346 



CEYLON PEARL OYSTER REPORT. 



PLATE V. 



Fig. 1. Polycarpa auraia, Q. and G. Nat. size. Fig. 20. 



2. Section of the test, to show the pigment 21. 



in the vessels, x 40. 22. 



3. Part of the mantle, to show the pigment 



masses, x 40. 23. 



4. Dorsal edge of prebranchial zone, x 5. 



5. Surface of dorsal tubercle, x 40. 24. 



6. Part of branchial sac. x 40. 25. 



Figs. 7 to 9. Styela lapidosa, n. sp. Nat. size. 26. 



Fig. 10. Test removed, from left side. Nat. 27. 



size. ,, 28. 



11. Another specimen with finer sand. 29. 



12. The same, test removed, left side. 30. 



13. Another specimen, right side. 31. 



14. Part of branchial sac. x 40. 32. 



,, 15. The tentacles and dorsal tubercle, x 40. 33. 



16. Polycarpa sluiteri, n. sp. Nat. size. 34. 



17. Dorsal tubercle and tentacles, x 40. 35. 



Figs. 18 and 19. Dorsal tubercle of two other 36. 



specimens, x 40. 37. 



PLATE VI, 



Fig. 1. Polycarpa colletti, n. sp. Nat. size. Fig. 20. 



2. Tentacles and dorsal tubercle. 21. 



3. Diagram of a branchial fold. 22. 



4. Part of the branchial sac. ,, 23. 



5. Polycarpa palkensis, n. sp., removed from ,, 24. 



the sandy test. Nat. size. 25. 



6. Dorsal tubercle, x 40. ,, 26. 



7. Part of branchial sac. x 40. 27. 



8. One of the gonads. x 25. 28. 



9. Polycarpa vrillisi, n. sp. A little enlarged. 29. 



10. With test removed. Nat. size. 30. 



11. Branchial aperture. Enlarged. ,, 31. 



12. Part of branchial sac. x 40. 32. 



13. Tentacles and dorsal tubercle. 33. 



14. Inside of body-wall, opened venlnilly, to 34. 



show the gonads. p., poly carp; end., 



endocarp. 



.. 15. A pigmented endocarp. 35. 



1 6. Polycai-pa inanaarensi's, n. sp. Nat. size. 36. 



17. Dissection to show wide prebratichial zone 37. 



between tentacles and dorsal tubercle. 38. 



Enlarged. 



Figs. 18 and 19. Dorsal tubercle of two indi- 39. 



viduals. 



Gonads of left side. Nat. size. 



Part of branchial sac. x 40. 



Group of four Polycarpa chalmersi, n. sp., 



on a piece of coral. Nat. size. 

 Polycarpa chalmersi adhering to Eamulina 



tubes. Nat. size. 

 Part of branchial sac. x 40. 

 Dorsal tubercle, x 40. 

 One of the polycarps. x 40. 

 Styela ascidioides, n. sp. Nat. size. 

 Branchial aperture of same, enlarged. 

 Test removed, left side. Nat. size. 

 Section of test, x 40. 

 Tentacles and dorsal tubercle, x 40. 

 Part of branchial sac. x 40. 

 Polycarpa alentura, n. sp. Nat. size. 

 Alimentary canal. Nat. size. 

 Two anterior dorsal languets. x 40. 

 Dorsal tubercle, &c. x 40. 

 Part of the branchial sac. x 40. 



Tentacles. 



Dorsal lamina, x 40. 



Part of branchial sac. x 40. 



Poli/carpa sp. (?). Nat. size. 



Styela pigmentata, n. sp. Nat. size. 



Part of branchial sac. x 40. 



Dorsal tubercle, x 40. 



Polycarpa twynanti, n. sp. Nat. size. 



Rectum, showing fringed anus. Enlarged. 



Dorsal tubercle. 



Another specimen, right side. Nat. size. 



Part of branchial sac. x 40. 



Tentacles and dorsal tubercle, x 20. 



Polycarpa detipwns, n. sp. Nat. size. 



Diagram of one side of branchial sac, to 

 show the folds (I.-IV.) and the number 

 of stigmata in the meshes (14, 10, 8,&c.). 



Part of branchial sac. x 40. 



Dorsal tubercle, x 40. 



Alimentary canal and gonads. Enlarged. 



A polycarp, showing the ducts (o.d. and 

 v.d.). x 30. 



Some of the spermatic ciuca from a poly- 

 carp, x 40. 





