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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.

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.

The genus is still better known as a Silurian form, but the spinose species appear to belong exclusively to the "Lower Devonian," and are found in Britain, Europe, and the Cape of Good Hope.

The hairy and spinose kinds are invariably rejected, as were four conspicuously-coloured species. When the birds rejected a caterpillar, they plainly shewed, by shaking their heads, and cleansing their beaks, that they were disgusted by the taste. See Mr. J. Jenner Weir's paper on Insects and Insectivorous Birds, in 'Transact. Ent. Soc. 1869, p. 21; also Mr. Butler's paper, ibid. p. 27. Mr.

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.