138 



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 G. 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 

 C. 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 base 

 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 convex forwards from the suture to the 

 periphery, and another from this over the base. 



