237 



and the proportion between the distances of both pairs from the posterior margin is much 

 the same as in Syii. streptodactylus, whereas in Syn. Pococki the two pairs are placed 

 closer together. 



The external maxillipeds project with half their terminal joint beyond the tip of the 

 carpocerite. 



Merus of large cheliped twice as long as broad, with a small spine at the apex of the 

 upper margin ; the chela resembles that of Syn. Pococki and one observes a curved spine at 

 the anterior margin of the palm. Merus of small cheliped 2,46-times as long as broad, also with 

 a spinule at the apex of the upper margin. Relative dimensions of the small chela : fingers i ; 

 total length 2,54 — 2,72; height 0,76 — 0,8. 



In the female, long 12,5 mm., from Stat. 282 the first carpal segment of the second legs 

 is 5,75-times as long as thick and distinctly longer than the sum of the following; in the female, 

 long 12 mm., from Stat. 310, in which the eggs present a large size, that proportion between 

 length and thickness of the first segment is 4,4 and this segment appears here a little shorter 

 than the sum of the following. Intermediate proportions 5, 5,6 and 5,65 were, however, also 

 met with respectively in the ova-bearing specimens taken at the Stations 310, 2S5 and 116, so 

 that we maj- conclude that these numbers are rather variable. 



The same variability with regard to the dimensions and their proportions was observed 

 in the following legs, as is proved by the Tables C and D. Sometimes the merus and the 

 propodus of the third and fourth legs are of equal length, in other specimens the merus appears 

 longer than the propodus or shorter than it, and the proportion between the length of these 

 joints and that of the carpus is also quite variable. As regards the proportion between the 

 length and the width of the joints (Table D) a similar variability is observed, but here also all 

 intermediate proportions occur. The merus of the third legs, which bears one or two spinules, 

 long 0,07 — 0,1 mm., is 3,5 — 4,14-times (rarely, N" 4, 3,23-times) as long as wide, the propodus 

 5 — 6,75-times, but the intermediate proportion 6 also often occurs; the propodus is armed 

 with 7 — 10 spinules which are 0,1 — 0,18 mm., rarely 0,08 mm., long, besides those 

 at the distal extremity. Different from Syn. Pococki the propodi are in this species nearly 

 straight, not conspicuously curved as in that species. The dactyli, measured from the proximal 

 end of the anterior margin to the extremity of the ventral hook, usually appear to be o n e- 

 third or a little more than one-third of the propodus, sometimes, as in the female N" 4, 

 two-fifths, or rarely, as in the female N" 10 of Table D, they are slightly shorter than one- 

 third. As in Syn. Pococki the dactyli are sickle-shaped, but they are more slender, 

 3 — 3,5-times as long as broad at their base, rarely, as in the female N" 10, less than 3-times. 

 Ventral or principal hook usually shorter than in Syn. Pococki., measuring Yu — Vn of the 

 total length of the dactylus, and a little broader at its base than it is long ; dorsal hook a 

 little longer, reaching for a short distance beyond the other. The lower or posterior margin 

 of the dactylus appears regularly concave without an)- prominence and, examined under the 

 microscope, appears to thicken gradually until to the distal sixth part of the joint and it then 

 again narrows towards the tip of the ventral hook ; in that thickened part of the margin fine 

 oblique striae are observed; the anterior margin is also slightly thickened, though in a much 



105 



SIBOr.A-EXPEDITIE XXXIX a '. TI 



