438 



In this species the meri of the third legs are four-, but in A. Hippotho'è three-times 

 as lonor as broad in the middle. 



O 



The rostrum always reaches to the end of first antennular article and rarely it extends 

 even just beyond it ; as regards the form of the rostral carina and of the frontal margin at 

 either side of it, this species closely resembles A. Hippothoc. The telson has a different form, 

 its posterior margin appears in A. edauiensis broader in proportion to the length of the 

 telson and to its greatest width anteriorly. In A. cdamensis the posterior margin of the telson 

 measures two-fifths of its length and appears a little broader than half the greatest width ; in 

 A. Hippothoc, however, the posterior margin appears a little less broad than half the greatest 

 width and measures hardly one-third of the length. 



The spine in which terminates the stylocerite is often slightly turned ontward. 



There is a spine at the far end of the infero-internal margin of the meri of both chelipeds, 

 but in the small cheliped it is very small and may easily be overlooked. In the adult male 

 from Stat. 78 the larger chela which is one and a half as long as the carapace without the 

 rostrum, appears a little more than twice as long as high, this chela being 2 1 mm. long and 

 9,5 mm. high; the fingers, 8 mm. long, measure a little more than one-third the length of the 

 chela. The groove on the outer face of the palm is large, quadrangular and occupies 

 two-fifths of the height of the palm, the groove on the inner surface is triangular and 

 extends less far downward. 



Unfortunately no male is still provided with the small cheliped, but it is present in the 

 adult male from Amboina of Zehntner's collection. In this specimen the small chela appears 

 just as long as the carapace without the rostrum, 3-times as long as high and the fingers are 

 somewhat longer than the palm; the latter, a little longer than high, is slightly emarginate 

 distally, both on the upper and on the lower border and there is a tracé of the quadrangular 

 depression on the outer surface. The fingers are very hairy at the inner side and, as in 

 A. euchirus, the dactylus bears a hairy crest at the inner, but not on the outer side; near 

 the articulation of the dactylus the palm is armed with an acute tooth at the inner side and 

 with a smaller one at the outer. 



The small chela of the female resembles that of the male, but it has a somewhat more 

 slender form, especially the fingers, and there is no hairy crest at the inner side of the dactylus. 



Like in A. Hippotlio'c the chelae are adorned, especially on their inner surface, with 

 numerous, small, circular, blue spots, that sometimes occur also on the outer side, though here 

 much less numerous; in other specimens, like in the adult male from Stat. 78, the fingers are 

 hardly spotted at all, but some spots occur on the distal part of the palm. 



Remarks. According to Dr. Ortmann (1. c. 1894, p. 13) A. acant homerus Ortm. from 

 Tahiti is identical with this species. The egg-bearing female from Stat. ~jj closely agrees with 

 the figure 1 2 in Ortmann's description (1. c. 1 890), except the rostrum which in our specimen 

 reaches to the end of first antennular article, whereas it appears much shorter in that figure. 

 This is, however, no doubt an individual difference. 



General distribution: Pulu Edam, Bay of Batavia (de Man); Amboina (de Man, 

 Zehntner); Tahiti (Ortmann). 



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