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APPENDIX. 
As we have three very distinct species which have not 
yet been described or figured in any of the works which 
have passed under my inspection, I shall proceed to detail 
their peculiar characters and give figures of their more 
characteristic features. 
The drawing of 64 the Ukodko or smaller Murray cray- 
fish” most nearly resembles Astacus quinque-carinatusj 
but it is three or four times larger than any of the 
specimens of that species which we possess, and the figure 
does not shew any indications of the five keels on the front 
of the head. In wanting the keel on the thorax it agrees 
with an Australian species described by Mr. Milne Edwards 
under the name of Astacus Australasiensis , said to come 
from New Holland, and to be about two inches long, while 
Mr. Eyre’s figure is more than six inches, and is said not 
to be taken from a large specimen. It differs from Mr. 
Milne Edwards’ figures, in having only one spine on the 
wrist, so that probably there are still two more species of 
the genus to be found in Australia. 
Mr. Eyre in his notes states — 4 ‘ The Fresh water cray- 
fish, of the smaller variety ; native names, eu-kod-ko, or 
koon-go-la, is found in the alluvial flats of the river Murray, 
in South Australia, which are subject to a periodical flood- 
ing by the river; it burrows deep below the surface of the 
ground as the floods recede and are dried up, and remains 
dormant, until the next flooding recals it to the surface ; at 
first it is in a thin and weakly state, but soon recovers and 
gets plump and fat, at which time it is most excellent eat- 
ing. Thousands are procured from a small space of ground 
with ease, and hundreds of natives are supported in abun- 
dance and luxury by them for many weeks together. It 
sometimes happens that the flood does not recur every year, 
and in this case the eu-kod-ko lie dormant until the next, 
and a year and a half would thus be passed below the sur- 
