253 



Lcngth of merus 



Width of merus 



Proportion between length and width of merus. 



Length of carpus 



Width of carpus 



Proportion between length and width of carpus 



Length of propodus 



Width of propodus. : 



Proportion between length and width of propodus. 



Length of dactylus 



Width of dactylus 



Proportion between length and width of dactylus . 



N» 6. 

 1,85 

 0,52 



3,5Ö 

 0,75 

 0,32 



2,34 



6 



i,45 



0,28 



5 



0,31 



0,14 



7 1 



N° 1 female long 19 mm. and N° 2 male long 12 mm., both from Reef Naifaro; 

 N° 3 adult female long 20 mm. from Stat. 96; N° 4 male long 15 mm. and N° 5 female long 

 19 mm., from Stat. 164; N° 6 ova-bearing female long 17 mm. from Stat. 282. 



The numbers above the length of the propodi indicate with how many spinules the 

 posterlor margin of these joints is armed, exclusive those at the distal end. 



As results from these Tables, the measurements of the female (N° 6) from Stat. 282 

 are more or less intermediate between those of the specimens from the Reef Naifaro and those 

 of the other specimens collected by the "Siboga". 



General distribution of the typical species: Red Sea (Paulson); Reef Naifaro 

 (Coutière). 



f 19. Synalpheus Bakert Cout. var. Stormt n. 



Alpheus sp., varietas B, J. G. de Man, in: Zoolog. Jahrb. IX. Abth. f. Syst. 1897, p. 741, 



PI. 35, Fig. 62c and 62cc. 

 Confer: H. Coutière, in: Buil. Soc. Philom. Paris, 1908, p. 9 and in: Proc. U.S. Nat. 



Museum, 1909, p. 91. 



Balikpapan, east coast of Borneo, 5 specimens, of which 3 are adult and egg-bearing, collected 

 by Mr. J. W. TisSOT VAN Patot and belonging to the Zoological Museum of the University 

 of Amsterdam. 



Atjeh, one of the four specimens collected by Captain STORM and described by me in 

 1897 (1. c.)j this specimen belongs to my private collection. 



Synalpheus Bakert was founded by Coutière in 1908 on 2 specimens, a male and 

 a female, from South-Adelaide, South Australia; as the above mentioned specimens show some 

 slight differences from Coutière's descriptions, they will here be described as a variety, dedicated 

 to the memory of Captain Storm. 



The slender, acuminate rostrum, which is 4-times as long as wide at its base, usually 

 reaches to the apex of i st antennular article ; in an adult, egg-bearing female from Balikpapan 

 it does only reach to the distal third of the visible part of the article and in the young specimen 

 from Atjeh it also does not extend to the apex of this article. The lateral spines which are also 

 pointed and acuminate, are one-fourth to one-third shorter than the rostrum and are, like the 



SIBOGA-EXPEDITIE XXXIX a'. 



33 



