293 



carpus i ; propodus 1,9, the merus is 4-times as long as wide, like in Coutière's young specimen, 

 the propodus 5,7-times and the latter appears also more slender than in older specimens. 

 General distribution: Sulu Sea (Dana); Feejee Islands (Dana). 



f40. Synalpheus Theano de Man. 



J. G. DE MAN, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 296. 



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 specimen without eggs. 



A new species of the Biunguiculatus group, closely related to Syn. neptumis (Dana). 



Rostrum short, acute, about 4-times as long as broad or wide in the middle, hardly 

 reaching beyond the middle of the visible part of first antennular article ; lateral spines triangular, 

 though rather obtuse and only very slightly shorter than the rostrum ; the notches separating 

 the lateral spines from the rostrum are obtuse at their base and the three frontal spines project 

 straightly forward. 



Antennular peduncle 5-times as long as thick at the distal end of median article; visible 

 part of the first one and a half as long as the second ; third a little shorter than second ; 

 median article one-third longer than thick at the distal end. Stylocerite subacute, a little 

 shorter than basal antennular article. Carpocerite slender, 4, 5-times as long as wide in the 

 middle, surpassing the antennular peduncle by one-half the length of third article; upper angle 

 of basicerite acute, but devoid of a spine, lateral spine very large, extending to the 

 distal extremity of second antennular article. The terminal spine of the scaphocerite is not 

 curved inward, reaches to the distal third part of third antennular article and projects by three- 

 sevenths of its length beyond the tip of the rather narrow scale that reaches to the fourth distal 

 part of the median antennular article. 



The height or length of the telson equals 1, 5-times its base and 4-times its posterior 

 margin ; the posterior margin is slightly prominent in the middle, the outer angles are not 

 marked and the longer internal spinules, half as long as the posterior margin is wide, extend 

 by half their length beyond the latter. Spinules of the upper surface rather large, those of 

 the anterior pair 0,2 mm. long, those of the posterior 0,22 mm., the latter measuring just one- 

 seventh the length of the telson. These spinules are implanted near the lateral margins, the 

 anterior pair f ar before the middle, the proportion between the length of the telson and the 

 distance of the anterior pair from the posterior margin being 1,3, the proportion between the 

 distances of either pair from the posterior margin 1,5, the posterior pair being implanted 

 immediately before the middle. Proportion between the greatest width and that of the posterior 

 margin 2,66. 



Merus of large cheliped twice as long as wide, upper angle acute. Relative dimensions 

 of the large chela: fingers i; total length 3,85; height 1,4, the chela 2,7-times as long as 

 high; the anterior margin of the palm terminates, at the inner side, in an acute tubercle, that 

 is directed horizontally forward. 



Merus of small cheliped 3,42-times as long as wide, upper margin obtuse at the apex. 



161 



SIBOGA-EXrEDITIE XXXIX tf'. 38 



