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742. Synalpheus Pescadoretisis Cout. 



Synalpheus Pescadorensis H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 877, 

 PI. LXXIII, fig. 15. 



Stat. 96. June 27. South-east side of Pearl-bank, Sulu-archipelago. 15 m. Lithothamnion- 



bottom. 1 male and 1 ova-bearing female. 

 Stat. 282. January 15/17. S°25'.2S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- 



point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 specimen. 



The female from Stat. 96 is almost 1 1 mm. long, the ova are not numerous, small, 0,58 — 

 0,62 mm. long. Rostrum and frontal spines setose at their tips, the rostrum very slightly longer 

 (in Coutière's specimens shorter) than the frontal spines and measuring a little more than one- 

 third the length of the visible part of basal antennular article ; outer margin of frontal spines 

 slightly concave. Median antennular article slightly more than half as long as the visible part 

 of the first, third article as long as the second. Stylocerite acuminate, just as long as the 

 first article. 



The carpocerite extends almost by the length of third article beyond the tip of the 

 antennular peduncle, the lower spine of the basicerite reaches almost to the middle of the 

 second article; the terminal spine of the scaphocerite is as long as the antennular peduncle, 

 while the scale reaches to the 2 nd third part of the distal article (in Coutière's specimens only 

 to the middle of the second) ; upper spine of basicerite as large as in the type. 



The telson which is 3,55-times as long as the posterior margin is wide, accords with 

 Coutière's figure, but the median lobe of the posterior margin is less prominent ; the internal 

 spinules, that are 0,29 mm. long, are but a little shorter than the posterior margin is broad 

 and the width of the latter is just one- third the width at the base. The spinules of the anterior 

 pair, long 0,23 mm., are placed far before the middle, the proportion between the length of 

 the telson and the distance of these spinules from the posterior margin being 1,6; the proportion 

 between the distances of both pairs from the posterior margin is 1,92 and the spinules of the 

 posterior pair are 0,28 mm. long, longer than those of the anterior, as in Coutière's figure 15 e/. 

 The outer angles of the posterior margin of the sixth abdominal somite are acute or spiniform. 



Merus of large cheliped of the female 2,36-times longer than wide, upper margin unarmed, 

 infero-internal margin with an acute tooth at the apex. The large chela shows the following 

 relative dimensions: fingers 1; total length 4; height 1,56; the obtuse tubercle at the anterior 

 border of the palm carries a small acute spinule and at the outer side of this tubercle there is 

 still another smaller one that is obtuse. 



Merus of seconcl legs 5,4-times longer than wide. The first carpal segment, 3,31-times 

 longer than thick, is a little shorter than the sum of the four following and the chela, the 

 fingers of which are one and a half as long as the palm, appears hardly longer than the first 

 segment. The relative dimensions of the third legs are: merus 2,72; carpus i; propodus 1,85; 

 the merus is 3,8-times longer than wide, according to Coutière only a little more than 3-times 

 and the propodus which bears 9 short spinules, long 0,095 mm., 4,72-times. Taken from the 

 proximal extremity of the anterior margin to the tip of the ventral hook, the dactylus measures 

 just one-sixth the propodus; the dactylus, twice as long as wide at its base, accords with the 



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