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This is a most variable little species, both in shape and 
ornament. From single specimens several species might be 
created, but examination of a large number of individuals 
combines them all into one. 
The shell may be comparatively long in the spire and 
narrow, or very short and broad; the whorls may be sloping 
and flat, or quite convex, and sometimes tumid beneath the 
suture, and the outer lip may be straight, or curved, or 
medially compressed. I have sought to separate a form 
which might be distinguished as C. tenisoni, Tryon, but with- 
out success, and have to coincide with Crosse that this species 
(nom. mut. for C. minuta, Tenison-Woods) is a synonym of 
OC. angasi, Brazier. The colour markings have been studied 
very elaborately, and are described somewhat exhaustively 
below. I may say that the varying shapes may be found in 
the different groups of colour ornament, hence the impossi- 
bility of distinguishing two or more species. 
The species show the following colour variations : — 
A. It has a white band round the middle of the body- 
whorl, appearing partly above the sutures in the spire, with 
bold white S-shaped marks, and a spotted white spiral over 
the back of the canal, with brown crescents convex forwards 
a little below the suture, and brown axial hair lines to the 
base, interrupted by the peripheral white band. 
B. There may be in addition a row of brown crescents 
convex forwards above and below the peripheral white band 
between the ends of the S-shaped marks. 
C. There may be infrasutural brown crescents and axial 
brown hair lines to the base, uninterrupted by any peripheral 
white band. 
D. There may be an articulated opaque white spiral just 
above the periphery, and another narrower a little below it ; 
the space between them being translucent white, and axial 
brown hair lines from this to the suture above and the baso 
below. 
E. From the back of the aperture the base of the body- 
whorl is blackish-brown, abruptly lined above by the peri- 
pheral white spiral, and traversed below by a white spiral 
line just above the engraved spirals over the canal. 
F. Shell white or brown or light-brown, with dark purple 
tips, simply pencilled axially with brown hair lines. 
A second series is found with quite a distinct type of 
colouration, the hair lines being absent. 
A. With axial brown or golden-brown narrow boomer- 
‘ang-shaped flames conyex forwards from the suture to the 
periphery, and another from this over the base. 
