REPOET ON THE BRACHYURA. 
169 
Family II. P ortunida. 
Portuniens, Milne Edwards (tribe), Hist. Nat. Crust., vol. i. p. 432, 1834. 
., A. Milne Edwards (family), Archiv. Mus. Hist. Nat., vol. x. p. 311, 1861. 
Portunid.ee and Platyonydudee, Dana, IJ.S. Explor. Exped., vol. xiii. Crust. 1, pp. 267, 290, 
1852. 
Carapace (in the recent forms at least), depressed, usually more or less hexagonal, 
never very convex. Fifth pair of ambulatory legs nearly always natatorial, with the 
dactylus ovate, expanded, and lamellate. 
Species marine or littoral. 
The genera of this family have been grouped under the following primary 
sections : — 
I. Portuninse. II. Podophthalminse. 
Section I. Portuninse. 
Portuniens normaux, A. Milne Edwards, Ann. d. Sci. Nat., ser. 4, vol. xiv. p. 225, 1860; 
Archiv. Mus. Hist. Nat., vol. x. pp. 311, 312, 1861. 
Carapace moderately transverse, and usually widest at the last antero-lateral 
marginal spine. Front horizontal, and not spatuliform. Orbits and eye-peduncles of 
moderate length ; the spine or tooth at the exterior angle of the orbit does not project 
laterally beyond the antero-lateral marginal teeth ; of these more than one (usually from 
five to nine), are developed. 
In the following classification, which is a modification of that proposed by A. Milne 
Edwards, the recent genera of this section are subdivided into four groups or subfamilies. 
Subfamily 1. Lupin a;. 
Lupeens, Carupiens, Dupocydiens, A. Milne Edwards, Archiv. Mus. Hist. Nat., vol. x. p. 311, 
1861. 
Carapace transverse, with the antero-lateral margins oblique, and usually armed with 
more than five (from five to nine) marginal teeth. Basal antennal joint moderately 
developed. Chelipedes usually elongated. Fifth legs natatorial, with the terminal joint 
expanded and ovate. 
1. Flagellum occupying the interior orbital hiatus. 
Genera : — Neptunus, de Haan ( = Euctenota, Gerstaecker ; Posidon, Herklots, and 
' lArenseus , Dana), with the subgenera Amphitrite , de Haan ( = Pontus, de 
Haan), Achelous, de Haan, and Hellenics, A. Milne Edwards ; Callinectes, 
Stimpson ; Xiphonectes, A. Milne Edwards ; Scylla, de Haan ; ? Lupocyclus, 
Adams and White (with subgenus Parathranites, nov.) ; ? Carupa , Dana. 
(ZOOL. CHALL. EXP. — PART XLIX. — 1886.) Ccc 22 
