R.A. NAT., VOI.. XVI. 
Dec. IS, 1934. By Bernard C. Cotlon and F. K. Godfrey. 3 
much larger altogether and with different markings.. ./. obl-usa 
Dillwyn 1817, is described as slightly conical, with spire remark- 
ably flattened and whorls marginated; base convex, with aper- 
ture roundish, and throat lead-coloured; shell coloured with al- 
ternate longitudinal undulated purple and white stripes. Height 
18, diam. 20 mm. (Type locality — (?) East Indian Seas). Med- 
ley 1917, published a full description of the animal of obtusa 
from N.S.W. specimens, which we copy for the benefit of stu- 
dents who have at hand living examples of our own zebra for 
comparison, more especially as we would not be surprised to 
find obtusa in the coastal stretch from Robe to the Victorian 
border. Medley writes: — “The animal of obtusa is splendidly 
arrayed in black and gold; the edge of the muzzle is buff, fol- 
lowed by, first, a band of black and then one of orange, the 
forehead-flaps are edged with orange, the ocular tentacles are 
orange below and black above, and the cervical epipodium is 
orange, the rest of the upper surface being black; the epipodium 
is differentiated into an anterior, median, and posterior portions; 
the latter begins just above the tail and continues a little past 
the operculum; it has a simple expanded margin, from beneath 
which spring four pairs of lash-tentacles, three of which are be- 
side the operculum, and the fourth is planted where the cervical 
meets the posterior epipodium; at the base of each is set a 
stump-tentacle, forming an uneven pair like the ocular and ceph- 
alic tentacles; the three hinder tentacles are each adnate to their 
associate stumps, but the anterior lash is parted from its stump, 
while a stump without a lash stands in the median line behind 
the operculum; another lonely stump is the cervical papilla, 
which occurs on both right and left sides; the medium epipodium 
or cervical lobe extends from the ocular tentacle to the anterior 
lash; on the right it has a plain edge and during locomotion is 
curled into a makeshift siphon and extruded beyond the lip of 
the shell; on the left, the edge is cut up into about twenty fil- 
aments; the ocular tentacles are compressed from above to be- 
low and keeled laterally, thus indicating that they are over-run 
by the epipodium, which finds its anterior expression in a pair 
of forehead-flaps on the snout; even when the animal has with- 
drawn into the shell, the epipodial lashes steal out from behind 
the operculum and softly search.” 
A. concamerata Wood 1828 ( Trochus ) (= Trochus strio - 
latus Quoy & Gaimard 1834: — T. fuligineus A. Adams 1851: 
= viridis Wood). PI. 1 , fig. 3. “Austrocochlea Grouped-in-hicl- 
ing. From its gregarious habit under rocks. Imperforate, glo- 
bose-conic, generally rather depressed, very thick, solid; yellow 
and black, tessellated or longitudinally striped, sometimes the 
