TUNICATA. 



34 



ii 



PLATE VII. 



Fig. 1. Gynamdrocarpa imthurni, n. sp., group of Fig. 



ascidiozooids. 



2. Fart 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 -10. ,, 



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. Dia/ndroampa 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. Figs 



14. 

 15. 



II). 



17. 



IS. 



19. 

 20. 



21. 



22. 

 23. 



24. 

 25. 



26. 



. 27 



The tentacles, x 40. 

 The gonads of one side, x 40. 

 Part of the branchial sac. x 10. 

 Marginal vessels from the test, x 40. 

 Branchial and atrial apertures, showing- 

 tentacles, &c. x 40. 

 Botryllus ater, n. sp. Nat. size. 

 The terminal knobs of vessels in the test. 



x40. 

 Botrylhides chevalense, n. sp. Nat. size. 

 Four adjacent ascidiozooids. x 40. 

 Part of branchial sac magnified more 



highly. 

 Some of the branchial tentacles, x 100. 

 Botrylhides nigrum, n. sp. Nat. size. 

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

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



PLATE VIII. 



Fig. 1. Hypurgon skeati, Sollas, showing arrange- Fig. 17. 

 ment of ascidiozooids, enlarged. 



,, 2. Psammaplidium aura/nMacum, 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. PsammapUdium 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. Lepioclinum ramosiim, 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. Leptoclinum ceylonicwm, 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. 



Leptoclinum margaritiferce, 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. 



Cysfodytes ceyhnensis, 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. 



Leptoclinum 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 riri'l>, n. sp.. ;i large and a small 

 colony. Nat. size. 



Section of test, x 300. 



Small colony, mounted whole, x 40. 



Thorax of ascidiozooid. x 300. 



