178 TRIFORIS. 



T. TIBIALIS, Jouss. PI. 37, fig. 78. 



Solid, white, with interrupted chestnut lines, costate, granulated 

 by the crossing of four spiral Iira3 ; whorls 17, suture scarcely con- 

 spicuous ; aperture chestnut and white, maculated. Length, 13 mill. 



Tahiti. 

 T. GIGAS, Hinds. PI. 37, fig. 79. 



Long and narrow, whorls 25-28, planulate, granular in four 

 spiral series, the lower one the strongest, base granularly punctate. 



Length, 1 in. 



New Guinea. 



T. ACUTUS, Kiener. PI. 37, fig. 85. 



Shining, whitish, with numerous whorls, triseriately granular. 

 Length, 10 mill. 



Hob. unknown. 

 A doubtful species. 



T. CONCORS, Hinds. PI. 37, fig. 80. 



Whorls 22, flattened, with three spiral series of nodules, the mid- 

 dle one smallest, suture lined. Length, 14 "mill. 1 



Straits of Malacca. 

 T. DOLICHA, Watson. PI. 37, fig. 81. 



Whorls 11, flat, with channeled suture, the ribs made nodulous 

 by three spiral series of lines, base defined by a carina, two-threaded, 

 .canal short and broad ; light brown, with dark stains. 



Length, 5 mill. 



N. E. Australia. 



T. SCULPTUS, Hinds. PI. 37, figs. 82, 83. 



Light brownish, with 15-18 concave whorls, nodosely carinate 

 .above and below, with a smaller carina in the middle. 



JLength, 12 mill. 



Straits of Malacca. 



T. pyramidalis, Ad. and Reeve (fig. 83), from China Sea, appears 

 to be identical. 



T. REEVEi,.Desh. PL 37, fig. 84. 



Whitish, with a black tip ; whorls 15, narrow, each bearing a 

 row of granules above and below, the lower row smaller, concave 

 between them. Length, 5 mill. 



Isle of Bourbon. 



Smaller than the preceding, without the centre carina, but very 

 likely the same species, notwithstanding these differences. 



