244 SPOLIA ZEYLANICA. 



The third and fotirth pairs of legs are very similar to A, 

 cryihrsea. 



The fifth pair of legs bear a short external seta ; and the 

 terminal process is long and curved and is very slightly 

 swollen at the base. 



These examples very closely resemble the females of A. 

 crylhrsea, but the spinulation of the basal segments of the 

 first antenna and the form of the fifth pair of legs are different 

 and are quite characteristic. 



ACARTIA SOUTHWELLI, sp. UOV. 



(PI. XIX., figs. 8, 9.) 



Sev^eral examples, both male and female, of what appears 

 to be a new species of Acartia were obtained from Kalakarai. 

 The chief characters of these specimens are as follows : — 



?. Total length, 0-8 mm. 



Proportional lengths of cephalothorax and abdomen, 85 : 1. 



The head and first thoracic segment are separate, but the 

 fourth and fifth thoracic segments are fused together. 



The posterior thoracic margin is rounded, and is devoid of 

 spines. The anterior extremity is rounded, and bears a pair of 

 slender curved rostral filaments. 



The abdomen consists of thiee segments having, with the 

 furcal rami, the following proportions : — 20 : 13 : 10 : 15 ; all 

 the segments are devoid of any trace of spines, and the genital 

 segment is somewhat swollen and rounded. The furcal rami 

 are nearly as wide as long, 9 : 10. 



The first antennas, when folded back, reach just beyond the 

 posterior thoracic margin ; each consists of twenty joints, the 

 more proximal of which are, as usual, very indistinctly marked 

 off from one another, so that it is a matter of some difficulty 

 to determine their exact limits ; they appear to have the 

 following proportions : — 



Segments : 1. 2-4. 5-6. 7-8. 9-10. 11. 12. 13-14. 15. 16. 

 73 54 24 24 20 49 43 125 43 68 



Segments: 17. 18. 19. 20. 21. j 22. 23.^ 24. 25; 

 58 OS 49 49 49 34 63' 44 20 



