440 FUNAFUTI ATOLL. 



Shell rather narrow, tapering to a fine and slender point. 

 Whorls fifteen. Colour ochraceous with white gemmules. Proto- 

 conch six whorled, first two together semiglobose and shagreened ; 

 remainder keeled by a single, strong, central, projecting carina, 

 which is beaded by the passage of numerous close set delicate 

 bars crossing the whorls obliquely. All adult whorls except the 

 last have two rows of gemmules, about sixteen in a row, alternat- 

 ing vertically. On the last whorl there are two additional anterior 

 rows of smaller gemmules, an incipient row on the periphery and 

 two minor scarcely beaded ridges on the base. The gemmules are 

 large and very prominent, polished and reflecting a nacreous 

 lustre, rounded anteriorly, flattened with corner angles peripher- 

 ally and shelved atop ; each is linked to its neighbours in the 

 row by a coloured ridge ; in the centre of the whorl a sharp 

 groove runs between the two rows. The surface in general is 

 decussated by faint growth lines crossing spiral engraved lines. 

 Aperture nearly perpendicular, ovate, inner lip with a thick 

 callus layer, outer lip thickened and reflected, the right margin 

 crossing the canal in a spur ; anal notch cordate, the orifice 

 taking the place of the last sutural gemmule, canal oblique, 

 moderately produced. Length 5, breadth 1 mm. 



Shallow water in the lagoon. The commonest Triforis at 

 Funafuti. 



Prominent characters which distinguish this species are the 

 large, white, facetted, gemmules contrasted against the dark 

 background, the one-keeled apex, and the peculiar anal notch. 



TRIFORIS TORQUATUS, sp. nov. 



(Fig. 28). 



Shell moderately broad. Whorls fifteen, suture sharply im- 

 pressed. Colour orange buff; on the ninth and tenth whorls 

 the lower rows of gemmules are chocolate, and on the last row two 

 narrow bands of chocolate cover two anterior rows of gemmules, 

 stain the lip and wind down the throat ; on the eleventh, twelfth, 

 thirteenth and fourteenth whorls, the lower lines of gemmules are 

 white ; the seventh and eighth whorls are entirely white. Proto- 

 conch six whorled, first two together semiglobose, remainder 

 keeled by a single, strong, central, projecting carina, which is 

 beaded by coarse, slightly oblique bars. All adult whorls, except 

 the last, have two rows of gemmules, about seventeen to a row, 

 alternating vertically. On the last whorl there is in addition a 

 peripheral and two basal ridges, all scarcely beaded. On the 

 penultimate whorl a thread appears in the space between the 

 gemmules, and follows the sinuations of the upper tier as far as 

 the aperture without gaining equal rank. The gemmules are 

 polished hemispherical bosses, shelved above, distant about half 



