148 ' Mr. E. J. Miers on the Plagusiinz. 
The crustaceans of this group are found in nearly all the 
tropical and warmer temperate seas of the globe. 
PLAGUSIA. 
Plagusia, Latr. (part), Gen. Crust. et Ins. i. p. 83 (1806); M.-Edw. 
(part), Hist. Nat. Crust. ii. p. 90 (1837); Ann. Sci. Nat. (sér. 3) 
ool, xx. p. 178 (1853), &e. 
Philyra (subgen.), De Haan, Faun. Japon. Crust. decas ii. p. 31 
(1835). 
Outer maxillipeds with the third or merus joint well deve- 
loped, as broad as the preceding joint. (Male genital appen- 
dages of the first pair without a terminal claw.) 
§ 1. Merus joint of the ambulatory legs with a terminal and 
subterminal spine on its upper margin. 
Plagusia tuberculata. 
Plagusta squamosa, Lamarck, Hist. An. sans Vert. p. 246 (1818) ; 
M.-Edw. Hist. Nat. Crust. ii. p. 94 (1837), nec Herbst. 
Plagusia tuberculata, Lamarck, /. ec. p. 247 (1818); Latr. Encyel. Méth. 
x. p. 146 (1825), Atlas, Crust. pl. ecev. fig. 1 (1818); M.-Edw. 
Hist. Nat. Crust. ii. p. 94 (1837). 
Plagusta orientalis, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 103 (1858) ; 
Ann. Lyc. Nat. Hist. New York, vii. p. 231 (1860). 
The carapace is covered with numerous small, often de- 
pressed tubercles, each of which is bordered by a fringe of 
short stiff hairs. The lobe above the bases of the second and 
third ambulatory legs is prominent, subacute, and not den- 
tated. The terminal segment of the male postabdomen is 
broadly semioval and rounded at its distal extremity. 
This species is probably common and widely distributed 
throughout the whole Indo-Pacific region. 
Specimens are in the British-Museum collection from 
the Mauritius (Leach’s coll.), Red Sea (Lurton), Australia 
(Gould). 
It has been recorded by Milne-Edwards from the Indian 
Ocean ; and by Stimpson (under the name of P. orientalis) 
from Hong Kong, the Hawaiian Islands, and Cape St. Lucas 
in California. Probably also the specimens recorded by Heller 
(Voy. Novara) from the Red Sea, Nicobars, Madras, and 
Sydney belong here. 
This species was first distinctly characterized by Stimpson 
under the name of P. orientalis; but it would appear that 
Lamarck’s earlier name of P. tuberculata must be adopted for 
it. His specimen was from the Mauritius, and is referred by 
Milne-Edwards to his Plagusia squamosa. 
