278 



at the apex of the upper margin ; there is also an acute tooth at the apex of the infero- 

 external margin. The measurements of the large chela, taken along the infero-external side, 

 are: fingers i; total length 3,3; height 1,2, this chela being 2,75-times longer than high. 

 Characteristic of this species are two conical, though rather obtuse tubercles, 

 placed abreast at the anterior margin of the palm and directed obliquely forward and upward; 

 they are nearly of the same size, the outer usually a little smaller than the other. The large 

 chela of an ova-bearing female from the same station and about of the same size as the male, 

 shows the following proportions: fingers i; total length 3,75; height 1,5, the chela being just 

 2,5-times longer than high. In an egg-bearing female from Stat. 315 these numbers are : fingers i ; 

 total length 4; height 1,6. The two tubercles on the anterior margin of the palm are just as 

 well developed as in the male. 



In the male from Stat. 273 the large chela is 2,7-times longer than the other and the 

 relative dimensions of the small chela are : fingers i ; total length 3 ; height i . Merus of small 

 cheliped 3,6-times longer than wide. In the small chela of the adult female, long 21,5 mm., 

 from Stat. 164 the fingers are a little longer, the proportions being: fingers i ; total length 2,9; 

 height I . The merus is unarmed at the apex of the upper margin and the palm bears no 

 tubercles near the articulation of the dactylus. 



Merus of second legs 4,45-5-times longer than wide. First carpal segment rather stout, 

 shorter than the sum of the following and from the measurements in Table B it seems to result 

 that the difference diminishes the larger the specimens are. The second, the third and the fourth 

 segment are of equal size. Chela slightly longer than the first segment, but shorter than the 

 sum of the following, fingers in proportion to the palm as 4:3. 



The relative dimensions of the third legs and the proportion between the length of the 

 merus and that of the propodus are indicated in the Table C. Merus 3,3 — 3,6-times longer 

 than wide; in the typical male from Stat. 273 it bears five spinules on the distal half of the 

 posterior margin, which are 0,12 — 0,17 mm. long, and the propodus is armed with eight spinules, 

 long 0,15 mm.; in the adult female, long 21,5 mm., from Stat. 164 the merus is armed with 

 seven spinules, long 0,15 — 0,22 mm., in the very young specimen from Stat. 184, however, 

 there are only two spinules, long 0,036 and 0,055 mm., on the merus and seven spinules on 

 the propodus. Dactylus one-sixth of the propodus, when measured from the proximal extremity 

 of the anterior margin to the tip of the ventral hook and 2,2-times longer than wide; in the 

 adult female from Stat. 1 64 the dactylus measures hardly one-seventh the length of the propodus 

 and appears twice as long as wide. Dactylus similar to that of Syii. pachynieris^ dorsal hook 

 twice as long and one and a h a 1 f a s wide at its base as the ventral (the width taken 

 from the suture near the base of the ventral hook to the outer margins) ; in young specimens, 

 as e. g. in that from Stat. 78 the dorsal hook appears one and a half as long and but a little 

 broader than the ventral hook ; interval between both hooks wide, rounded at the base. 



In the specimen from Stat. 78 the rostrum appears just as long as the acute, lateral 

 teeth which are directed inward ; in the adult specimens from Stat. 1 64 the three frontal spines 

 are shorter than in the described male, the rostrum reaching about to the 2"<i third part of 

 the visible basal joint, and the lateral spines are still shorter. 



146 



