s. 
S A. NAT., VOL. XVI. 
Dec. 15, 1934. By Bernard C. Cotton and F. K. Godfrey. 
seen to be quite different on closer examination. Animal like 
A. concamerata , but the under side of the foot is green, and the 
muzzle and upper side of foot, black. 
A a del a i da o Philippi 1849 ( Trochus ) (= Gibbula depressa 
Tenison-Woods 1875: ~ Diloma australis Tenison-Woods 1876).. 
PI. 1, fig. 5. “The Adelaide Austrocochlea.” Globose conic,, 
narrowly perforate, solid; light ash colour, longitudinally mark- 
ed with numerous narrow regularly spaced olive lines, the first 
whorls bright orange coloured; spire conic, eroded; sutures lin- 
ear, impressed; whorl's five, convex, spirally grooved, grooves, 
shallow, about five on penultimate whorl; aperture oblique, lip- 
smooth and thickened within; columella not very thick, arcuate,, 
white edged, without a prominent tooth below; umbilical area 
bright green. Height 17, diam. 18 mm. Common and general,, 
on rocks, South Australia and Western Australia. Also common, 
in Victoria and Tasmania. (Type locality — South Australia. 
We designate Marino, Gulf St. Vincent.) The common form is 
a dark shell with fine axial white lines crossing the spirals; they 
may be very close together or more or less distant and vary in: 
their thickness greatly; the apical whorls when worn, are orange- 
coloured. A less common form is of a purplish-red tint with 
dark close purplish axials also with orange apices. The young 
shell of the black form with dark nucleus may have a well marked 
peripheral white band. Specimens from Venus Bay are light: 
gray with numerous fine axial black or chocolate continuous lines.. 
The protoconch mav be shining black throughout and continue: 
into the black of the adult shell; if the black should flake off, it 
displays the golden or orange layer beneath. It may be black 
In the first or second or third whorls, then creamy white with 
rusty red or brownish oblique axial lines, close set, distant, or 
interlaced, or broken into spots. Prot^conch is often eroded, and’ 
Dolished, white, orange or yellow; if not eroded the minute centre: 
nay be white, followed by black and then by orange. The spec- 
es differs from A. crinita Philippi, from Western Australia 
mly in lacking the tooth at the base of the columella; coloration 
culpture and, form are identical. The umbilicus of A. adelaidae 
s sometimes closed when adult. A. crinita also is imperforate 
A. odontis Wood 1828 {Trochus). Iff. 1, fig. 6. (= Gib- 
nil a tesserula Tenison-Woods 1880, a juvenile from Tasmania). 
The Edentulate AustrocochlcaT Globose-conic, more or less 
epressed, imperforate or very narrowly perforate; protoconch 
diite, eroded, the rest of the shell covered with a regular, ele- 
ant, minute reticulation formed by the intersection at right all- 
ies of two sets of obliquely descending black or bluish lines; 
Dirally finely striate the striae becoming obsolete on last whorl, 
( Continued on Page 6 ). 
