TRIFORIS. 181 



minutely margined above and below, with two spiral rows of tuber- 

 cles, connected in each row by a spiral thread, and a much smaller 

 row of granules next below the suture. Length, 15 mill. 



West Indies, 390-640 fins. 



T. cylindrellus, Dall. (unfigured), is referred here by Jousseaume, 

 and T. abruptus, Dall. (unfigured), is said to be a variety. 



T. HEBES, Watson. PI. 37, fig. 2. 



Solid, translucent white, whorls 12, with three spiral rows of 

 strong tubercles, separated by spiral squared channels, margin of 

 base defined by a thread. Length, 6 mill. 



Tristan da Cunha Islands, So. Atlantic 0. 



T. INFLATA, Watson. PL 37, fig. 3. 



Solid, opaque, glossy, white ; whorls 13, the normal ones slightly 

 convex, with two spiral rows of tubercles, separated by a narrow 

 triangular furrow, below them is a wider furrow, extending to the 

 suture, above the suture is defined by a narrow marginal line, which 

 is undulated rather than tuberculated. Length, 5 mill. 



West Indies, 390-640 fms. 



T. ASPERA, Jeffreys. PL 38, fig. 5. 



Rather solid, nearly opaque and glossy, pale yellowish, with a 

 faint tinge of brown, apical whorls dark brown; whorls 21-22, 

 with two spiral series of strong tubercles and a subsutural series of 

 minute granules, base with two spiral lines, and defined by a strong 

 peripheral ridge, suture slight. Length, 15 mill. 



Say of Biscay ; Sciacca, Sicily ; Gulf of Mexico. 



More slender, with stronger tubercles and more abrupt base than 

 T. perversa. 



T. ASPERRIMUS, Hinds. PL 38, fig. 6. 



Whorls 24-26, angulated in the middle, with two spiral series of 

 tubercles, granularly carinate near the suture. Length, 13*5 mill. 



New Guinea. 



Distinguished by its very narrow form. 



T. GEMMULATUS, Ads. and Reeve. PL 38, fig. 7. 



Pyramidal, with abruptly plain base, pellucid white ; whorls 12- 

 15, with three distant series of granules, the central one narrow, 

 almost obsolete, causing the whorls to be concave in the middle, 

 suture defined by a marginal line. Length, 7 mill. 



China Sea. 



