27 



of Zehntner's paper, however, in: Revue Suisse de Zoölogie, T. II, 1894, PI. VIII, the fingers 

 are distinctly longer than one-third of die palm). The dactylus which in these half-grown 

 specimens appears less high than in the adult, according to Zehntner's figure, is armed at the 

 base with a very strong, obtuse tooth, that fits into a deep concavity of the immobile finger; 

 both the outer and the inner border of this concavity are armed with two small teeth ; at the 

 outer side these two teeth are of equal size and obtuse, at the inner side the distal tooth is 

 also obtuse but larger than those of the outer side and twice as large as the proximal tooth, 

 which is subacute, and between the latter and the articulation one observes a third tooth, which 

 is very sharp, almost spiniform and nearly of the same size as the distal tooth. In Zehntner's 

 figure these teeth are not visible, perhaps they are worn off in adult specimens. The upper 

 border of the palm is a little prominent at the inner side of the distal extremity, though obtuse, 

 but in a lateral view this prominence looks like a small tooth. 



The young specimen from Flores, finally, is only 1 1 mm. long and belongs perhaps to 

 the same species. The rostrum reaches just beyond the 2 nd antennular article, while the lateral 

 spines almost extend to the far end of the i st article. The telson is comparatively longer in 

 proportion to the width than in the other specimens, but the fingers measure about 1 L of the palm! 



Measurements of the telson. 



Proportion between the length of the telson and the width 

 of the posterior margin 



Proportion between the greatest width and that of the 

 posterior margin 



Length of the dorso-lateral spinules 



N'o 1 



3-1 



■7 2 



o,4S mm - 



N» 2 



3-5 



2,42 

 0,35 mm. 



No 4 



4,8 



2,4 



0,16 mm. 



N° 1 female from Stat. 89; N° 2 and 3 females from Krakatau ; N° 4 young specimen 

 from the northcoast of Flores. 



19. Synalpheus jcdanensis de Man. 



SynalpJiats jedancnsïs J. G. de Man, Siboga Exp., Monogr. XXXIX^ 1 , Part II, Family 

 Alpheidae, 1911 (text) p. 222, 191 5 (plates) PI. VII, fig. 27 — 27c. 



Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 

 1 3 m. Bottom sand and shells. 3 young specimens. 



One of the specimens is 6,5 mm. long from tip of rostrum to tip of telson. The rostrum 

 reaches to the distal extremity of basal antennular article, the lateral spines are a little shorter. 

 The antennular peduncle has a stouter shape than in fig. 27 (1. c), the 2 nd joint appears about 

 as long as wide, not longer than wide, and of the same size as the 3 rd . The proportion between 

 the length (0,95 mm.) of the telson and the distance between the postero-lateral angles is 3,15, 

 the telson appearing comparatively a little longer in proportion to the width of the posterior 

 margin than in full-grown specimens; the proportion between the greatest width anteriorly and 

 the width of the posterior margin is 2,27; the proportion between the length of the telson and 

 the distance of the anterior pair of dorso-lateral spinules, that are 0,1 mm. long, from the 



