289 
FU Triphora cana, n. sp. Pl. xxiii., figs. 2, 3, and 4. BLS 
Shell sinistral, solid, of 12 whorls, elongate-conical. Pro- 
toconch slightly mamillate, of two whorls; the second the 
larger, convex, with sigmoid axial bars, 16 in a whorl. Spire- 
whorls, the first with one nodulous carina, the second with 
two, the third with three, the last arising between the other 
two. Whorls sloping, the last three subconvex. Sutural 
space distinct, with a supra-sutural thread in the last six 
spaces, remaining nearly smooth. Tubercles close, about 18 
in the penultimate, joined transversely and axially (obliquely 
forwards) by stout bars which lattice the surface. Aperture 
roundly rhomboidal, scarcely pinched behind. Outer lip 
slightly retrocurrent towards the suture; basal lip in con- 
tact with the erect, solid inner lip, and crossing the colum- 
ella, where it closes in the short recurved notched, otherwise 
open canal. Base flatly convex, bounded by the nearly 
smooth peripheral lira, with a second smooth basal lira and 
a third encircling the base of the canal. The protoconch and 
first four spire-whorls are white, the rest light-brown. 
Dim.—Length, 71 mm.; breadth, 2°1 mm. 
Locality.—Type, Gulf St. Vincent, depth unrecorded, 
with 15 good and 34 moderate examples; 35 fathoms, St. 
Francis Island, 1 good; 40 fathoms off Beachport, 1 good and 
1 poor; 55 fathoms off Cape Borda, 3 good and 5 poor; 62 
fathoms off Cape Borda, 1 moderate and 3 poor; 110 fathoms 
off Beachport, 2 moderate; St. Francis Island beach, 5 good, 
1 poor. 
The species varies a great deal— 
1. In colour. The first six whorls may be white, and 
all the rest a blackish-brown. ‘The first three whorls (includ- 
ing the protoconch) may be dark-brown, and all the rest 
light-brown, with no white whorls. The three apical whorls 
may be brown, the next three white, and the rest brown, so 
connecting the previous shell with the type. The three apical 
whorls may be brown, and the seven remaining whorls quite 
white. The infra-sutural pearl row in the coloured portion 
may be dark-purple or barely tinted, the others brown, or 
the highest and lowest row may be purple and the central 
brown. 
2. In shape. In most examples, though not in the type, 
the posterior pearl row becomes larger than the others, the 
pearls being greater, and consequently closer, and are some- 
what axially elongate. When this is marked the whorl may 
be wider below the suture than above it, so as to give a more 
or less gradate appearance to the whorls. 
a 
