342 



the distal extremity. Carpus unarmed. Chela one-third longer than the carapace, the rostrum 

 included, somewhat turned outward, almost 3 -times as long as high, decidedly com- 

 pressed and a little more than half as thick as high; the chela is smooth and almost glabrous. 

 The upper border of the palm shows a longitudinal groove, that runs from near the 

 articulation of the dactylus, gradually narrowing, to that of the carpus; the outer margin of 

 this o-roove, i. e. the upper margin of the outer face, is rather prominent, like the inner 

 maro-in, which does not reach to the articulation of the dactylus, and the posterior, very 

 narrow part of this groove runs along the elliptical area. Lower border of the chela rounded, 

 fino-ers measuring two-fifths of the palm, dactylus obtuse, slightly longer than the immobile 

 fino-er. In A. gracilis the upper margin of the merus of the large cheliped ends in an obtuse 

 tooth and the chela is much higher, the palm indeed should be more than half as high 

 as long (confer: J. G. de Man, in: Zoolog. Jahrb. IX, Abth. f. Syst. 1897, p. 733, Taf. 34, 

 Fig. 60 g, 60/1). 



Merus of the small cheliped 3-times as long as broad at the distal end, armed with a 

 curved spine at the far end of the upper margin, but the tooth at the distal extremity of the 

 infero-internal margin is so small, that it may easily be overlooked. The chela is as long as the 

 carapace and turned outward, about 5-times as long as high, slightly compressed; palm as long 

 as the fingers, smooth, rounded, entire. Fingers tapering, shutting together, a little hairy, a 

 few setae also on the distal half of the inner (upper) surface of the palm ; a small acute tooth 

 is observed at the inner (upper) side of the articulation of the dactylus. 



Carpal segments of the (right) second leg 1,4 mm., 0,68 mm., 0,46 mm., 0,44 mm. and 

 0,8 mm. long; chela 1,54 mm. long (palm 0,75 mm., fingers 0,79 mm.). These numbers prove 

 that the first segment is twice as long as the second and that the fifth is slightly longer than 

 the second, whereas in A. gracilis it is shorter than it. The carpus also much resembles that 

 of A. aglaopheniae Borr. 



Ischium of 3'<^ and 4'^^ legs with a movable spine. Merus of 3''^ legs 5-times as long 

 as wide, unarmed; carpus half as long as the merus ; propodus 1,6-times as long as the carpus, 

 7 — S-times as long as wide, posterior margin with 8 spinules. Dactylus hardly one-third of the 

 propodus, 5-times as long as wide at its base in a lateral view, slightly curved, no acces- 

 sory claw on its posterior margin, buth with a minute tooth at the distal third 

 of the anterior; there are two setae at either side of this tooth, recognizable by means of 

 the microscope. Anterior margin of carpus and propodus with a few setae. In A. gracilis the 

 dactylus is biunguiculate, in its variety Alhiatidi Cout. it is simple. 



The two other specimens show some slight differences, all or partly due to their younger 

 age. In the specimen, long 12 mm., from Pajunga Island the rostrum reaches to the 2°'^ third 

 part, in the still younger individual from the Aru-islands, which is only 8 mm. long, even to 

 the middle of the 2^^ joint of the antennular peduncle and in both specimens this joint appears 

 slightly, about one-sixth, longer than the visible part of the first, whereas the third joint is 

 hardly shorter than the second. The movable spine of the outer uropod shows still a pale 

 brown colour, appearing not yet black. The longitudinal groove on the upper border of the 

 palm of the large chela is still little developed and not easily recognizable. The fingers 



