io) 
224 
ture. Notch well marked, margins slightly everted. Ornament, 
uniform dull salmon colour. 
Length, 19 mm.; breadth, 6°75 mm.; aperture length, 8:5 mm.; 
width, 2°75. 
Diagnosis.—It differs from M. Rosette, Ang., in the costation 
of the earlier whorls, and in the absence of the punctated spiral 
incisions. It differs from WU. Australis, Swns., in its more at- 
tenuated form, in the less abrupt contraction of the body-whorl 
below the periphery, the more uniform curve with a larger radius 
of the outer lip, and the consequent absence of the contraction 
of the lower part of the aperture; also in the relative length of 
the aperture and spire; in M. Australis, in the smaller shells, 
these are as 100 to 103°6, in the larger as 100 to 114:3, in 
M. Vincentiana as 100 to 131°4. 
Habitat.-_Investigators Straits from 13 to 15 fathoms, two 
recent; off Bank’s Islands, Spencer Gulf, in 10 fathoms, one 
recent ; Backstairs Passage, in 17 fathoms, one dead ( Verco). 
Types in my cabinet. 
Sureula Perksi, spec. nov. PI. vii., figs. 3, 3a, 3b, 3c. 
Shell fusiformly ovate, solid, imperforate. Whorls ten, includ- 
ing nucleus. Nucleus two whorls, smooth, inflated, horn- 
colored. Spire, suture distinct, impressed, finely crenulated ; 
whorls subconvex, with a groove at the junction of the upper and 
middle third, having a double row of granules just above it, and 
another row immediately below it. Numerous longitudinal wavy 
plicee, about as wide as the intervals, and not quite so high, 
rounded, about 25 in the penultimate whorl. Abundant fine 
spiral strie, 15 in the penultimate, crossing the plice, and making 
them granose. Body-whorl subinflated, contracted at the base, 
sculpture in the upper part as in the spire ; longitudinal granose 
plicee, about 40, following the sinuosities of the outer lip, lost at 
the extreme base, and becoming less valid and more crowded 
towards the aperture, cut by transverse striz, which are irregu- 
larly alternately larger and smaller. Aperture oblique, elongate- 
ovate, constricted close to the suture. Outer lip thin, sharp, 
with a well-marked sinus, about three millimetres deep, with its 
centre 2°5 mm. from the suture, with the sides convex, and a 
concave bottom at the row of tiny nodules in front of the groove; 
a shallow anterior wide sinus just behind the notch of the canal. 
Canal very short, wide, open, notch rather large, oblique, its left 
border produced beyond the right; margins slightly everted. 
Columella straight, slight sinistral deviation anteriorly, smooth 
from removal of sculpture, callus very thin, applied, inconspicu- 
ous, barely free at the anterior. extremity. Ornament greyish- 
white, with small deep rust-colored spots on the rows of grsnules 
