257 



There is an obtuse tubercle at the distal extremity of the palm-, the im mobile finger bears at 

 the base on the outer side a conical tubercle and a much smaller obtuse tubercle in the middle, 

 and between both tubercles the finger appears distinctly concave, while the inner side of the 

 finger is also excavate or furrowed on its proximal half. In the same specimen from Stat. 66 

 the relative measurements of the small chela are: fingers i; total length 2,7; height 1,1. The 

 large chela is 2,6-times as long as the other, according to Coutière 2,45-times. 



In the specimen from Stat. 66 as also in the ova-bearing female from Stat. 58 the 

 merus of second legs is 5-times as long as wide. In the specimen taken at the Station 66 the 

 first segment is 4,8-times longer than thick and a little longer than the sum of the following. 

 in the female the proportion is 4,4 and the first segment appears as long as the sum of the 

 following. Synalpheus Heroni is mainly characterized by the shape of the three posterior legs 

 and of their dactyli. In the specimen from Stat. 66 the propor'cions of the third pair are: 

 carpus i; merus 1,82; propodus 1,47, those of the fourth pair are: carpus i; merus 1,84; 

 propodus 1,47. Merus of third legs 2,32-times longer than wide, propodus 3,86-times, the latter 

 with 7 strong propodal spinules, 0,2 — 0,22 mm. long, besides those at the clistal extremity. 

 The length of the dactylus, taken from the proximal extremity to that of the principal hook, 

 is almost one-third the length of the propodus; the dactylus is just half as broad at its base 

 as it is long, the principal hook, which is twice as long as thick at its base, is regularly curved 

 downward and makes an acute angle with the dorsal hook which is hardly shorter, but half as 

 thick at its base ; the third, ventral, prominence, finally, is acute and well marked. 



The merus of fourth legs, one-tenth shorter than that of the third, is 2, 5-times longer 

 than wide, the propodus 3,8-times and armed with 6 spinules that are 0,21 mm. long, besides 

 those at the distal extremity; dactylus similar to that of the third legs. These legs are slightly setose. 



Eggs not numerous, 0,7 — 0,75 mm. long. 



In the ova-bearing female from Stat. 58 the fingers of the large chela are of a verdigris 

 colour, the palm yellow. This female is 1 1,5 mm. long, the specimen from Stat. 66 has the same size. 



General distribution: Djibouti (Coutière). 



f 2 1 . Synalpheus Demani Borr. 



Alplieus triunguiculatus J. G. de Man, in: Archiv für Naturg. 53. Jahrg. 1888, p. 504, 



PI. XXII, fig. 1 (Nee PAULSON). 

 Synalpheus demani L. A. Borradaile, in : A. Willey's Zoological Results. Part IV. Cambridge 



University Press, September 1899, p. 416. 

 Synalpheus Brockü G. Nobili, in: Annuario del Museo Zoologico di Napoli, Vol. I, N° 3, 



1901, p. 2. 



Stat. 33. March 24/26. Bay of Pidjot, Lombok. 22 m. and less. Mud, coral and coralsand. 



1 male. 

 Stat. 164. August 20. i°42'.5 S., I30°47'.5 E. Between Misool and New Guinea. 32 m. Sand, 



small stones and shells. 1 male and 1 fully adult, ova-bearing female. 

 Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 

 36 m. Coral and Lithothamnion. 1 male and 1 ova-bearing female. 



The female from Stat. 164 is 30 mm. long, larger than those previously described. 



I2 5 



