309 



ó a Dactylus of 3 rd and following legs biunguiculate. 



c l Merus of 3 rd legs in the male 8-times, in the female 6,6-times as 

 long as wide. Inner margin of the merus of larger cheliped with 

 8 or 9 spinules posterior to the spine at distal extremity. Fourth 

 carpal article of 2 nd legs shorter than 2 nd and also than 5 th . 

 Fingers of the smaller chela a little shorter than the palm. Larger 

 chela nearly as in A. Hailstonei Cout. . . . Haüstonei Cout. var. laetabilis de Man 



c„ Merus of 3 rd legs 3-times as long as wide. Fourth carpal article 

 of 2 ud legs somewhat less than half as long as 2 nd and also 

 shorter than the 5 th . Fingers of the smaller chela shorter than 

 the palm. Larger chela with the palm ovoid, the immobile finger 

 truncate and the dactylus falcate ; lower margin crenulate. . . Seurati Cout. 

 (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 881, PI. LXXV, fig. 20). 



a 3 Merus of 3 rd legs with a spiniform tooth at distal extremity. Fourth carpal 



article of 2 nd legs half as long as the 2 nd and shorter than the 5 th 



(also in A. Malhaensis?). 



b x Dactylus of 3 rd and following legs simple. Fingers of the smaller 



chela hardly more than half as long as the palm, the latter one 



and a half as long as high deuteropus Hilgd. 



(F. HlLGENDORF, in: Monatsb. Berl. Akad. Wiss. 1878, p. S34, Taf. IV, Fig. 8). 



ó z Dactylus of 3 vd and following legs biunguiculate (also in A. Malhaensis ?). 

 c 1 Merus of 3 rd legs less than 4-times as long as wide. 



d, Immobile fineer of the lar^e chela not truncate. Finkers of the 

 smaller chela of the male as long or slightly longer than the 



palm, which is 1, 4-times as long as high colhtmianus Stimps. 



d 2 Larger chela as in A. Seurati, but the lower margin smooth, the 

 constriction between the palm and the immobile finger deeper 

 and the extremity of the dactylus less massive. Measurements 



of 3 rd legs: merus 1,9, carpus 1, propodus 1,25 Malhaensis Cout. 1 ] 



(H. COUTIÈRE, in: Buil. Soc. Philom. Paris 1908, p. 15). 



c 2 Merus of 3 ld legs about 6-times as long as wide. Fingers of the 

 smaller chela slightly longer than the palm, which is twice as 

 long as high and armed with two acute teeth at the anterior 

 margin. Larger chela 3-times as long as high. Carpus of 3 rd legs 

 with 3 movable spinules paradentipes Cout. 



The position of an unnamed species, described by Couttère (in : Alpheidae Malei, and 

 Laccad. Archip. 1905, p. 882, PI. LXXIV, fig. 19), is doubtful and therefore this species is 

 not included in the key of this group. 



1) This species is rather incompletely known. In the short diagnosis nothing is said about the merus of the larger cheliped 

 about the smaller cheliped, the three last carpal articles of 2 nd legs and about the dactyli of the three posterior legs. 



177 



SIBOGA EXPEDITIE XXXIX ö'. 40 



