REPORT ON THE BRACHYURA. 
139 
The largest example (a female) in the Challenger series measures as follows : — 
Adult $ . Lines. Millims. 
Length of carapace, nearly . . . . . . 5-J 11 
Breadth of carapace, nearly . . . . . . 8 16 - 5 
Phymodius, A. Milne Edwards. 
Phymodius, A. Milne Edwards, Ann. d. Sci. Nat., ser. 4, Zool. xx. p. 283, 1863; Nouv. Archiv. 
Mus. Hist. Nat., vol. ix. p. 217, 1873. 
Chlorodius (section 1), Dana, U.S. Explor. Exped., vol. xiii., Crust., p. 205, 1852. 
This genus is very nearly allied to the foregoing ( Leptodius ) from which it is distin- 
guished merely by the narrower, nearly hexagonal carapace, which is lobulated not only 
in front, but also (less distinctly) in its posterior part, by the more elongated chelipedes, 
whose merus-joints in the typical species are prolonged beyond and are not covered by 
the antero-lateral margins of the carapace, and by the more or less distinctly granulated 
or spinuliferous merus, carpus, and penultimate joints of the ambulatory legs. The basal 
antennal joint is united largely with the infero-lateral process of the front in the typical 
species. The chelipedes are more or less distinctly tuberculated or spinuliferous. 
Phymodius is distinguished from Chlorodius, as restricted by recent authors, only by 
the more distinctly lobulated carapace and chelipedes. 
The following species are referred to this genus : — 
Phymodius angulatus (Milne Edwards), with vars. gracilis, Dana, and curtimanus, 
Dana. Indian Ocean to Polynesian Islands. 
Phymodius mouticulosus (Dana) = Chlorodius areolatus, Adams and White (nec 
Mdne Edwards) ; Xantho pence, White ; Chlorodius ohscurus, Jacq. and 
Lucas. Indo-Pacific Region. 
Phymodius rugipes (Heller). Red Sea. 
Phymodius macidatus (Stimpson). Tortugas ; West Indies. 
Phymodius mouticulosus (Dana). 
Xantho peuce, White, List Crust. Brit. Mus., p. 125, 1847. 
Chlorodius areolatus, Adams and White, Crust, in Zool. H.M.S. “ Samarang,” p. 41, pi. xi. 
fig. 3, 1848; nec Milne Edwards. 
Chlorodius monticulosus, Dana, Proc. Acad. Nat. Sci. Philad., p. 79, 1852, U.S. Explor. 
Exped., vol. xiii., Crust. 1, p. 206, pi. xi. fig. 9, 1852. 
I Chlorodius ohscurus, Jacquinot and Lucas, Crust, in Yoy. au Pole Sud. ZooL, t. iii. p. 26, 
pi. iii. fig. 4, 1853, had. 
I Phymodius ohscurus, A. Milne Edwards, Nouv. Archiv. Mus. Hist. Nat., vol. ix. p. 220, 1873. 
Samboangan (beach). Several specimens of different sizes were collected. 
The colour of the carapace (in dried or spirit specimens) varies from reddish or 
chocolate-brown to greyish -yellow. 
