f 70. Alpheus edamensis de Man. 



Alpheus Hippotho'è de Man var. edamensis J. G. de Man, in: Archiv f. Naturg. Jahrg. 53, 



1888, p. 518. 

 Alpheus Hippotho'è var. edamensis L. Zehntner, Crustacés de 1'Archipel Malais. Genève 1894, p. 201. 

 '-.Alpheus Hippotho'è var. edamensis H. Lenz, in: Abhandl. Senckenb. Naturf. Ges. XXVII, 

 1905, p. 383. 

 Alpheus acanthomerus A. Ortmann, in: Zoolog. Jahrb. V. Abth. f. Syst. 1890, p. 474, Taf. 

 XXXYI, hg. 12 and in: Semon, Zoolog. Forschungsreisen, V, 1894, p. 13. 

 '1 Alpheus acanthomerus H. Coutière, in: Notes from the Leyden Museum, Vol. XIX, 1897, p. 202. 

 Nee: Alpheus Hippotho'è var. edamensis J. G. de Man, in: Zoolog. Jahrb. IX. Abth. f. Syst. 

 1897, p. 757 and in: Abhandl. Senckenb. Naturf. Ges. XXV, 1902, p. 891. 



Stat. 58. April 25. Anchorage off Seba, Savu. Reef. 1 adult male and 1 adult, egg-bearing 



female. 

 Stat. yy. June 10. 3°27'S., ii7°36'E. Borneo-bank. 59 m. Fine, grey coralsand. 1 adult, 



egg-bearing female. 

 Stat. 78. June 10 11. Lumu-Lumu-shoal, Borneo-bank. Reef. 1 adult male and 1 egg-bearing 



female. 

 Stat. 79'. June 12 13. Pulu Kabala-dua, Borneo-bank. Reef. 1 young specimen. 

 Stat. 86. June 18 19. Anchorage off Dongala, Palos-bay, Celebes. Reef. 1 young female. 

 Stat. 115. July 9 11. East side of Pajunga-island, Kwandang-bay. Reef. 1 adult male. 

 Stat. 133. July 25 2j. Anchorage off Lirung, Salibabu-island. Reef. 1 male. 

 Stat. 181. September 5 11. Ambon-anchorage. Reef. 1 egg-bearing female and 1 young specimen. 



This species, of which both the male and the female attains a length of 37 mm., closely 

 resembles A. Hippotlioë de Man, from which it differs by the measurements of the carpal 

 segments and by the more slender shape of the three posterior legs. Two cotypes of A. Hippotlioë 

 var. edamensis from Pulu Edam or Amboina and the four specimens described by Zehntner (1. c), 

 also from Amboina, received respectively from the Museum at Göttingen and from that of 

 Geneva, are hing before me. 



In one of the cotypes, an ova-bearing female, the carpal segments of the second legs 

 are 2,3 mm., 3 mm., 1 mm., 1,12 mm. and 1,72 mm. long, the chela is 2,86 mm. long (palm 

 1,6 mm., fing"ers 1,26 mm.); in the adult male from Stat. 78 these numbers are respectively: 

 2,9 mm., 3,5 mm., 1,26 mm., 1,36111111. and 2,3 mm., chela 3,6 mm. long (palm 1,84111111., fingers 

 i,/6mm.); in the adult female from Stat. yy these segments are 2,4111111., 3111111,, 1 mm., 1,1 mm. 

 and 2 mm. long, the chela 3,16111111. (palm 1,8 mm., fingers 1,36111111.); in the young specimen 

 from Stat. yg h they measure 1,35111111., 1,16 mm., 0,52111111., 0,52111111. and 1 mm.; the chela 

 is 1,74111111. long (palm 0,9 mm., fingers 0,84 mm.) and in the still younger female from Stat. 86 

 the carpal segments are 0,9 mm., 0,84 mm., 0,32 mm., 0,32 mm. and 0,5 mm. long; the chela 

 is 0,9 mm. long (palm 0,48 mm., fingers 0,42 mm.). These numbers indicate that the first segment 

 measures three-fourths to four-fifths of the second, but that in young specimens the second 

 segment may even be slightly shorter than the first, that the chela appears nearly as long as 

 the second segment, except in the young specimen from Stat. 79'' which is perhaps abnormal, 

 and that the fingers are always shorter than the palm, while in A. Hippotho'è they are 

 always 1 o n g e r than it. 



3°5 



SIBOGA-EXPEDITIE XXXIX a'. 56 



