278 
able to add nine more from other authors, and ten new forms 
now described, bringing the total to 22 species, with 4 varie- 
ties. Two dextral shells are very interesting, as are also 
three subulate species, all from. comparatively deep water. 
©@UTriphora dexia, n. sp. Pl. xxii., tigs. 6 to 0.3944 
Shell dextral, elongate conical in the earlier half, cylin- 
drical in the later; of 15 whorls, including the protoconch. 
This has two and a half turns, its whorls short and swollen 
convex, with axial costz, valid; 12 in the first whorl, 17 in 
the second ; the apex is a tiny smooth hemisphere lying hori- 
zontally. Spire-whorls not convex, suture distinct, impressed. 
The body-whorl has three openings—one a bent tube formed 
by the closure of the anterior canal; the second a bent tube 
formed by the closure of the posterior canal, and project- 
ing just below the suture; the third by the aperture which 
is complete, round, much produced into a wide tube, some- 
what effuse at its opening, and with a slightly irregular 
border. 
Sculpture.—In the upper whorls is a central prominent 
round rather rugged spiral rib, a second smaller spiral lies 
immediately below the suture, and a third is just visible 
immediately above the suture. As the shell grows the lowest 
rib gradually enlarges until in the last whorl it equals the 
central rib. This rib, at first central, gradually moves lower 
and approximates the third rib. Axial ribs, 16 in the penul- 
timate, one-fourth the thickness of their interspaces and 
somewhat obliquely antecurrent, extend between the sutures, 
validly tuberculating the central spiral and but slightly the 
sutural ones. A scar runs from a slight notch near the 
centre of the ventral border of the apertural opening to the 
extremity of the anterior tube, and another from near the 
centre of the dorsal border of the aperture to the end of the 
posterior tube, indicating the lines along which union be- 
tween the two sides of the aperture has been effected. The 
base is flatly concave with the anterior tube projecting in 
its centre, is radially engraved with curved lines, and is sur- 
rounded by a nodular pad formed by the exaggerated lowest 
spiral, which with its fellow then runs between the two closed 
canals, and fades out on the dorsum of the apertural tube. 
The upper spiral vanishes at the base of the posterior tube. 
Dim.—Length, 75 mm., including the anterior tube of 
07 mm.; width, 1°6 mm., excluding the apertural tube of 
0°6 mm. Diameter of apertural tube, 1°11 mm., including its 
reflected expansion. 
Variations.—The adult mouth may form in a shell with 
