South African Crustacea. 261 



TRIBK GALATHEIDEA. 



FAMILY PORCELLANID^. 

 (For the tribe aud family see tliese Annals, vol. 6, p. 360, 1910.) 



GEN. PETKOLISTHES, Stimpson. 



1858. Petrolisthes, Stimpson, Pr. Ac. Philad., vol. 10, pp. 227 (65), 



241 (79). 

 1888. Henderson, Rep. Voy. Challenger, vol. 27, p. 104 



(with synonymy). 



1907. Stimpson, Smithsou, Misc. Coll., vol. 49, p. 181. 



1910. Rathbuu, Pr. U.S. Mus., vol. 38, pp. 558, 599, 616. 



1918. Rathbuu, Bull. 103, U.S. Nat. Mus., p. 134 



(fossil). 



Stimpson in 1858 gives a list of thirty-four (five of them 

 doubtful) species as belonging to this genus ; in his posthumous 

 essay he is contented with twenty-five. 



PETROLISTHES POLITUS (Gray). 



1831. Porcellana polita, Gray, Zool. Miscellany, No. 1, p. 14. 



1833. ,, ,, Gray, in Griffith's Animal Kingdom, vol. 13, 



Crust., p. 312, pi. 25, fig. 2. (Porcellaria 

 by error on plate and in index.) 



1837. Milne Edwards, Hist. Nat. Crust., vol. 2, 



p. 253. 



1847. White, Crust, in Brit. Mus., p. 63. 



1858. Petrolisthes politus, Stimpson, Pr. Ac. Philad., vol. 10, p. 227 



(65). 



The description in Griffith's Crustacea is brief : " Purplish- 

 brown, much polished, aud punctulate ; the carpus above is 

 flat ; the front edge has three long serrated teeth ; the hinder 

 edge has a spiny ridge near the end ; the forehead is triangular, 

 produced, with the margin rather concave." The figure, though 

 rude, shows closer agreement with our specimen than might 

 be expected from the description. In the chelipeds the teeth 

 on the front or inner edge of the carpus are not serrated, and 

 on the hinder or outer edge the spiny ridge of the eight denticles 

 runs all along, though it becomes more conspicuous distally ; 

 the figure also faithfully shows the teeth on the transverse distal 

 margin of the carpus, which are not mentioned in the description. 



