
101 
Genus Nacenra, Schumachen), 
Vi aetalan. parva, Angas. 
Hab.—One example dredged dead at 62 fathoms N.W. of 
Cape Borda: several found in shell sand, Guichen Bay, which. 
is its most easterly known station. 
—N. crebristriata, Verco. “4 
Hab.—The type locality was not exactly knéwn, but was 
judged to be Moonta Bay. I have since taken several ex- 
amples in shell-sand at Guichen Bay. ‘There are variations 
from the type. The anterior slope may be sub-convex, or it 
may be slightly excavated immediately below the apex. Some 
are more compressed laterally than the type, others tend 
more to an elliptical outline. There may be about sixteen 
equidistant pink radii, or the shell may be uniformly of a 
light pink tint. ; 
Voge N: stowe, Verco. 4 ae 
Hab.—Guichen Bay beach, in shell-sand. No variations: 
from the type. 
Family ACM AID, Philippi. 
Genus Acmaa, Eschsholtz. 
#8 flammea, Quoy & Gaimard. 
_. Patelloidea flammea, Q. & G., Voy. de |’ Astrolabe, Zool., vol. 
iii., 1834, p. 534, pl. Ixxi., f. 15 to 24. 
My observations on this variable shell in Trans. Roy: 
Soe. South Australia, vol. xxx., 1906, p. 212, were almost: 
entirely based on dredged shells. A collection since gathered 
from the rocks at Robe, Beachport, and MacDonnell Bay 
enables me to add something further. As a rule the exposed 
shells are much more eroded, and their ribs are ruder and 
less numerous, and they are of the A. jucksoniensis, Reeve, 
form rather than of the 4. crwcis, Ten. Woods. Many of these: 
were much narrowed anteriorly, so as to be really oval or 
egg-shaped instead of uniformly roundly elliptical. Some of 
the smaller individuals tend also to be pyramidal rather than 
conical, with four obsolete angles occupying the situation of 
the intervals between the arms of the Maltese cross. None 
were found with radial ribbing so fine as. presented on some: 
of the dredged specimens. 
In most the cross was plainly visible, or indistinctly when 
held up to the light. One showed the anterior and both late- 
ral arms fused into one mass, and the posterior arm very 
broad, so as to give a quite black shell with two narrow dead 
white radii at the postero-lateral parts. Another was a 
black shell with four narrow white radii. Another had five 
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