152 Mr. E. J. Miers on the Plagusiine. 
speckled with red. There is an irregular granulated ridge on 
the upper surface of the wrist, and an abrupt prominence 
behind the upper orbital margin, which is beaded. The buccal 
organs are wanting. This species is at once distinguished by 
the smooth and naked carapace, less deeply incised frontal 
sinuses, and the form of the hands, and appears to establish 
the transition from the Plagusiine to the Grapsine, through 
Cyrtograpsus. 
§ 2. Merus joint of the ambulatory legs with a series of spines on us 
upper margin (carapace almost entirely destitute of tubercles). 
Plagusia chabrus. 
Cancer chabrus, Linn. Mus. Lud. Ulr. p. 438 (1764); Syst. Nat. p. 1044 
(1766). 
Plagusia tomentosa, M.-Edw. Hist. Nat. Crust. ii. p. 92 (1837) ; Ann. 
Sci. Nat. (sér. 3) Zool. xx. p. 178 (1853). 
Plagusia capensis, De Haan, Faun. Japon. Crust. p. 58 (1835). 
Plagusia chabrus, White, Ann. & Mag. Nat. Hist. xvii. p. 497 (1846). 
Carapace covered with a very short close pubescence, and 
without tubercles. Front armed above with two small spines, 
and with a series of small tubercles on its anterior margin. 
Anterior legs tuberculated. Lobes above the bases of the 
second and third ambulatory legs terminating in a short 
spine. 
Si iiond of this species are in the British Museum from 
the Cape of Good Hope (Sir A. Smith, Capt. Carmichael, 
Dr. P. Hahn), New Zealand (Dr. Sinclair), and Tasmania, 
near George Town (f. Gunn). 
It has been recorded from New South Wales (Dana), Chili 
(M.-Edwards). 
It is probable that the species briefly characterized by Milne- 
Edwards (Ann. Sci. Nat. sér. 3, Zool. xx. p. 178, 1853) under 
the name of P. Gaimardi, from Tongatabu, is only a variety 
of the above. 
The first pair of genital appendages in the male are not 
twisted as in P. squamosa, and their inferior margins are thin 
and sharp-edged ; they are sometimes very slightly constricted 
towards the distal extremity, which is obtuse and subtrun- 
cated. 
Plagusia dentipes. 
Grapsus (Plagusia) dentipes, De Haan, Faun. Japon. Crust. decas 2, 
p. 58, pl. viii. fig. 1 (1835). 
Plagusia dentipes, M.-Edw. Ann. Sci. Nat. (sér. 3) Zool. xx. p. 178 
(1853) ; Stimpson, Proc. Ac, Nat. Sci. Phil. p. 103 (1858), 
This species is distinguished from the preceding by having 
