io6 



lo. Anterior part of carapace strongly granulate, front little 

 deflexed, anterior margin straight; postfrontal lobes 

 four. Meropodites of walking legs with subrectangular 

 prominence near distal end of anterior margin; hind 



margin of propodites and dactyli subspinulose . . . B. octodentatus (H. Milne-Edw.) ^) 

 Anterior part of carapace finely granulate; front strongly 

 deflexed, anterior margin nearly straight; postfrontal 

 lobes two. Meropodites of walking legs with acute 

 spine near distal end of anterior margin . . . . B. spinosns (H. Milne-Edwards) ") 



Acmaeopleura Stimpson. 



1858. Acmaeopleura Stimpson. Proc. Ac. Nat. Sc. Philadelphia, 1858, p. 105. 



This genus is very little known ; the carapace is subcircular, unarmed at the margins 

 and resembling that of Cyc/ograpsus^ but the external maxillipeds are widely different, merus 

 and ischium being subequal in length, and broader than long. Two very 

 minute species, the carapaces of which attain only a length of a few millimetres, belong to 

 this genus. 



Key to the species : 

 Carapace widest near the antero-lateral angles; suborbital crest 3- 



or 4-lobed. Chelipeds smooth externally, hands with some strong 



granules at the inner surface, and the gap between the fingers 



filled with hairs externally A. parvula Stimpson ^) 



Carapace widest at the middle. Chelipeds granulate A. rotunda Rathbun ') 



Eriocheir de Haan. 



1S35. Eriocheir (part.) de Haan. Faun. Japon., Crust, p. 32. 



1853. Eriochirus H. Milne-Edwards. Ann. Sc. Nat. (3) t. 20, p. 176. 



This genus much resembles Brachynotus, but the breadth of the front is only one-third 

 of the maximum width of the carapace, there are usually three teeth behind the external orbital 

 angle, and the front is usually strongly 4-lobed. The genus only inhabits Japan and China. 



Key to the species: 

 I. Anterior margin of front 4-lobed; surface of carapace uneven. 



Chelae thickly clothed with hairs 2 



1) Cych^rapsHS oclodentatus H. Milne-Edwards, Hist. nat. Crust., t. 2, 1837, p. So: Heterograpsus o. H. Milne-Edwards, Ann. 

 Sc. Nat., (3) t. 20, 1853, p. 194; Grapsus hwnm/us Hess, Arch. Naturgesch., Jahrg. 31, i, p. 148, pi. 6, f. u (f. DE Man, Zool. Jalirb., 

 Syst., Bd 2, 1887, p. 699); Hcterograpsus 0. Kingsley, Proc. Ac. Nat. Sc. Philadelphia, i88o, p. 209; Haswell, Cat. Austral. Crust., 

 I8S>2, p. loi; Gr«psHs inornalus Haswell, Ibid., p. 98. Hab. Tasmania, King Island, Sydney. 



2) Hettrograpsiis spi„o,us H. Milne-Edwards, Ann. Sc. Xat. (3) t. 20, 1853, p. 194; A.Milne-Edwards, Journ. Mus. Godefiroy, 

 t. 3, 1874, p. 82; Kingsley, Proc. Ac. Nat. Sc. Philadelphia, 1880, p. 210; de Man, Notes Leiden Mus., v. 13, iSgi, p. 56, pi. 4. 1". 15; 

 Ortmann, Zool. Jahrb., Syst., Bd. 7, 1894, p. 715. Hab. Vanikoro Island, Upolu and East Australia. 



3) Proc. .-Vc. Nat. Sc. Philadelphia, 1858, p. 105; Smith.son. Inst.,^liscell. Coll., v. 49, 1917, p. 130, pi. ii'f. 4. Hab. Ousima (lap.m). 



>_. , ^ ,f^ ^™'' '''°'" ^°"'' '^^'='^'''»R'°"- -"■ ", 1909, p. log: K. Dansk. Vid. Selsk. Skr., 7. Raekke, Afd. s, n" 4, igio. p. 327, tCNtf. 10. 

 Hab. Omf of Siam. 



106 



