119 
S.A* NAT., VOL. XV. 
Sept. 20th., 1934. By Bernard C. Cotton and F. K. Godfrey. 
than the furrows; body whorl equally and regularly cingulated, 
base convex; aperture oval; outer lip thin, crenated on the mar¬ 
gin; columella thin, but slightly thickened above, and abruptly 
attenuate to the front, scarcely reflexed; umbilical groove smooth. 
Height 10, diam. 4.5 mm. Gulf St. Vincent (numerous locali¬ 
ties) (South Australia) to Bunburv (Western Australia)—beach 
—also dredged to 55 fathoms. Type locality—Rovston Head, 
South Yorke Peninsula, South Australia). This species resem¬ 
bles L. lineolaris in outline, but differs by its conspicuous cin- 
guli, its convex whorls, and linear suture. Operculum horny, 
multispiral with five or six revolutions, nucleus central. To the 
margin of the horny operculum is attached a thin membrane, 
rather less than one half as wide as the spiral; radially striated 
ir a slightly wavy manner, though absent in the earlier whorls, 
doubtless worn away; it is ragged on the next to the last whorl. 
Radula formula oc (5.1.5) oz . There is a central tooth nearly 
circular or quadrate, with a central projection in the free edge; 
then follow five laterals on each side with a thickened outer 
border, and with the free margin bent over throughout the 
whole extent; these eleven central denticles have no serrations; 
then come some short stout uncini, which gradually become 
longer and narrower and finally are subulate. The number of 
these margined denticles, which gradually change their form, is 
indefinite. Shell very variable. The following forms occur in 
the South Australian Museum collection: — 
1. Sides amost quite straight, but distinctly furrowed at suture 
and markedly spirally sharply lirate; apex stepped. This 
is typical. 
2. Straight sided, furrowed at suture, no spirals on sides or 
base. 
3. Straight sided, furrowed at suture, spirals on base. 
4. Straight Sided, no sutural furrow, no spirals. 
5. Whorls rounded, no spirals, no sutural furrow. 
6. Whorls rounded, no sutural furrow, spirals all over. 
7. Straight sided, sutural furrow, marked spirals, oblique axial 
costae. 
8. Straight sided, no sutural furrow, marked spirals, no axials. 
9. Protoconch red, elsewhere white, with red axial flames, red 
around aperture; some specimens from beach, King George 
Sound. 
10. White with faint pink dots; an example from 55 fathoms 
off Cape Borda. 
11. White on upper three whorls, pink in lower three, with a 
white base; from 55 fathoms off Cape Borda. 
