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The little Patella australis of Lamarck belongs to Blainville’s 
genus Hipponyx. The genus is remarkable in that it is always fixed 
by a semicircular muscle, which only allows the animal a slight 
motion of elevation and depression ; it carries and hatches its eggs 
in a pocket with several cells, placed between the neck and the foot. 
The young issue from it and fix themselves on the surroundings and 
even on their parents. This species is abundant at King George’s 
Sound. 
Everywhere where sand occurs it is covered with oysters, which 
are long and wrinkled. Thus at Sharks Bay they were an agreeable 
food for us. Granite being predominant at King George’s Sound, 
it was necessary to go to a distance to obtain a species which lives 
at a moderate depth unattached. 
Figures and descriptions are given of : — 
Helix ( Bulimus ) Trilineata, new sp. 1 — -This species inhabits 
King George’s Sound, but is not as common there as the 
following. We found it on the summit of Bald Head and in a very 
circumscribed area of Princess Royal Harbour. The animal only 
emerges from its shell rarely and slowly. 
Helix ( Bulimus ) melo , Fer. 2 — This Helix is very common 
at King George’s Sound, especially on the summit of Bald Head. 
We collected them in hundreds amongst the Succineas, which are 
equally widely distributed there in spite of the dryness which ap- 
pears to exist on this mountain. Discoloured individuals are some- 
times alive. This mollusc is so timid that we could not get it to 
emerge in order to draw it. We could ascertain, however, that it 
does not differ at all from the true Helix. At the period when we 
were on the coast of New Holland, the month of October, the in- 
dividuals which we met with were nearly all dead. Can their occur- 
rence in such a large number on a mountain be due to the custom 
of the aborigines of setting fire perpetually to the bushes and 
grasses of the plains? 
Helix georgiana, new sp. 3 — -This species inhabits King George’s 
Sound. We do not know the animal. 
Vitrina nigra , new sp. — King George’s Sound provided us with 
individuals (smaller than those at Port Western) living under the 
trees, at a distance from fresh water. 
Ampullacera frag His. T amk. 4 — We collected this variety by 
handfuls on the grassy ami swampy shores of the Englishman’s 
river at King George’s Sound. It was doubtless from this locality 
that Peron brought them. 
Physa georgiana, new sp. 5 — King George’s Sound. 
Cryptostoma zonalis, new sp. 5 — This is the staple food of 
the young sea-birds. The parents have only, with one blow of the 
1 Bothriembryon kingii, Gray. 
2 Rhytida georgiana, Q. and G. 
3 Salinator fragilis, Lamk. 
* Isidora georgiana, Q. and G. 
* Sinum zonale, Q. and G. 
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