206 TtlRRlflELLA. 



T. CLATHRATA, Kiener. PI. 64, figs. 2, 16. 



Whorls 18, narrow, flattened, smooth, strongly two-keeled, 

 with intermediate sulcus, and sloping concave surface to the 

 suture above ; fulvous, obscurely marked with spots or stripes pf 

 chestnut, keels paler. Length 1'75 inches. 



Australia. 



With this species I unite T. constricta, Reeve (fig. 16). 



T. CONCAVA, Martens. PI. 64, fig. 6. 



Whorls about 10, alabaster white, obliquely striulate, the first 

 two whorls smooth, the rest bicarinate, the carinse indistinct, the 

 lower one at the suture, base concave, margin of aperture deeply 

 sinuated. Length, 16 mill. 



Mauritius. 

 T. CARTNIFERA, Lam. PL 64, fig. 7. 



Whorls 15, stout, turreted, slanting on the upper part, then 

 encircled by two stout carinse, with an intermediate shallow 

 sulcus, ever} r where finely, undulately, spirally striate ; white, 

 sometimes with a violaceous tint. Length, 3'75 inches. 



? Cape of Good Hope. 

 T. GEMMATA, Reeve. PL 64, fig. 8. 



Whorls about 15, with two granulated approximate ridges 

 next the suture, and a single plain ridge at the base, concave in 

 the middle ; white, faintly stained here and there with light 

 orange brown. Length, 1*5 inches. 



Hob. unknown. 

 T. HOOKERT, Reeve. PL 64, fig. 9. 



Whorls 15, rather thin, with two sharp, remote keels and 

 slightly concave interval, lower keel doubled on the body whorl ; 

 translucent white. Length, 22 mill. 



Hab. unknown. 

 T. ACUTA, Tcnison-Woods. PL 64, fig. 10. 



Whorls 12, narrow, flat, the earlier ones smooth, then encircled 

 by a couple of slight ridges, and smaller elevated lines, the sur- 

 face between the ridges slightly concave ; yellowish white, 

 obscurely marked with chestnut. Length, 28 mill. 



Tasmania. 



Figured from a specimen. 



