TUNICATA. 



347 



PLATE VII. 



Fig. 1. Gynandrocarpa imthnrni, n. sp., group of 



ascidiozooids. 



2. Part of the colony in profile. 

 ,, 3. Part of a section to show the flattening of 



the ascidiozooids. 



4. Part of the branchial sac. x 40. 

 5. The tentacles and dorsal tubercle, x 40. 

 ,, 6. The dorsal tubercle more magnified. 

 7. The atrial tentacles, x 40. 

 8. The hermaphrodite gonad. x 40. 

 '9. The same in profile, x 40. 

 10. Diandrocarpa brakenhielmi, var. ceylonica. 



Nat. size. 

 ,, 11. A few ascidiozooids showing pigmentation 



and marginal vessels, x 20. 



12. Ascidiozooid removed from the test, x 25. 

 13. The alimentary canal, x 40. 



Fig. 14. 



15. 



,, 10. 



17. 



18. 



,, 19. 



20. 



21. 



,, 22. 



23. 



24. 



25. 



26. 



The tentacles, x 40. 



The gonads of one side, x 40. 



Part of the branchial sac. x 40. 



Marginal vessels from the test, x 40. 



Branchial and atrial apertures, showing 



tentacles, &c. x 40. 

 Botryttus ater, n. sp. Nat. size. 

 The terminal knobs of vessels in the test. 



x40. 



Botryttoides chevalense, n. sp. Nat. size. 

 Four adjacent ascidiozooids. x 40. 

 Part of branchial sac magnified more 



highly. 



Some of the branchial tentacles, x 100. 

 Botrylloides nigrum, n. sp. Nat. size. 

 Colella arenosa, n. sp., head, x 3. 



Figs. 27 to 29. Parts of a colony. Nat. size. 



PLATE VIII. 



Fig. 1. Hypurgon skcati, SOLLAS, showing arrange- Fig. 17. 



ment of ascidiozooids, enlarged. 



,, 2. Psammaplidium aurantiacnm, n. sp., section ,, 18. 



of test. ,, 19. 

 3. Section of colony (nat. size), to show 



ascidiozooids. 20. 



4. Surface to show ascidiozooids and sand, ,, 21. 



enlarged. 22. 



Figs. 5 and 6. Ascidiozooids. x 40. ,, 23. 

 Fig. 7. Psammaplidium sp. B, showing the red 



grains around the ascidiozooids. 24. 



,, 8. Psammaplidium ceylonicum, n. sp., an 25. 



ascidiozooid. x 40. ,, 26. 



,, 9. The terminal process of the post-abdomen, 27. 



enlarged. 



10. Section of the colony. Nat. size. 28. 



,, 11. Surface of colony, a little enlarged. ,, 29. 



12. Leptodinum ramosum, n. sp., section of ,, 30. 



colony, enlarged. 31. 



13. Deeper section to show network of spicules. 32. 



x20. 33. 



,, 14. Single spicule. x 40. 34. 

 ,, 15. Leptodinum ceylomcum, n. sp., section across 



a bar of the colony. Nat. size. 35. 



,, 16. Optical section of a passage through the 36. 



colony. Nat. size. 37. 



2 Y 2 



Surface showing common cloaca, &c., a 

 little enlarged. 



Two spicules. x 40. 



Leptodinum maryaritiferw, n. sp., horizontal 

 section, x 40. 



Part of test, x 300. 



Testis and spiral vas deferens. x 300. 



One side of branchial sac. x 300. 



Cystodytes ceylonensis, n. sp., three colonies. 

 Nat. size. 



Overlapping calcareous discs, x 40. 



One disc showing structure, x 50. 



Didemnum areolatum, n. sp. Nat. size. 



Section of colony, some spicules en- 

 larged. 



Leptodinum viride, n. sp. Nat. size. 



Section through upper surface, x 300. 



A deeper section, x 300. 



A spherical pigment cell, enlarged. 



One of the spicules. x 1000. 



Surface view of the colony, x 40. 



Diplosoma viride, n. sp., a large and a small 

 colony. Nat. size. 



Section of test, x 300. 



Small colony, mounted whole, x 40. 



Thorax of ascidiozooid. x 300. 



