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The adult, egg-bearing specimens from Balikpapan are 20 and 21 mm. long, the egg- 

 bearing specimen from Atjeh, described in 1897, was only 11 mm. long. 



7 20. Synalpkeus Hcroni Cout. 



Synalpheus heroni H. Coutière, in: Proc. U.S. National Museum, XXXVI, 1909, p. 42. 



Stat. 58. April 25. Anchorage off Seba, Savu, Reef. 1 ova-bearing and 1 younger female. 

 Stat. 66. May 7/8. Bank between islands of Bahuluwang and Tambolungan, south of Saleyer. 

 8 to 10 m. Dead coral; Halimeda; Lithothamnion. 1 male. 



The three specimens are very well in accordance with the description. The rostrum in the 

 specimen from Stat. 66 is tvvice as long as broad at base and reaches to the middle of the visible 

 part of first antennular article; lateral spines rather obtuse, slightly shorter than the rostrum 

 and as long as wide at their base, the three frontal spines are setose at their tips, not curved 

 upward, but directed downward. Second antennular article one and a half as long as thick 

 distally, a little shorter than the visible part of the first, third a little shorter than second; 

 stylocerite extending, at the right side, to the 2 nd third part, at the left almost to the middle 

 of second article. Lower spine of basicerite longer than the stylocerite, but not yet reaching 

 the extremity of median antennular article, upper spine turned upward and measuring, in a 

 lateral view, one-third of the lower. The carpocerite extends by the whole length of third 

 article beyond the tip of the antennular peduncle, lateral spine of scaphocerite a little shorter 

 than the carpocerite, though much longer than the antennular peduncle; antennal scale reduced, 

 reaching to the apex of median antennular article. 



In the ova-bearing female from Stat. 58 the rostrum reaches almost the end of first 

 antennular article while the lateral spines only extend to the middle of its visible part ; the 

 stylocerite extends to the distal third part, the lower spine of the basicerite, however, to the 

 end of second article, whereas the upper spine appears a little shorter than in the other specimen. 

 The carpocerite is a little shorter than in the male from Stat. 66, the terminal spine of the 

 scaphocerite therefore as much surpasses the carpocerite as in Coutière's specimens and the 

 scale likewise somewhat extends beyond the second antennular article. The other specimen from 

 Stat. 58 resembles the female, but the terminal spine of the scaphocerite is as long as the 

 carpocerite and the frontal spines agree with those of the specimen from Stat. 66. The three 

 specimens therefore prove that also this species is somewhat variable as regards the length 

 of the rostrum, the stylocerite, the carpocerite and the spines of the basicerite. 



Telson of the specimen from Stat. 66 2,86-times as long as the posterior margin is 

 broad, greatest width twice as broad as the posterior margin ; the latter very prominent, its 

 outer angles acute, very short. Spinules of upper surface 0,14 — o, 16 mm. long, rather far distant 

 from the lateral margins ; proportion between the length of the telson and the distance of the 

 anterior pair from the posterior margin 1,95, the anterior pair situated immediately in front 

 of the middle; proportion between the distances of both pairs from the posterior margin 1,7. 



Upper margin of the merus of large cheliped truncate, unarmed. In the specimen from 

 Stat. 66 the relative measurements of the large chela are the following: fingers i; total length 

 3,15; height 1,25. These numbers closely agree with those mentioned by Coutière: i : 3,2; 1,32. 



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