4^5 



more narrow, subulate rostrum, but with regard to the two others he indicates no other 

 difference than the lobes both on the upper and on the lower border of the palm of the large 

 chela terminating in A. Edzvai'dsii in an acute spine, whereas in A. Atidouiiii they should be 

 obtuse, "en ogive". Of the 4 specimens of A. chiragricus from the Mergui Archipelago that 

 are lying before me, these lobes end in the largest female in a spine, but in the three other 

 specimens they are more or less obtuse. This character appears therefore to be of doubtful 

 value. In the three larger chelae present in the "Siboga" specimens these lobes show the form 

 characteristic of A. Audo7uni and therefore these specimens are referred to this species. One 

 of the egg-bearing females from Amboina is 28 mm. long. The acute rostrum, nearly as broad 

 at its base as it is long, reaches almost to the end of first antennular article and projects 

 horizontally forward; it is continued in a broad, low and rounded ridge, that is separated by 

 shallow grooves from the orbital hoods. A rounded prominence at either side of the rostrum 

 is very small, so that the frontal margin appears nearly straight. Antennal and antennular 

 peduncles with scaphocerite and stylocerite as in A. Edzvardsii (Coutiere, 1. c. fig. 50). The 

 large chela agrees with Coutiere's figure 52a, but the height of the fingers is a little 

 smaller in proportion to the height of the palm: the chela, indeed, is 12,5 mm. 

 long, the palm 8 mm. long and 5,5 mm. high, the fingers 3,6 mm. high. The chela presents 

 therefore a different shape from that of A. cJiiragricus and more resembles that of A. bis-incisus 

 var. variabilis , which variety, however, at first sight differs by the more prominent and narrower 

 rostral carina. The small chela of this female nearly agrees with that of the variety variabilis 

 of A. dis-ijicisiis. Proportion between the length of the first and of the second carpal segments 

 in this female 1,8, according to Coutiere it should be 1,65. The following legs as in ^. c/«2>a^rzVz/.y. 



New researches based on complete and well-preserved specimens are necessary to decide 

 the question whether this pretended species, A. Atidoziini^ is really different from the Egyptian 

 A. Edwardsii Aud. 



General distribution: From the Red Sea to New Zealand and the Hawaiian 

 Islands (Coutiere). 



56. Alpheus chiragricus H. M.-Edw. 



Alpheus chiragricus H. Milne-Edwards, Hist. Nat. Crustaces, II, 1837, p. 354. 



Alpheus chiragricus H. Coutiere, Alpheidae Maid, and Laccad. Archip. 1905, passim in texto, 



p. 912, PL LXXXVI, fig. 51. 

 Alpheus Edzvardsii J. G. de Man, in: Journal Linnean Soc. London, XXII, 188S, p. 266 and 



in: Archiv f. Naturg. 53. Jahrg. 1888, p. 516 and in: Zoolog. Jahrb. IX, Abth. f. Syst. 



1897, p. 745 ^^., PI. 36, fig. 6\e and in: Memoires Soc. Zool. France XI, 1S98, p. 312, 



PL IV, fig. I and in: Abhandl. Senckenberg. Naturf. Gesells. XXV, 1902, p. 880—883, 



passim in texto, PL XXVII, fig. 62b and 62 c. 



Stat. 33. March 24/26. Bay of Pidjot, Lombok. 9—22 m. Mud, coral and coralsand. i young male. 

 Stat. 34. March 27. Anchorage off Labuan Pandan, Lombok. Coralreef. 2 specimens, one of 



which with eggs, but in both the legs of ist pair are missing. 

 Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 



I young specimen captured at a depth of 54—90 m. and another which is still 



younger and infested by a Bopyrus, from the reef; in both specimens the legs 



of I St pair are missing. 



283 



