APPENDIX. 
409 
face. I have often seen them dug out of my garden, or in 
my wheat field, by the 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 4i 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 
Franklhiii, t. 3. f. 1. — Carapace convex on the sides, 
rather rugose on the sides behind, the front only slightly pro- 
duced 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 Mada- 
gascar, under the name of A. Madagascar iensis , which is 
nearly allied to the Van Diemen’s Land species, in the short- 
ness 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 parti- 
