1000.] FROM THE SOUTH PACIFIC. 575 



Microphrys styx, A. M.-Edwards, Nouv. Arch. Mas. (1) viii. 

 p. 247, pi. xi. fig. 4 (1872). 



Tylocarcinus styx, Miers, Ann. Mag. Nat. Hist. (5) iv. p. 14 

 (1879); Alcock, Journ. As. Soc. Beng. lxiv. 2, p. 235 (1895). 



Eotuma ; eight males and eight females. 



Two of the males have adult chela? as in Milne-Edwards's figure. 

 The length of these two is 20 and 18 mm. respectively, measured 

 from the hinder end of the carapace to the tip of the rostral 

 spines. Of the remaining six males, the two biggest were both 

 exactly 16 mm. long; in one of these the two chelae were both like 

 those of the female and young male, in the other the left claw was 

 that of the female and the right that of the grown male. All the 

 other specimens had the chelae of the female. 



Subfamily Maiin^. 



Genus Cyclax Dana, 1852. 



11. Cyclax (Ctclomaia) suborbicularis (Stimps.), 1857. 



Mithrax suborbicularis, Stirapson, Proc. Ac. Nat. Sci. Philad. 

 1857, p. 218. 



Cydomaia margaritata, A. M.-Edwards, Nouv. Arch. Mus. (1) 

 viii. p. 236, pi. x. figs. 2, 3 (1872). 



Cyclax (Cydomaia) suborbicularis, Alcock, Journ. As. Soc. Beug. 

 lxiv. 2, p. 245 (1895). 



Eotuma ; three males and three females. 



Of the females one, 19 mm. long, had the sterna completely 

 covered by the abdomen. The others, 17 and 18 mm. loog 

 respectively, showed a considerable stretch of the sterna bare on 

 each side of the abdomen. 



Family Hymenosomidj, 



Genus Elamene H. M.-Edw., 1837. 



12. Elamexe truncata A. M.-Edw., 1874. 



Elamene truncata, A. M.-Edwards, Nouv. Arch. Mus. (1) x. 

 p. 323 (1874). 



Roturna ; one female. 



Subtribe CYCLOMETOPA. 



Eamily Atelecyclid^. 



It seems best to follow Ortmann in keeping this family distinct 

 from the Cancridae, and to place in it the subfamilies Atelecyclinae, 

 Acanthocyclinse, and Thiinae. 



38* 



