212 SPOLTA ZEYLANICA. 



9. Total length, 0-75-0 -80 mm. 



The proportions of cephalothorax and abdomen are as 3 : 

 The head and first thoracic segment are fused together, as also 

 in adult specimens are thoracic segments i and 5, though in 

 immature forms the line of separation between the latter can 

 readily be made out. The posterior thoracic margin is rounded 

 and is devoid of spines. The rostrum is bifid, and is long and 

 slender. 



The abdomen consists of four segments, having with the 

 furcal rami the following proportions : 17 : 10 : 10 : 15 : 13. 

 The first segment shows a prominent genital swelling on the 

 ventral aspect. 



The -first antenna when folded back reaches to the end of 

 the furcal rami, the first and second segments are fused, and 

 the line of separation between segments 8 and 9 is not com- 

 plete, being only present on the posterior aspect. 



The antennal joints have the following proportions : — 



Segments: 1-2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 

 120 32 32 36 36 29 26 28 28 29 34 38 



Segments : 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 

 36 36 40 40 44 44 44 48 44 52 44 60 



The mouth 'parts closely resemble those of A. inermis, but 

 the mandible is sliuihtly different ; the arrangement of the 

 teeth is the same, but the separate first tooth has a longer and 

 somewhat narrower basal portion. The swimming legs in 

 these two species are \ ery similar ; in both cases the external 

 margin of the exopodites is devoid of any spines, but in the 

 present form there are no spines on the posterior aspect of 

 exopod 2 in the second to fourth pairs. 



(J. Total length, 0*8 mm. 



The proportional lengths of cephalothorax and abdomen 

 are 2*25 : I. The abdomen consists of five segments, having 

 with the furcal rami the proportional lengths 10 : 20 : 15 : 15 : 

 13 : 12. 



