THE MOLLUSCA HEDLEY. 



441 





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 T. 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 T. dolicha and T. cegle would belong to the former. 



I have collected T. torquatus also at Port Moresby, British 

 New Guinea. 



TRIFORIS RUBEE, 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 



