a 
219 
cate anteriorly. Inner lip thin from columella to posterior 
sinus, smooth. Interior of aperture smooth. Umbilicus deep, 
“small, margined with oblique plicate tubercles. 
Dim.—Alt., 3°6 mm. ; diam., 3°4 mm. 
Locality.—Shell figured and described (in Dr. Verco’s 
collection), with four others, dredged, dead, 130 fathoms, off 
Cape Jaffa ; 300, off Cape Jaffa, seven, immature and broken, 
and six large and complete, one quite recent. 
Obs.—This shell was figured for description as a new 
species, but Mr. Hedley recognized it as his Astele bilix, which 
was an immature shell, and did not plainly reveal the aper- 
tural sinuses. He suggested its location in Watson’s genus 
Basilissa, as emended by Dall, in Bull. Mus. of Comp. Zool., 
1889, pp. 383-385. With this it corresponds closely. One 
individual shows very well the nacreous central claw-like pro- 
cess in the labrum, somewhat inflected, to which Dall refers. 
It very probably: belongs to the section Ancrstrobasis, Dall, 
though none of my shells show the internal thickening and 
grooving of the outer lip; but Dall points out that this char- 
acter only occurs in adult shells. 
Sequenzia radialis, Tate, an Eocene fossil from Muddy 
Creek, the type of which is in the Tate Museum of the Uni- 
versity of Adelaide, has the two spirals which form the 
canaliculate suture closer together than our recent form; it 
has a prominent spiral threadlet above the second spiral rib 
and the first spiral rib is absent; so the fossil is less gradate, 
and the whorls are more sloping, and have more nearly uni- 
form spirals. The base is flatter, the perforation and its bor- 
dering tubercles are larger. Dall, however, in discussing B. 
costulata, Watson, and var. depressa, Dall, notes the great 
variability of abyssal shells in general, and of that species in 
particular. The same consideration probably holds good in 
our shell, which has therefore been made only a variety of 
Tate’s fossil species. 
One individual with a perfect aperture shows the labrum 
to be very irregular, owing to the projection at the border, of 
every spiral rib and threadlet, into a minute marginal tooth, 
proportional to its size as a spiral, except those which end in 
the depth of the two labral sinuses. : 
Genus Scana, Klein. 
: cala nepeanensis, Gatliff. 
Proc. Roy. Soc., Wict., 1906, vol. xix. (mn. s.). Pt I, 
p. 1. Pl. 1, fig. 5. “Shell sand, Ocean Beach, Point Nepean.” 
One example has been found in dredge-siftings, depth 
and locality not noted, probably St. Vincent Gulf. 



