. Cuvier's animal kingdom : arranged according to its organization. Animals. 420 CRUSTACEA. claws are nearly equal, consisting also of a single species (Axius stirhynchiis. Leach) found upon the coasts of England and France. Amongst those species which have the six fore-legs forming as many didactyle claws—(a character which removes them from all the preceding Decapods, and in which they are related to the species at the head of the following section—from which, however, they differ in the fore-daws being by far the largest, the peduncle of the lateral antennae furnished with a scale or spines
. Cuvier's animal kingdom : arranged according to its organization. Animals. 420 CRUSTACEA. claws are nearly equal, consisting also of a single species (Axius stirhynchiis. Leach) found upon the coasts of England and France. Amongst those species which have the six fore-legs forming as many didactyle claws—(a character which removes them from all the preceding Decapods, and in which they are related to the species at the head of the following section—from which, however, they differ in the fore-daws being by far the largest, the peduncle of the lateral antennae furnished with a scale or spines, the outer plate of the swimmeret at the extremity of the tail appearing in all the recent species, as though it is divided into two parts by a transverse suture,)—are the following genera. Eryon, Desm., comprises a single singular fossil species found in the calcareous stone used for lithography at Pappenheim and Aichtedt, in Anspach. The carapax is [very broad], and with very deep lateral incisions. The plates of the swimmeret are pointed at the tip. The genus Astacus, Gronovius, Fabr., have the lateral plates of the swimmeret broad and rounded at the ex- tremity ; the two exterior ones with a transverse suture. The two filaments of the intermediate antennae are longer than their peduncles, with the sides of the carapax entire. In the marine species of this genus, the middle plate of the tail does not exhibit a transverse suture. Of some of these, Leach has formed his genus Nephrops, characterized by the large scale of the lateral antennae, and the long prismatic claws of the fore-legs. Type, Cancer norvégiens, Linn., a species found on our coast. The others having the lateral antennae only furnished with two short teeth or spines, and the fore-claws large and oval, form the restricted genus Astacus, Leach, the type of which is the common Lobster (Cancer gammarus, Linn.; Astacus marimis, Fabr.), of which the rostrum in front of the carapax is armed with three teeth on
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