39i 



is much compressed, its thickness being in proportion to its height as 2:5, bears a trans- 

 verse groove just behind the articulation of the dactylus and appears, posteriorly to this 

 groove, fiattened ; the outer margin ot the upper border is marked with a ridge, the inner is 

 fringed with hairs. The somewhat pubescent, outer surface of the palm is fiattened, that of the 

 immobile finger slightly concave and the outer margin of the lower border, which appears 

 concave at the base of the immobile finger, is rather sharp. Inner face of the palm, especially 

 of the immobile finger, finely granular. 



Merus of the large cheliped of the adult female less broad than that of the male, 3,5-times 

 as long as broad, infero-external margin feebly serrulate, infero-internal with 5 short spinules 

 and, at the apex, with a sharp tooth, like in the male; chela as long as the carapace, comparatively 

 less high than in the male, the proportion between length and height being 3,3; fingers shorter 

 than in the male, the palm 1,5-times as long as the fingers. There is a transverse groove on 

 the upper border, which is less distinctly fiattened. 



Small chela of the male hardly longer than the carapace, much resembling that of 

 A. djeddensis Cout. (Coutière, Les " Alpheidae", Paris, 1899, p. 233, fig. 285)-, the fingers that 

 are Ba/aenüe/>s-shape.d, agree with those of this species, but they are slightly longer than the 

 palm, the upper border of which is fiattened, with a transverse groove near the dactylus and 

 with the outer margin ridged ; this chela is 3,45-times as long as high. Merus of the small 

 cheliped of the female similar to that of the larger, but 4-times as long as broad. Chela a 

 little shorter than the carapace, 5,6-times as long as high, presenting its greatest height at 

 the articulation of the fingers ; fingers o n e and a h a 1 f a s long as the palm, slender, shutting 

 together, their tips crossing one another ; upper border of the palm which is slightly higher than 

 thick, without a transverse groove. In the adult male the carpal segments of the 2 nd legs are 

 1,35 mm., 1,95 mm., 0,8 mm., 0,75 mm. and 0,8 mm. long, the second segment 8-times as long 

 as thick; chela 1,141:1111. long (palm 0,56 mm., fingers 0,58 mm.). In the somewhat younger 

 male from Stat. 60 these segments are 0,9111111., 1,75111111., 0,84 mm., 0,8 mm. and 0,7 mm. 

 long, the second segment 9-times as long as thick; chela 1 mm. long (palm 0,46 mm., fingers 

 0,54 mm.). In the egg-bearing female from Makassar the carpal segments are 1,4 mm., 1,44111111., 

 0,6 mm., 0,6 mm. and 0,6 mm. long, the second 7-times as long as thick;- chela 1,04 mm. 

 long (palm 0,44 mm., fingers 0,6 mm.). In the female from Stat. 77, finally, the segments of 

 the carpus are: 1 mm., 1,54 mm., 0,7 mm., 0,66 mm. and 0,68 mm. long, the second segment 

 7, 7-times as long as thick; chela 1,05111111. long (palm 0,45111111., fingers 0,6 mm.). These 

 numbers prove that the second segment of the slender carpus appears in the male and in the 

 young female one and a half to twice as long as the first, while both segments are nearly of 

 equal length in the adult female (in the egg-bearing female from Stat. 162 the second segment is 

 also but Y u longer than the first), and that the three, slender, last joints are of equal length. 



Ischium of 3 rd ancl 4 th legs with a movable spine. Merus of the 3 rd legs, in the adult 

 male, slender, 5-times as long as broad, unarmed. Carpus half as long as the merus, propodus 

 1,3-times as long as the carpus, straight, slightly narrowing towards the distal extremity, 5-times 

 as long as broad near the carpal articulation ; posterior margin of the propodus with 5 pairs 

 of spinules, both margins beset with long setae, like the anterior border of the carpus. Dactylus 



2 59 



