413 



53- Alpheus Euphrosyne de Man. 



Alp heus euphrosyne J. G. de Man, in: Zoolog. Jahrb. IX, Abth. f. Syst. 1897, P- 745» Taf. 36, 

 fig. 64 and in: Memoires Soc. Zool. France, 1S98, p. 317, PI. IV, fig. 2. 



One specimen from the Postillon Islands, presented by Mr. Jacquin of Makassar. 



This specimen, 58 mm. long and without eggs, is much injured, having lost the i st , 3 rd 

 and 4 111 legs; it is larger than the specimens hitherto known. The rostrum reaches almost to the 

 middle of the visible part of first antermular article and the scaphocerite is a little longer than 

 the antermular peduncle. The carpal segments of the 2 nd legs are 4,4 mm., 2,9 mm., 0,9 mm., 

 0,9 mm. and 1,6 mm. long, the chela 2,75 mm. (palm 1,2 mm,, fingers 1,55111111.); the second 

 segment is just one and a half as long as the first. 



General distribution: Java Sea (de Man); Bangkok (de Man). 



f54. Alpheus microrhynchus de Man. 



Alpheus sp. {microrhynchus) J. G. de Man, in: Zoolog. Jahrb. IX, Abth. f. Syst., 1897, p. 752, 

 Taf. 2>6, fig. 65 and in: Mémoires Soc. Zoolog. France, XI, 1898, p. 318, PI. IV, fig. 3. 



Alpheus microrhynchus G. Nobili, in : Annali Mus. Civ. Storia Nat. Genova, Ser. 2 a , Vol. XX, 

 1900, p. 479 and in: Bollet. Mus. Zool. Torino, XVIII, 1903, p. 7. 



Stat. 4. March 9. 7°42' S., H4°i2'.6E. Anchorage off Djangkar (Java). Shore. 1 adult female 



without eggs and 1 very young specimen. 

 Stat. 71. May 10 — June 7. Makassar. Depth up to 32 m. Mud, sand with mud, coral. 1 adult 



female without eggs. 



The female from Makassar is full-grown, 85 mm. long, twice as large as the specimens 

 heretofore described, the larger specimen from Stat. 4 is 61 mm. long. 



The small, acute rostrum reaches in the female from Makassar to the second third of 

 the visible part of first antennular article, it just reaches beyond the rounded, anterior margin 

 of the orbital hoods and is continued as a narrow, obtuse carina, that slightly broadens 

 backward and that only extends as far as the corneae of the eyes; the depressions between 

 this crest and the orbital hoods are broad, but not deep, though quite distinct. The orbital 

 region projects slightly farther than in the younger specimens from Pontianak, described in 1897. 



Telson one4ïfth longer than its greatest width anteriorly and the latter is in proportion 

 to the posterior margin as 4:3. Upper surface flattened, feebly grooved in the median line, 

 anterior pair of spinules placed just in the middle and these spinules are one and a half as 

 far distant from one another as those of the posterior pair. In this specimen the spines near 

 the postero-lateral angles are missing, but in the female from Stat. 4 they are very small, 

 the inner 0,25 mm. long, the outer half that length. In this specimen the telson appears less 

 broad in proportion to its length, resembling more that of A. Euphrosyne and the anterior pair 

 of spinules is inserted just in front of the middle. 



The antennular and antennal peduncles agree with those of the younger specimen, 

 figured by me (1. c. 1897, fig. 65) and in both specimens the- scaphocerite is just as long as 

 the antennular peduncle; the terminal spine extends, however, not so far backward, reaching 

 only to the distal end of 2 nd antennular article and in the large specimen from Makassar it 



281 



SIBOGA-EXPED1TIE XXXIXö'. 53 



