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remote from the lateral margins than in most other species; the anterior pair, that is placed 

 in the female from Stat. 164 just in the middle, in the adult male and in the young specimen 

 from Stat. 154 a little before the middle, in the still younger individual from Banda somewhat 

 more, forms with the posterior pair a regular quadrate; as usually are the posterior 

 spinules a little longer than the anterior. The posterior margin of the telson, the upper surface 

 of which is a litde hairy and distinctly grooved in the middle except near the base, appears in 

 the adult male but little prominent, not reaching beyond the short, acute, outer angles; in the 

 female from Stat. 164 and still more in the young specimen the posterior margin distinctly 

 projects beyond the outer angles. The longer, inner spinules of the posterior margin are halt 

 as long as that margin is wide and are a little longer than the spinules of the upper surface. 



The large cheliped of the female was figured by me in 1888. Both in the large and 

 in the small cheliped of the male the upper margin of the merus terminates in an acute triangular 

 tooth at the apex, the merus of the larger is twice as long as wide, that of the smaller 3- 

 times. Large chela massive, much swollen, supero"internal surface of the immobile finger slightly 

 flattened, not so in the female; the anterior margin of the palm ends in a small, conical, though 

 obtuse tubercle, that is directed straightly forward. The relative dimensions are: fingers i; total 

 lencrth 4,2; height 1,8, the fingei-s being rather short and the proportion between length and 

 height is 2,38. 



Proportion between the length of both chelae 2,7. The relative dimensions of the small 

 chela are: fingers i; total length 2,6; height 0,86, and this chela is just 3-times longer than 

 high. Both the dactylus and the immobile finger are enlarged laterally, presenting nearly 

 the same width along their whole length; the dactylus that carries no brush of 

 hairs, terminates in an acute tooth at the inner side of which one observes another also acute, 

 at the outer side, however, a truncate lobe; the other finger terminates in four acute teeth, 

 viz. two on the inner side and one at the outer side of the principal hook. 



The large chela of the female from Stat. 1 64 shows the same proportion between length 

 and height, but the fingers are still shorter; they measure one-fourth the length of the palm, 

 the relative dimensions being: fingers i; total length 5,11 height 2,2. 



The measurements of the second and third legs are given in the Tables B and C. The 

 second legs appear in the adult specimens more slender than in the young and the fingers are 

 a little shorter than the palm. Merus of third and fourth legs unarmed, devoid of spinules. 

 In the adult male from Amboina the propodus of the third legs, which much resembles the 

 propodus of Syn. pachymeris Cout. and Syn. biiubercnlatiis de Man, is armed with 1 1 spinules, 

 long 0,29 — 0,34 mm., in the young specimen from Stat. 154 with 8, that are 0,18 — 0,2 mm. 

 long; the propodus is rather much setose. The dactylus bears, like the small chela of the first 

 pair, a great resemblance to that of Syn. laticeps Cout. (H. Coutiere, Alpheidae Maid, and 

 Laccad. Archip. 1905, PI. LXXII, Fig. \\c). The dactylus measures somewhat more than one- 

 sixth the length of the propodus, when measured from the proximal extremity of the anterior 

 margin to the tip of the ventral hook and it is 2,3 — 2,5-times longer than wide. The dorsal 

 hook, which is 3-times longer than wide at its base, is one and a half as long as the 

 ventral, which is only twice as long as wide at its base, but the width at their base is nearly 



164 



