bearer. It is a white, dense, oblong shell, 
shaped like a Roman shield, straight at the lateral mar- 
gins, which are parallel to each other, slightly incurved at 
21 
Plate V 
No. 10 
Plate IT 
No. 18 
Plate II 
No. 16 
- Sea Shells 
of New Zealand 
