47 
1876. Plagusia, Miers, Catal. Crust. New Zealand, p. 45. 
1900. Plagusia, Alcock, Journ. Asiat. Soc. Bengal, V ol. 
EXE Pt.2; ph 426: 
1900. Plagusia, M. J. Rathbun, Proc. U.S. Mus., Vol. 
MIL. pps 277; 2. 
The genus originally included a species for which de Haan 
instituted his Acanthopus, using a pre-occupied name, for which 
Miers in 1876 substituted Leiolophus. In the latter, the fourth 
joint of the maxillipeds is much narrower than the third, instead 
of being equal to it in breadth. Lezolophus, as Miss Rathbun 
has discovered, is superseded by Percnon, Gistel, 1848. 
Plagusia capensis, de Haan. 
1835. Grapsus (Plagusia) capensis, de Haan, Crustacea Japo- 
nica, decas secunda, pp. 31, 58. 
1837. Plagusia tomentosa, Milne-Edwards, Hist. Nat. Crust., 
Vol. Il. ps 92: 
1838. Plagusia tomentosa, McLeay, Zool. South Africa, Invert., 
p. 66. 
1843. Plagusia tomentosa, Krauss, Siidafrik. Crustaceen, p. 42, 
Pl. 2, fig. 6 (front part of carapace). 
1846. Plagusia chabrus, White, Ann. Nat. Hist., Vol. XVII., 
P. 497. 
1852. Plagusia tomentosa, Dana, U.S. Expl. Exp., Vol. XIII., 
Pp. 370. 
1878. Plagusia chabrus, Miers, Ann. Nat. Hist., Ser. 5, Vol. I., 
bs 052: 
1882. Plagusia chabrus, Haswell, Catal. Austral. Crust., p. I11. 
1886. Plagusta chabrus, Miers, Challenger Brachyura, Reports, 
Vol. XVII; p: 273; Plegaries ad (cheliped): 
In describing his Plagusia dentipes, de Haan says that in the 
third and fourth legs the femur (or fourth joint) is armed on the 
anterior carina with five strong equal teeth, and that the median 
process of the front in the carapace is dentate, with six short 
teeth. From this he distinguishes P. capensis as having the 
femora in question armed on the anterior margin with ten 
unequal teeth, and the median process of the front granulate 
on the margin. While engaged on that part of his History of 
Crustacea, which appeared in 1837, Milne-Edwards was still 
unaware of these two descriptions, though acquainted with 
de Haan’s figure of P. dentipes. Krauss, who gives references 
both to Milne-Edwards and to de Haan, does not explain why 
