he men
engaged in digging ditches for irrigation. The floods usually overflow
the river flats in August or September, and recede again in February or
March. For further particulars respecting the modes of catching the
eu-kod-kos, vide vol. ii. pages 252 and 267."

"I have spoken of this cray-fish as the SMALLER variety as respects the
Murray. It is LARGER than the one found in the ponds of the river Torrens
at Adelaide; but in the river Murray one is procured of a size ranging to
4 1/2 lbs., and which is QUITE EQUAL in flavour to the FINEST lobster."

These latter have not yet been received in any of our collections, so
that we are unable to state how it differs from those now described: they
must be the giants of the genus.

1. The Van Diemen's Land Cray-fish. ASTACUS FRANKLINII, t. 3. f.
1.--Carapace convex on the sides, rather rugose on the sides behind, the
front only slightly produced and edged with a toothed raised margin not
reaching beyond the front edge of the lower orbit, and with a very short
ridge at the middle of each orbit behind; the hands compressed, rather
rugose, edge thick and toothed: wrist with four or five conical spines on
the inner side, the front the largest: the central caudal lobe, broad,
continuous, calcareous to the tip, lateral lobes, with a very slight
central keel; the sides of the second abdominal rings spinose.

Inhab. Van Diemen's Land.

Mr. Milne Edwards, (Archives du Museum, ii. 35. t. 3.) has recently
described a species of this genus from Madagascar, under the name of A.
MADAGASCARIENSIS, which is nearly allied to the Van Diemen's Land
species, in the shortness of the frontal process, the spines on the sides
of the second abdominal segment, and in the lobes of the tail; but it
differs from it in the length of the claws, and other particulars.
Madagascar appears to be the tropical confines of the genus.

2. The Western Australia Cray-fish. ASTACUS QUINQUE-CARINATUS, t. 3. f.
3.--Carapace smooth, rather convex, and with three keels above; the beak,
longly produced, ending in a spine, simple on the side and produced into
a keel on each side behind; the central caudal lobe rather narrow,
indistinctly divided in half, and like the other lobes flexile at the
end, the lateral lobes with a central keel ending a slight spine; the
hands elongated, compressed, smooth, with a thickened, toothed, inner
margin, which is ciliated above; wrist with two conical spines on the
inner side.

In