254 



rostrum, a little setose at the tips. The three spines are sometimes directed straightly and hori- 

 zontally forward, sometimes they are slightly upturned at the tips, sometimes the lateral spines 

 are a little directed inward and in the male from Atjeh the three spines are moreover slightly 

 turned downward. 



Visible part of i st antennular article in proportion to the length of the 2 nd as 4:3; 

 2 nd article about one and a half as long as thick at the distal extremity and hardly longer than 

 the 3 rd . The visible part of i st article appears but a little shorter than the 2 nd and the 3 ld 

 taken together. The stylocerite reaches to the middle or to the distal 3 ld part of median article. 

 Lower spine of basicerite nearly as long as the basal part, not longer, reaching to the 

 extremity of i st antennular article or just beyond it; spine at the upper angle well-developed, 

 in the adult specimens distinctly shorter than the lateral frontal spines, but in the young specimen 

 from Atjeh reaching as far forward as these spines. Like in the typical Syu. Bakert, the 

 carpocerite, measured at the lower side, appears 3,6-times as long as wide and surpasses the 

 antennular peduncle only with one-fourth or one-fifth the 3 vd article. While in the typical species 

 the terminal spine of the scaphocerite extends beyond the carpocerite, in the variety Stormt 

 the terminal spine is as long as the carpocerite or sometimes even slightly shorter ; scale 

 reaching to the middle or to the distal third part of 3 rd antennular article. 



Merus of both chelipeds with a spine at the apex of the upper margin, the two other 

 margins unarmed. In the young specimen from Atjeh the measurements of the large chela are : 

 fingers 1 ; total length $,7; height 1,35; proportion between length and height 2,75. The palm 

 terminates in a small, conical tooth. Fingers of the smaller chela a little shorter than the palm. 

 The measurements of the 2 nd legs are indicated in Table B, those of the specimens from 

 Balikpapan generally agree with those of the specimens from Atjeh, while the carpal segments 

 are a little more slender, the older the specimens are; I will, however, remark that in the 

 adult specimens from Balikpapan the chela is not longer, but a little shorter than the sum of 

 the three last carpal segments and that in these individuals the 5 th segment appears a little 

 longer than the palm. 



For the measurements of the 3 rd legs see Table C. They apparently prove that the 

 merus and the propodus are longer in proportion to the palm, the older the specimens are. 

 Whereas in the typical Bakert the merus is 3,5-times as long as wide, in this variety the ratio 

 is as 4 : 1. In the young specimen from Atjeh the propodi bear 5 spinules long 0,17 — 0,19 mm., 

 besides 2 at the distal extremity, in the specimens from the East coast of Borneo, however, 

 7 spinules long 0,27 mm., besides the 2 apical spines. Measured from the proximal extremity 

 of the anterior margin to the end of the principal hook the dactylus proves, in the young 

 specimen from Atjeh, to be 0,5 mm. long, one-fourth the length of the propodus, and to be 

 3-times as long as wide at its base, near the propodal articulation. The principal hook, which 

 is twice as long as thick at its base, makes an obtuse angle with the longitudinal axis of the 

 dactylus and is separated by a semicircular curve from the ventral hook, which runs parallel 

 with the principal ; the ventral hook is very small and measures, as in the typical species, 

 hardly one-fourth the length of the principal. The dorsal hook is as long as the latter, but 

 only half as thick at its base and the notch between both hooks is sharp. 



