68 THE AUSTRALIAN NATURALIST. 
When turning over logs in different parts of New South 
Wales, such as in the South Coast district and on the Blue: 
Mountains, one frequently finds a large slug having a red © 
margin round the lower edge of its body and a triangular 
shield, also bordered with red, near the head. This is Azie- 
tea graffei, a peculiar slug possessing only two tentacles or 
horns, the usual number in other slugs being four. Another 
species, wenella bitentaculata, occurs in New ‘Zealand, and has 
a beautiful pattern resembling the venation of a leaf on its 
dorsal surface. If I mistake not, these are the only known bi- 
tentaculate-slugs. Specimens of both are exhibited, some of 
A. graffei being alive. 
An interesting fresh-water crustacean, 4 pus, occurs in Aus- 
tralia in common with many other countries. It is furnished. 
with a peculiar carapace deeply notched behind where the. 
long jointed tail protrudes. It is probably the largest exist- 
ing Entomostracan (literally ‘‘shelled-insect’’), and is the most 
archaic type of living crustacean. For my specimens I am in- 
debted to Mr. Froggatt. 
When in Brisbane some years ago my attention was directed: 
by my friend, Mr. W. E. Appleby, to a little mason wasp, 
Alastor eriurgus, Saus., which normally constructs its brood’ 
cells of clay. Finding the gum which exudes from the intro- 
duced Mango trees a convenient material for the purpose, the 
insect has taken to using this for its cells. But after a time: 
the mango gum becomes exceedingly hard and tough, with the. 
result that the young wasps are unable to cut their way out, 
and so perish in the cells. The specimen of mango-gum cells 
which I have here shone a young wasp which has met this 
fate. 
In the mangrove swamps of Queensland, many of the South. 
Sea Islands, Malaya and other places, a very curious little 
fish is to be seen in large numbers leaving the water and hop- 
ping about with great speed and agility on the muddy banks 
and even amongst the branches of the trees. This is /eirop- 
thalmes kohlreutheri, Pallas, the climbing fish. It is a true 
goby, and the hopping motion is performed by means of 
the strong pectoral and ventral fins. You will notice from the- 
specimens how prominent are the eyes, the fish has the power 
of moving these about somewhat after the manner of the stalk- 
eyed Crustacea. The late Rev. Tenison-Woods mentions that 
the Malays call it Ikan lesah—the restless fish—and that 
though it is eaten by the poorer classes, it is not considered 
wholesome food. 
Everyone here has many times seen stuffed specimens of the: 
Platypus, that wonderful anomalous monotreme, the most 
bird-like of all mammals. For a long time Piece was much 
doubt about the reputed egg-laying habit of this creature, but 
