255 



As is shown in Table A, the telson appears in older specimens a little wider anteriorly 

 with regard to the posterior margin than in the younger ones. The posterior margin is semi- 

 circular, rather prominent, the outer angles are spiniform, in adult specimens almost half as long 

 as the length of the posterior margin, measured in the middle line, but in younger individuals the 

 outer angles are shorter. In the adult individuals the spinules of the upper surface are 0,32 mm. 

 long, one-eighth the length of the telson, in the young specimen from Atjeh they are comparatively 

 shorter, measuring one-eleventh the length of the telson. In all the specimens the distances of both 

 pairs of spinules from the posterior margin are in proportion to one another like 5 : 3. 



Table A. 



Length of the telson 



Width at the base 



Width of the posterior margin 



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 both pairs from the posterior margin .... 



Table B. 

 Measurements of 2"*^ legs in millimeters. 



Length of the merus 



Width of the merus 



Proportion between length and width 

 Length of i^t carpal segment . 

 Width of this segment at the far end 

 Proportion between length and width 



Length of 2nd segment 



Width of 211'i segment 



Length of 3''! segment 



Width of 3id segment 



Length of 4'h segment 



Width of 4* segment 



Length of 5th segment 



Width of 5'h segment 



Length of the chela 



Length of the palm 



NO I. 

 2,7 mm. 

 2,34 mm. 

 1,22 mm. 

 2,21 



1,9 



1,66 

 1,7 



Length of the fingers 



NO 3. 

 2 



0,35 



5.7 

 1,18 

 0,28 

 4,2 

 0,22 

 0,28 

 0,24 



0,22 



0,5 



1,04 

 0,47 



o,57 



NO 3. 



1.7 



1.7 



Table C. 



! Merus 

 Carpus 

 Propodus 



Proportion between length and width of the merus 



Proportion between length and width of the propodus 



N" I adult egg-bearing female, long 21 mm., from Balikpapan; N" 2 younger specimen, 

 long 14 mm. from the same locality; N" 3 specimen, without eggs, long 11 mm. from Atjeh. 



123 



N»3- 

 2,3 



I 

 2,1 



4 



7 



