2 9 7 



the s a m e in both hooks, the dorsal hook being but very slightly broader at its base 

 than the other. The notch between both hooks appears, like in Syn. laticeps, triangular, obtuse 

 at base. 



Eggs large, 1,46 mm. long. 



Remarks. Synalpheus biunguiculatus (Stimps.) Coutière 1905 from the Maldive Ar- 

 chipelago differs from Syn. Antenor by the less slender antennular peduncle, the second article 

 of which is shorter with regard to the first, by the longer scale of the scaphocerite reaching 

 beyond the second article, while the terminal spine projects less f a r beyond it. The stylocerite 

 is shorter, the upper angle of the basicerite has a spine. The spinules on the upper surface 

 of the telson show a quite different arrangement, as they are implanted much nearer to 

 the lateral margins and not at the angles of a quadrate. The fingers of the large chela are 

 longer, those of the small chela are not enlarged and the ventral hook of the dactyli 

 appears broader at its base than the other. There are probably still more differences. 



Table A. 



Proportion between the length of the telson and the width of the posterior margin 

 Proportion between the width at the base and that of the posterior margin .... 

 Proportion between the length of the telson and the distance of the anterior pair of 



spinules from the posterior margin 



Proportion between the distances of either pair of spinules from the posterior margin 



No 3. 

 3.65 

 2,5 



1,9 



1,6 



Table B. 



Proportion between the length and the width of the merus .... 

 Proportion between the length of the first segment of the carpus and 



the sum of the follöwing 



Proportion between the length and the .thickness of first carpal segment 



of 



>nd k 



Table C. 



! Merus 

 Carpus 

 Propodus 



Proportion between the length of the merus and that of the propodus 

 Proportion between the length and the width of the merus .... 

 Proportion between the length and the width of the propodus . . . 



N° 1 adult male from Amboina (private collection); N° 2 adult ova-bearing female from 

 Stat. 164; N° 3 young specimen from Stat. 154. 



General distribution 1 ): Amboina (de Man); Bay of Batavia (Pulo Edam and Pulo 

 Noordwachter) (de Man). 



1) It seems to be impossible to decide which are the species that have been referred to Syn. biunguiculatus by Borradaile. 

 Lenz and Nobili. Theiefore the localities mentioned by these authors have been omitted. 



165 



