.are very constant and characteristic of this sjiecics- There is also 

 to be noticed a cherry red spot on the hand of the chelipeds. close 

 to the base of the movable finger. This is shown in Herbst's 

 figure, and in the South African specimen (preserved in formalin) 

 this spot still retains its colour, while the three on the carapace 

 have so faded as to require close inspection before they can be 

 discerned. The penultimate segment of the pleon is not very 

 broad, and widens a little from the base before narrowing to its 

 distal extremity, so that the shape of the pleon makes some 

 approach to that of CaUincctcs. 



Localit}-: — Two-and-a-half miles off Cape vSt. Elaize. 



Gen.: Ovalipes, Rathbun. 



1825. PlafyouicJius preocc. T.atreille, Enc)cl. Meth Entom., 



vol. 10, p. 151. 

 1853. Anlsopns (preocc.) de Haan, Crustacea Japonica. decas i, 



p. 12. 

 1834. PlafyouicJius, ]\Iilne-Edwards, Hist. Nat. Crust-, vol. i, p. 



435- 

 1838. Ar//rv^M'Leay, Illustrations Zool. South Africa (.Smith), 



[ Invertebrates, p. 62. 



I 1843. Anisopus, Krauss, Die siidafrik. Crustaccen, p. 27. 

 ii8S6. Plaiyonychns, Micrs, Challenger Brachyura, Reports, vol. 

 17, p. 201. 



1897. Xaiza, Rathbun, Proc. Biol. Soc. Washington, vol- 11, p. 



158. 



1898. Ovalipes, Rathbun, Proc- U.S. Mus., vol. 21. p. 597. 

 Platyonichus, Latreille, 1818, as explained by Bell and Miss M. 



J. Rathbun, is a synonym of Porhunnus, Leach, 1813, and is dis- 

 tinct from Platyonichus, Latreille, 1825, which must, therefore, 

 lapse as preoccupied. The same fate befalls .Inisopus, de Haan, 

 the name having been already used in 1803. ATLeay retains de 

 Haan's Anisopus, and beside it establishes a new subgenus Xaiva, 

 not easily distinguishable from it, so that the latter name seemed 

 available for the species previously known as Platyonichus 

 ociUaius fllerbst) and its allies. These allies, in the Challenger 

 Brachj'ura by Mier.s, are named " Plaiyonyc/ms bipiisfii- 

 lafus, ]\Iilne -Edwards, and /'*. in'descens, n. sp." In 

 i8g8 Miss Rathbun withdrew the suggestion that 

 Xavia could be used as their generic name, and 

 writes : — " It has since been brought to my attention 

 that the type of Xaiva, X. pulchclla, ]\IacLeay, is more nearly re- 

 lated to Portnmmis than it is to the species occllatus and hipns- 

 tnlatus" Eor these last, therefore, I am obliged to propose a new 

 name. Ozalipcs differs from Portumnus and Xaii'a in having the 



