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CRUSTACEA MALACOSTRACA. 
|. PODOPTHALMATA. 
Crustacés pediocles, Lam, Syst. An, sans Vert. p. 147, (1801). 
Podopthalma, Leach, Linn. Trans. xi, p. 307, (1815). 
Podopthalmiens, M. Edw. Hist. Nat. Crust. 1, p. 287, (1834). 
Podopthalmia, Dana, U.S. Explor. Exped. xii, Crust. part 1, p. 7, 
(1852). 
Malacostracous Crustacea having mandibles and maxille adapted for 
mastication, pedunculate and mobile eyes, and a carapace covering the 
whole or the greater part of the thorax. 
Order I. DECAPODA V. EUBRANCHIATA. 
Eubranchiata, Dana, U.S. Explor. Exped. xii, Crust. parti, p. 8, 
(1852). 
Branchie enclosed in the normal condition beneath the carapace. 
Tribe I. BRACHYURA. 
Cancri Brachyuri, Lam. (part) Syst. An. sans Vert. p. 148, (1801). 
Brachyura, Leach, (part) Linn. Trans. xi, p. 307, (1815); Latr. 
(part) Fam. Nat. p. 267, (1825); Dana, U.S. Explor. Exped. xi, 
Crust. part i, p. 58, (1852). 
Brachyures, M. Edw. Hist. Nat. Crust. i, p. 247, (1834). 
Abdomen inflexed beneath the body, without swimming appendages, 
and without vestiges of appendages to the penultimate segment. Sternum 
never linear, but of some width between all the legs, vulve always 
situated upon the sternum. Carapace greatly developed and covering 
a great part of the abdomen. Antenne with the flagella very short, 
inner with distinct fossettes. External maxillipeds operculiform, 
Buccal cavity distinctly defined in front. 
