ii7 



Arm of cheliped of <? short 



Lobules of orbital portion small (10 — 12 in number), 

 gradually decreasing jn size. Arm of cheliped of e? 

 long, largely projecting beyond carapace . 

 6. Palm of the chela of the <ƒ longer than high, large 

 conical tooth of movable finger placed in the middle 

 ot the cutting margin. Meropodites of walking legs 

 with several spines along upper margin. Meropo- 

 dites of penultimate pair of legs in cf 3 1 /., times, 

 in 9 2 1 /- 1 times as long as broad 



Palm of the chela of the cf as long- as hisfh, 

 quadrangular tooth of movable finger placed near 

 articulation. Meropodites of walking legs with only 

 one subdistal tooth at upper margin 



M. dentipes (Heller) 1 ) 



M. distincta H. Milne-Edwards 



M. elegans de Man 3 ) 



AI. intcrmcdia de Man 4 ) 



Helice de Haan. 

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



The genus Helice is certainly closely related to Metaplax, but the cephalothorax in the 

 former genus is more convex, 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 rat her 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, Chasmagnathus and P-ar agrap sus. Ortmann 5 ) is inclined to unite the two first 

 named 'genera, and Kingsley 6 ) declares Paragrapsus to be completely identical with Chas- 



i) Helice dentipes Heller, Reise "Novara", Crust., 1865, p. 62, pi. 5, f. 5 ; Metaplax •/. de Man, Jouvd. Linn. Soc. London, 

 v. 22, p. 162, pi. 11, f. 1—3; Alcock, Journ. As. Soc. Bengal, v. 69, pit 2. 1900, p. 433; de Man, Ree. Ind. Mus., v. 2, prt 3, 1908, 

 p. 219: RathbüN, 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, Jouvn. Linn. Soc. London, v. 22, 1888, p. 158, pi. 10, f. 7 — 9; 

 Henderson, Transact. Linn. Soc. London (2) v. 5, 1S93, p. 391; .'/. distincta Alcock, Journ. As. Soc. Bengal, v. 69, prt 2, 1900. p. 432: 

 Af. distinctus Nobili, Boll. Mus. Torino, t. 18, n° 452, 1903, p. 23. Hab. Bombay, Madras, Pondichéry, Coconada, Nicobars and Mergui 

 Archipelago. 



3) Journ. Linn. Soc. London, v. 22, iSSS, p. 164, pi. II, f. 4 — 6; M. crassipes (= 9) de Man i Weber'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): 

 Alcock, Journ. As. Soc. Bengal, v. 69, prt 2, 1900, p. 434; Nobili, Boll. Mus. Torino, t. 18, n° 447, 1903, p. 2S; RATHBUN, K. Dansk. 

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

 Atjeh, I'ontianak, Samarinda, Macossar. 



4) Journ. Linn. Soc. London, v. 22, 1S8S, p. 166, pi. II, f. 7 — 9; Af. intcrmcdia Alcock, Jouin. As. Soc. Bengal, v. 69, prt 2, 

 1900, p. 435. Hal). Mergui Archipelago, aud Deltas of Godavari and Ganges. 



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



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



