296 CEYLON PEARL OYSTER REPORT. 



Fig. 17. Ponielhpsis lierdmani, n. sp., female, 5th pair of natatory legs, x 106. 



18. Metacalwnm awivilMi, Cleve, female, 5th pair of natatory legs, x 552. 



19. ,, ,, abdomen and furca. x 552. 



,, 20. ., ., male, 5th pair of natatory legs. x 159. 



,, 21. Psetulodiaptomus salinus, GlESBR., female, 5th natatory leg. x 159. 



,. 22. ,, ,, male, 5th pair of natatory legs. x 159. 



23. ,, .. ,. abdomen and furca. x 159. 



., 24. Pseudodiaptamiis aurivillii, Cleve, female, 5th natatory leg. x 159. 



25. ,, male, 5th pair of natatory legs. x 159. 



26. ,, abdomen and furca. x 159. 



PLATE III. 



Fig. 1. Suiuiristes inopinata, n. sp., female, from left side, x 80. 



,, 2. ,, ,, anterior antenna. x 156. 



3. ,, ,, 1st natatory leg. x 90. 



4. 2nd x 120. 



5. 4th x 120. 



6. last abdominal segment and furca. x 60. 



,, 7. ,, ,, male, apical joints of anterior antenna. x 195. 



,. 8. ,, ,, female, 5th natatory leg. x 390. 



,, 9. Sunaristes longipes, n. sp., female, from left side, x 80. 



,, 10. ,, ,, ,, 4th natatory leg. x 120. 



,,11. ,, ,, last abdominal segments and furca. x 60. 



,, 12. Sunaristes curticaudata, a. sp., female, from left side, x 80. 



,, 13. ,, ., anterior antenna. x 111. 



,, 14. ,, ,, 2nd natatory leg. x 120. 



15. 3rd x 120. 



16. 4th x 120. 



,, 17. ,, ,, ,, last abdominal segments and furca. x 90. 



,, 18. Hevsiliodes (hdria, n. sp., male, from above. x 45. 



,, 19. ,, anterior antenna. x 90. 



,, 20. ,, ,, posterior antenna. x 180. 



21. ,, ,, mandible. x 260. 



22. ,, ,, ,, maxilla. x 260. 



,, 23. ,, ,, ,, 1st maxilliped. x 260. 



24. 2nd x 90 



25. ,, 1st natatory leg. x 120. 



26. 4th x 120. 



27. 5th x 180. 



PLATE IV. 



Fig. 1. Tegastes imlhwni, n. sp., female, from right side, x 106. 



,, 2. ,, ,, another female, from left side. x 159. 



,, 3. ,, female, anterior antenna. x 195. 



,, 4. ,, ,, ,, 2nd maxilliped. x 195. 



5. ,. 1st natatory leg. x 136. 



6. 2nd x 90. 



