279 



The eggs are rather numerous, those of the female, long 21,5 mm., are 1,17 mm. long, 

 those of a female, long 14,5111111., from the Jedan Islands, 1,02 mm. and those of a female 

 from Stat. 315 are 1,09111111. long. 



Table A. 



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 



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



anterior pair from the posterior margin 



Proportion between the distances of both pairs from the posterior 



margin 



N« 1. N» 2. N» 3. N» 4. N» 5. N» 6. 



2,2 



i.4 

 1,6 



Table B. 



Proportion between the length and the width of the 

 merus 



Proportion between the length of the first carpal 



segment and the sum of the following 



Proportion between the length and the width of first 



of second legs 



N» 1. N° 2. N» 3. N» 4. N» 5. N« 6. 



4,2 



1,2 



3-1 



Table C. 



j Merus 



Relative dimensions of j 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. . 



of third legs 



No 1. N» 2. N° 3. N» 4. No 5. N"o 6. 



2-7 



I 



i.5 



i,8 

 3-2 

 3-75 



X° 1 specimen long 11,5 mm. from Stat. 78; N° 2 ova-bearing female, long 21,5 mm., 

 from Stat. 164; X" 3 young specimen, long 7,5 mm., from Stat. 184; N° 4 male, long 12,5 mm., 

 from Stat. 273; N° 5 specimen from Stat. 282; N° 6 cotype of Syu. pachymeris Cout. from 

 Saya de Malha, long 10,5 mm. 



Remarks. Synalpheus pachymeris Cout. at once differs by the anterior margin of the 

 palm of the large chela terminating only in one tubercle, which is directed straightly 

 forward and not obliquely upward. It differs also by the terminal spine of the scaphocerite 

 being not longer, but distinctly shorter than the antennular peduncle. The relative dimensions 

 of both chelae are the same in the two species, but the merus appears a little stouter, 

 that of the large cheliped being 1,66-times, that of the smaller 2,6-times longer than wide and 

 the merus of the larger carries an acute tooth at the apex of the upper margin. The measurements 



147 



