141 
all the spire whorls, in others the upper whorls show them 
plainly, but the lower whorls very indistinctly, though in the 
latter they are very valid over the base of the body whorl. 
In some L. picturata, from Port Jackson, sent to me by Dr. 
Cox, there are quite distinct indications of spiral cinguli on 
the spire whorls, though in most they are wanting. Our 
shells vary much in the convexity of their whorls. Some with 
well-marked cinguli are typically convex, others equally cin- 
gulated are almost straight-sided, whereas samples of 1. 
picturata, from Port Jackson, may be convex. I am disposed 
to think Tate's species is no more than a validly spirally 
striate variety of L. picturata, Adams. | 
The colouration of our shell is just as variable as that of 
Bankivia fasciata, Menke. It may be wholly white, or 
purple, or may be banded or spotted or flamed or blotched, or 
zig-zagged with pink, brown, or yellow, in very pretty and 
abundant variety. 
Hab.—Dredged in Investigator Strait, St. Vincent Gulf, 
Backstairs Passage, and off Newland Head; 15 fathoms, 3 
dead; 17 fathoms, 8 alive, 9 dead ; 20 fathoms, 10 dead; 22 
fathoms, 2 recent, 42 dead. 
Cassidea sinuosa, sp. nov. . Pl xxvi., figs. 7, 8, 9, 10a, b, c. 
Shell roundly oval, thin. Nucleus of two and a half 
whorls, smooth, flatly rounded. Spire whorls, three, rounded, 
with spiral lire, 13 in the penultimate ; the posterior three 
are linear and adjacent, the next three flatly rounded ; inter- 
spaces, at first equal in width to lire, but becoming gradu- 
ally narrower, till reduced to shallow, wide incisions. 
Oblique aceremental growth lines, crossing lire and inter- 
spaces. Suture linear, finely crenulate. Body whorl large. 
Suture linear, faintly channelled towards the aperture, where 
it slightly ascends. Sculptured with flat, broad, slightly 
raised liræ, least marked over the centre of the whorl; »e- 
coming gradually more valid towards the suture, and most 
valid anteriorly above the notch. Numerous subdistant, 
axial, accremental strie, crenulating the suture, more valid 
and crowded towards the aperture. Aperture obliquely oval, 
widened anteriorly, compressed for about three millimetres 
posteriorly. Outer lip sinuous, projecting for about four 
millimetres below the suture, then receding in a shallow curve 
to the notch; slightly bevelled within, and faintly toothed. 
Some callus thickening inside the posterior projection, which 
is slightly incurved. Columella moderately arcuate, nume- 
rous oblique wrinkles on the lower half. Inner lip spread 
thiekly over the varix of the notch, forming a small rhima 
above and below it, thinly but widely spread over the body 
