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Arm of cheliped of d' short M. dentipes (Heller) ^) 



Lobules of orbital portion small (lo — 12 in number), 



gradually decreasing- in size. Arm of cheliped of cT 



long, largely projecting beyond carapace . . . M. distincfa H. Milne-Edwards ') 

 6. Palm of the chela of the cf longer than high, large 



conical tooth of movable finger placed in the middle 



of the cutting margin. Meropodites of walking legs 



with several spines along upper margin. Meropo- 

 dites of penultimate pair of legs in cf 3Y2 times, 



in 9 -V" times as long as broad A/, elegans de Man-*) 



Palm of the chela of the cf as long as high, 



quadrangular tooth of movable finger placed near 



articulation. Meropodites of walking legs with only 



one subdistal tooth at upper margin M. mten)iedia de Man *) 



Helice de Haan. 

 1835. Helice de Haan. Fauna Japon., Crust., p. 28. 



The genus Helice is certainly closely related to ALetaplax, but the cephalothora.x in the 

 former genus is more conve.x, thicker; the chelae are stouter and the horizontal length of the 

 palm is surpassed by its height ; the meropodites of the walking legs, moreover, never carry 

 a series of teeth along their upper margin, as is so frequently observed in Metaplax. The 

 general appearance of the latter genus with its long eye-stalks, its rather narrow front, the 

 anterior margin of which is not rounded, its regularly tapering abdomen, that is not broadened 

 at the third segment, and its carapace usually narrowing backward is sufficiently different from 

 that of Helice. 



There is, on the other hand, still a great deal of confusion in the conception of the 

 genera Helice, Chasmagnatlms and Paragrapsus. Ortmann ') is inclined to unite the two first 

 named genera, and Kingsley '') declares Paragrapsus to be completely identical with CJias- 



1) Helice licnlipes Heller, Reise "Novara", Crust., 1865, p. 62, pi. 5, f. 5 ; Metaplax d. de Man, Jouid. IJmi. Soc. London, 

 V. 22, p. 162, pi. II, f. 1—3; Alcock, Journ. As. Soc. Bengal, v. 69, pvt 2, 1900, p. 433; de Man, Rec. Ind. Mus., v. 2, prt 3, 1908, 

 p. 219; Rathbun, K. Dansk. Vid. Selsk. Skr. 7. Raekke, Afd. 5, n» 4, 1910, p. 329. Hab. Ceylon, Mergui Archipelago and several 

 localities on the continent of British India, also in the Gulf of Siam. 



2) Ann. Sc. Nat. (3) t. 18, 1852, p. 162, pi. 4, f. 27; DE Man, Journ. Linn. Soc. London, v. 22, 1888, p. 158. pi. 10, f. 7 — 9: 

 Henderson, Transact. Linn. Soc. London (2) v. 5, 1893, p. 391; M. distincta Alcock, Journ. As. Soc. Bengal, v. 69, prt 2, 1900, p. 432; 

 M. distincius Nobili, Boll. Mus. Torino, t. 18, n» 452, 1903, p. 23. Hab. Bombay, Madras, Pondichery, Coconada, Nicobars and Mergui 

 Archipelago. 



3) Journ. Linn. Soc. London, v. 22, 1888, p. 164, pi. II, f. 4—6; M. crassipcs (= 9) de Man, Weisek's Zool. Erg. Reise 

 niederl. Ost-Indien, Bd 2, 1892, p. 325, pi. 19, f. 12; M. elegans de Man, Zool. Jahrb., Syst., Bd 8, p. 596, pi. 14, f. 14 (abdomen); 

 Ai-COCK, Journ. As. Soc. Bengal, v. 69, prt 2, 1900, p. 434; Nobili, Boll. Mus. Torino, t. 18, n» 447, 1903, p. 28; R.ATHimN, K. Dansk. 

 Vid. Selsk. Skr,, 7. Raekke, Afd. 5, n" 4, 1910, p. 329. Hab. Mergui Archipelago, Godavari Delta (British India), Pcnang, Malacca, 

 .i^tjeh, Pontianak, Samarinda, Macassar. 



4) Journ. Linn. Soc. London, v. 22, 1888, p. 166, pi. ii, f. 7—9; M. intcnncdia Alcock, Jouin. As. Soc. Bengal, v. 69, prt 2, 

 1900, p. 435. Hab. Mergui Archipelago, and Deltas of Godavari and Ganges. 



5) Zool. Jahrb., Syst., Bd 7, 1894, p. 727. 



6) Proc. Ac. Nat. Sc. Philadelphia, 1880, p. 221. 



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