23 



Of both chelipeds of the male (Fig. i ie) the ischium bears on the dorsal border two obtuse 

 prominences, one contiguous to the merus, the other, half as large, on the middle; on each 

 prominence a spine is implanted, the spine of the distal prominence is one-fourth longer than 

 the other. Besides these two spiniferous prominences, that are also found in Ar. Ipliianassa 

 (J. G. de Man, 1. c. fig. n«, 1 1 ó), the ischium of both chelipeds is armed on the opposite 

 lower side with a large, subacute, probably compressed tooth, of the same size 

 as the distal prominence of the upper border ; unfortunately the ischium of the type specimens 

 has not been described and on the figures i ia, i ló the tooth is not visible, so that I cannot 

 say whether it occurs also in the typical Ar. Iphianassa. Merus and carpus like in the type 

 species, but the crest by which the hollowed lower surface of the carpus is bounded at the inner side 

 is quite unarmed, not ending into an acute tooth. The large chela (Fig. ii£, n/) 

 of the male resembles that of the type, but the denticulation of the fingers is somewhat different. 

 The single tooth of the dactylus is rudimentary, only rèpresented by a very low, 

 rounded prominence, and between it and the articulation there are still 2 or 3 very small, 

 subacute, microscopical teeth ; the large tooth on the middle of the immobile finger is not 

 directed obliquely forward, but truncate and the free edge a little excavate; 

 it is separated by a semicircular emargination from the much smaller, proximal tooth that is 

 also truncate and this tooth is separated by a much lower and smaller notch from the smooth 

 sharp edge that extends between this notch and the articulation. The other chela of the male 

 resembles also that of the type (Fig. 1 1 b), but one observes nearly on the middle of the 

 cutting-edge of the dactylus a very small obtuse tooth and between it and the articulation 6 

 or 7 much smaller, microscopical though sharp teeth. 



The chelae of the female are very nearly equal and apparently do not differ from 

 those of the type. 



The following legs of the male proved to be a little more si en der than in the 

 type. Merus of the 2 nd pair 0,9 mm. long, 4,2-times as long as wide in the middle. Carpus 

 1,1 mm. long, the four segments from the i st to the last 0,55 mm., 0,15 mm., 0,13 mm., 

 0,27 mm.; the i st segment 3,6-times as long as thick at the distal extremity; the 4 th segment 

 being 0,16 mm. broad near the articulation with the chela, the carpus proves to be 7-times 

 as long as wide at its distal extremity. Chela 0,61 mm. long (palm 0,32 mm., fingers 0,29 mm.). 



Merus ot the 3 rd pair 1,3 mm. long, 0,28 mm. wide in the middle, proportion 4,6; 

 carpus 0,72 mm. long, 0,22 mm. thick at the distal extremity, proportion 3,3; propodus 1,25 

 mm. long, 0,18 mm. broad in the middle, proportion 7, with 11 short spinules along its whole 

 length besides the 2 longer ones at the distal extremity; dactylus 0,34 mm. long, 0,094 mm. 

 broad at base, proportion 3,7. Relative measurements : Merus i,8, carpus 1, propodus 1,74; 

 merus 1,04-times as long as the propodus, dactylus a little more than l j i of the propodus. 

 Tooth on the merus as in the type. 



Merus of the 4 th pair 1,05 mm. long, 0,26 mm. broad in the middle, proportion 4; 

 carpus long 0,64 mm., 0,21 mm. thick at the distal extremity, proportion 3; propodus 1,22 

 mm. long, 0,17 mm. broad in the middle, proportion 7,2, with 7 or 8 spinules along the 

 posterior margin besides the two at the distal extremity; dactylus 0,34 mm. long, a little more 



