210 ALPHEUS HIPPOTHOË VAR. 



NOTE XXX. 

 ON ALPHEUS HIPPOTHOË, DE M. VAR.? 



BY 



Dr. J. G. de MAN. 



Alpheus hippothoë de M. var. ? , in : Zoologische Jahr- 

 bücher, herausgegebeu von J. W. Spengel , Abth. f. System. 

 Vol. IX, 1897, p. 754, tab. 36, fig. 66. 



Two specimens, one of which carrying eggs, from the 

 Sugut river , North Eastern Borneo, collected by Mr. Prakke. 



Both specimens have the same size and measure about 

 18 millim. from the tip of the rostrum to the end of the 

 telson ; they are somewhat smaller than the Atjeh speci- 

 mens described 1. c, the largest of these being 28 millim. 

 long. Though both individuals are only provided with the 

 larger chelipede , they ought , however , to be referred to 

 the variety quoted above. The rostrum which reaches about 

 to the distal extremity of the first joint of the antennular 

 peduncle, scarcely extends backwards to the middle of the 

 cephalothorax ; the upper margin of the interocular com- 

 pressed portion of the rostrum appears slightly concave. 

 In both specimens the basal joint of the outer antennae 

 is armed with a very small spine on the anterior margin 

 of the inferior surface, not visible when looked at from above. 



In both individuals the larger hand fully agrees with 

 that of the Atjeh specimens , and this is also the case with 

 the carpal joints of the 2ud pair of legs. The five joints of 

 the carpus of these legs are respectively 1,9 — 0,76 — 0,44 

 — 0,44 and 0,7 millim. long, the first joint is a little 

 shorter than the four following together and 2'/2 times as 

 long as the second joint; the hand, measuring 1,6 millim., 

 is as long as the third , fourth and fifth joint together. 

 The following legs also agree with the Atjeh-specimens. 



The globular eggs of the female have a diameter of 0,5 mm. 

 lerseke, June 1898, 



^Notes from tlie Leyden jMuseuna, Vol. XX. 



