289 



The merus of the large cheliped of the female is 1,83-times as long as wide, upper 

 margin unarmed at apex, but the infero-external and the infero-internal margin carry an acute 

 tooth at the distal end. Relative dimensions of the large chela: fingers i; total length 4,3; 

 height 1,53, this chela being 2,8-times as long as high. Anterior margin of the palm terminating 

 in a rather large, conical, though obtuse tooth or tubercle that is directed obliquely upward, 

 upper surface of this tooth setose. 



Merus of small cheliped 2,7-times longer than wide, the three margins unarmed at apex. 

 Proportion between the length of both chelae 2,1. Relative dimensions of small chela: fingers i; 

 total length 2,64; height 0,95, this chela being 2,76-times as long as high. Dactylus slender, 

 tapering, with a few scattered setae above and near the margins. 



Second legs rather slender. Merus 6,8-times longer than wide; first carpal segment 6,55- 

 times longer than thick at the distal end, 1,31-times as long as the sum of the four following; 

 the second, the third and the fourth segment are equal, slightly longer than thick. 



The proportions of the third pair are: merus 2,38; carpus i; propodus 1,87, the merus 

 1,27-times longer than the propodus. Merus rather stout, 3,36-times as long as wide, its posterior 

 margin armed, from the proximal articulation to the distal fourth, with nine short, stout 

 spinules, that are 0,14 — 0,18 mm. long. Propodus 5,3-times as long as wide, armed with 

 nine spinules, which are 0,15 — 0,17 mm. long. Taken from the proximal extremity of the 

 anterior margin to the tip of the ventral hook, the dactylus measures almost one-seventh the 

 length of the propodus and it is about half as wide near the articulation as long. Ventral hook 

 twice as long as broad at its base, its anterior margin perpendicular to the posterior border 

 of the dactylus, which border the ventral hook rejoins by a concave curve of short radius ; dorsal 

 hook a little longer, both hooks slightly divergent, notch between them concave at base. 



Merus of fourth pair with seven spinules, similar to those of the third. 



Ova rather numerous, 0,8 — 0,88 mm. long. 



Length of ova-bearing female 19,5 mm. 



138. Synalpheus septcinspinosiis de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 297. 



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

 36 m. Coral and Lithothamnion. i specimen. 



A new species of the Bitinguiailatiis group, related to Syn. pachymeris Cout. and to 

 Syn. 6ihi6erc2ilatiis de Man, but distinguished from all other species of this genus bj- the 

 armature of the sixth abdominal somite. 



Rostrum subacute, tolerably slender, 5-times as long as wide in the middle and reachino- 

 almost to the middle of the visible part of first antennular article ; lateral teeth triangular, 

 subacute, a little more than half as long as the rostrum and one and a half as wide 

 at their base as they are long; the outer margin of the lateral teeth is distinctly concave and 

 the tips of these teeth that are directed straight forward and not upward, are slightly setose. 

 Notches between the rostrum and the lateral teeth wide, just as wide anteriorly as they are lono-. 



157 



