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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. The Van Diemen's Land Cray-fish. ASTACUS FRANKLINII, t. 3. f. 1.

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. The Van Diemen's Land Cray-fish. ASTACUS FRANKLINII, t. 3. f. 1.

Inhab. Port Essington, Mr. Gilbert. The A. AUSTRALASIENSIS, Milne Edwards, Crust ii. 332. t. 24. f. 1 5. agrees with this species in the form of the beak, but the keels on the thorax are not noticed either in the description or in the figure; and the caudal lobes in the figure appear most to resemble A. FRANKLINII.

As the genus ASTACUS is now becoming more numerous in species, it may be divided, with advantage, into three sections, according to the form of the caudal lobes; thus: B. The central caudal lobe continued hard and calcareous to the end, as ASTACUS FRANKLINII of Van Diemen's Land, and A. MADAGASCARIENSIS of Madagascar; both have a very short beak, and the second abdominal ring spinose.

As the genus ASTACUS is now becoming more numerous in species, it may be divided, with advantage, into three sections, according to the form of the caudal lobes; thus: B. The central caudal lobe continued hard and calcareous to the end, as ASTACUS FRANKLINII of Van Diemen's Land, and A. MADAGASCARIENSIS of Madagascar; both have a very short beak, and the second abdominal ring spinose.

Inhab. Port Essington, Mr. Gilbert. The A. AUSTRALASIENSIS, Milne Edwards, Crust ii. 332. t. 24. f. 1 5. agrees with this species in the form of the beak, but the keels on the thorax are not noticed either in the description or in the figure; and the caudal lobes in the figure appear most to resemble A. FRANKLINII.