THE MOLLUSCA—HEDLEY. 44] 
Fig. 28. 
their own diameter from their neighbours in a row, and linked 
to them by an inconspicuous raised coloured ridge. Between the 
gemmules the surface is microscopically shagreened and finely 
spirally grooved. The aperture is perpendicular, and nearly 
square ; outer lip thickened and reflected, the right margin 
crossing the canal in a spur; anal notch deep ; semicircular canal 
short, blunt, oblique. Length 5, breadth 2 mm. 
Several specimens alive in the Funafuti lagoon. 
The peculiar colouration of this species facilitates recognition. 
Even the unaided eye can detect the two chocolate lines on the 
base and spire, and the white spiral band ascending the inter- 
mediate whorls. This colour scheme I have endeavoured to 
convey in Fig. 28. 
In colour 7’. cinguliferus, Pease, appears to resemble torquatus, 
but the figure given by Langkavel, copied and coloured by Tryon, 
represents a stouter shell with a different aperture. 
The group (Mastonia, according to Tryon) to which this belongs, 
might be conveniently divided into two sections, having a one- 
keeled and a two-keeled protoconch, respectively. The present 
species with 7’. dolicha and 7. egle would belong to the former. 
I have collected 7. torquatus also at Port Moresby, British 
New Guinea. 
TRIFORIS RUBER, Hinds. 
(Fig. 29). 
Hinds, Ann. Mag. Nat. Hist., xi., 1843, p. 18. 
The species before me is the most abundant, conspicuous and 
widespread of the genus in the tropical Pacific. If I have 
