terior is white or brown, shining and smooth. On rocks 
near low-water mark. 
Found from Cook Strait southward. Dunedin; Camp- 
bell, Auckland and Chatham Islands. 
THAIS SUCCINCTA (Thais, wife of Ptolemy Soter 
I.; succincta, tucked or girded up).—This Dog winkle is 
a larger species than the T. haustrum, and is white or very 
light brown in colour. The high shoulder of the body 
whorl is round, rather than square, and the thick, promi- 
nent ribs running spirally round the shell make it a simple 
matter of identification. There is considerable variation 
in the sculpturing, the majority having eight pronounced 
and cord-like ribs spirally arranged on the body whorl, 
with deep spaces between them, while others have larger © 
and smaller ribs, or small ribs only; but, whatever the size 
of these ribs, there are never, by any chance, more than 
eight principal ribs—a point to remember. The aperture 
is of a rich golden cream colour, shading off to white in 
the interior of the shell. Found among rocks near to low- 
water mark. 
Throughout New Zealand; Mount Maunganui; Chat- 
ham Islands. 
MITRELLA CHOAVA (wmitrella, dim. of mitra, a 
bishop’s mitre; choana, a funnel).—This small spiral uni- 
valve—a quarter of an inch high—is of a dark brown col- 
our, thin, with a sharp spire, a few spiral grooves on the 
base, and very fine growth lines. The colour variation is 
considerable. It may be plain dark brown, with or without 
a pale band below the suture of each whorl, or with tri- 
angular white spots, or the whole shell may be yellowish 
or greenish white, with wavy brown lines arranged longi- 
tudinally. The aperture is about equal to the spire in 
height. Found under stones and on seaweed near to low- 
water mark. 
Throughout New Zealand. Mount Maunganui; Chat- 
ham Islands. | 
MITRELLA PAXILLUS (mitrella, dim. of mitra, a 
bishop’s mitre; pa-villus, a peg).—A small, sharply-pointed, 
slender, smooth spiral univalve of about six whorls, the 
two uppermost comprising the protoconch, which is almost 
black and highly polished; the spire is about one and 
a-half times the height of the aperture. The sculpture is 
almost negligible, there being little more than growth lines 
to be seen, and perhaps a few spiral grooves at the base. 
The mouth is rather oval, channelled above slightly, and 
73 
Plate IV 
Jo. 
Plate VIII 
No.2 
Plate VIII 
No. 3 
Sea Shells 
of New Zealand 
