34. 
South Australian Shells. 
S.A. NAT., VOL. XVI. 
July 24, 1935. 
SOUTH AUSTRALIAN SHELLS. 
(Including description of New Genera and Species). 
(By Bernard C. Cotton & F. K. Godfrey). 
PART XV. 
TROCHIDAE (contd.) 
Gibbula Risso 1826. Shell conoidal, umbilicate, rather 
solid; spire moderately elevated; whorls frequently tuberculate 
above and with channeled suture; smooth or spirally ribbed; last 
whorl generally angular at the periphery; aperture subrhom- 
boidal; columella oblique, dentate or subsinuous at the base; 
outer lip acute. Type — G. magus Linne. Many species which 
are nearly all littoral or laminarian in station. All seas, except 
upon the coasts of America, which have not a single species. 
Gibbula ocellina Hedley 1911 (Gibbula). “The Eye-like 
"Gibbula.” Solid, imperforate, conical, with gradate spire, pro- 
minently keeled at the periphery and again at the shoulder: be- 
low the periphery, uniform buff colour, above it, broad, radial 
stripes of buff pink, alternate with white; along the periphery 
Gibbula ocellina Hedley x 9. 
are pairs of dashes of madder-brown, sometimes these enclose 
a tinted space and have a background of opaque white, thus as- 
suming an ocellated aspect; protoconch pink; whorls five; base 
with seven flat evenly spaced concentric riblets; a strong re- 
volving cord defines the periphery and ascends the spire; the 
last and penultimate whorls have four spiral riblets above the 
periphery, the uppermost stronger and forming the angle of a 
subsutural shelf; upper whorls smooth; aperture round, outer 
lip w simple, dentate by the spirals; columella perpendicular. 
Height 3 diam. 3 mm. (Type locality — Several specimens from 
100 fathoms, forty miles south of Cape Wiles, South Australia). 
