156 ZOOLOGISCHE MEDEDEELINGEN — DEEL I. 



23. Immovable finger of male cheliped without a larger tooth before the 



middle of its length, but only denticulated along the cutting margin, mov- 

 able finger with a large quadrangular tooth near the base. M. depressus. 

 Immovable finger of male cheliped with a large tooth before or at 

 the middle of its length. 24. 



24. Tooth at the movable finger of male cheliped small or absent, inner 

 surface of palm clothed with hairs. M. definitus. 



Tooth at the movable finger of male cheliped large and conspicuous, 

 inner surface of palm naked. M. japonicus. 



M. pectinipes Guérin. 



1839. M. pectinipes Guérin. Voy. „Favorite", t. 5, 2 me part., p. 169. pi. 49 



(Bombay). 

 1839- „ pectinipes Guérin. Mag. Zool., t. 8, Crust., Cl. 7. pi. 23 (Bombay). 

 1839. „ simplicipes Guérin. Voy. „Favorite", t. 5, 2 me part., p. 171.pl. 50 



f. 1 (Bombay). 

 1839. „ simplicipes Guérin. Mag. Zool., t. 8, Crust., Cl. 7. pi. 24 f. 1 



(Bombay). 

 1852. „ pectinipes H. Milne-Edwards. Ann. Sc. nat., sér. 3, Zool., t. 18 p. 158 



(no new record). 

 1852. „ Guérini H. Milne-Edwards. Ann. Sc. nat. sér. 3, Zool., t. 18 p. 158 



(East-Indies). 

 1852. „ semplicipes H. Milne-Edwards. Ann. Sc. nat., sér. 3, Zool., t. 18 



p. 158 (no new record). 

 1893. „ pectinipes Henderson. Transact. Linn. Soc. London, ser. 2, v. 5 



p. 389 (Sind and Penang). 

 1897. „ pectinipes Ortmann. Zool. Jahrb. Abt. Syst., Bnd. 10 p. 340 (no 



new record). 

 1900. „ pectinipes Alcock. Journ. As. Soc. Bengal, v. 69, part. 2. p. 377 



(Karachi and Orissa). 



This easily recognizable species is best described by Alcock. Except by 

 the comparatively large size this species may attain (Alcock mentions a 

 specimen with a breadth of carapace of 62 mm.), it is distinguished by 

 the „musical crest" in the middle of the anterior margin of the arm of the 

 male chelipeds, by the inferior border of the orbital groove in the male 

 sex being modified in the outer half into four prominent widely separated 

 tubercles ! ), by the large spiniform granules on the carapace, especially 

 on the branchial regions, and by the hinder border of the propodite 

 of the penultimate pair of legs being provided with large, curved spines. 



1) According to Alcock the lower border is „unevenly crenulate". 



