February, 1937 The Queensland Naturalist 
27 
but if put into a glass of sea water will come' out of their 
shell in all their glory and try to get away to another 
hiding place; that is the time when I get a magnifying- 
glass on them to study them, make sketches, colour notes, 
etc., on the spot. When once they have the water well 
slimed up and find they cannot escape, they retire into 
their shell and nothing on earth will coax them out of it 
again. 
The coastal fauna here is distinct from the island 
fauna or the Reef fauna. Coastal shells are mostly larger 
than the Reef ones of the same species. At low fide Cow- 
ries are found hiding under large stones and coral lumps 
on the reefs, though in some cases you can find them 
clinging and moving over the surface of the rocks or coral 
lumps. 
Following along the beach from Emu Park round 
Boyd Point to Shoalwatefi Bay, at low or nearly low tide, 
one can walk to the shoal of rocks off the beach. One 
Sunday I waded out into the fast ebbing tide and started 
the hunt. 
I got some Gratiadusta xanthodon Sby., a dark blue 
shell, reddish base and brown spots on it. The mollusc 
has a transparent pale-green mantle, giving it with the 
darker shell below a light khaki hue; when dry it has red 
dots on the mantle which, when in water and viewed 
under the magnifying glass, are seen to be branched hairs 
or feelers of a bright brick-red colour, waving to and fro 
in the water. Along the edge of the mantle is a pale red 
stripe. Feelers or tentacles are red, siphon pinkish, mouth 
red, foot pale green and creeping disc a yellowish white 
(usual colour). 
Another shell is “ Erronea” (unnamed — Iredale). 
It has been reported under a dozen or more names. The 
shell is dark blue, with two or three broad paler strioes, 
white base. Some shells have a dark brown patch on the 
back. The mollusc is pure white, covered all over with 
black dots which give it a grey mottled appearance. The 
top of the foot is white, with fewer black dots on it raised 
more at the back then at the front. The feelers and 
mouth are red and the siphon white. Paulonaria macula 
{ which has a brick-red mantle, is also occasional! v 
found. 
At the Keppel Islands I have found and collected: — 
Lyncina vanelli L. (late lyn ) . 
Ponda carneola L. A jet black mouth. 
Mystaponda vitellus L. 
Pavitrona caput serpentis L. 
Erosaria erosa L. 
