EXPLANATION OF PLATES. 139 



Fig. 4. Small part of section of test, highly magnified, showing the 



ova and young buds in the vessels. S. ^. 

 Fig. 5. Young buds in vessels of test. S. . 



Fig. 6. Part of the branchial sac, from endostyle to dorsal lamina. S. 1. 

 Fig. 7. Ascidiozooid from left side. 



Fig. 8. Branchial siphon from inside, to show tentacles. 

 Fig. 9. Colony of Sarcobotrylloides anceps, n. sp., adhering to colonies 



of Polyzoa. 



Fig. 10. Part of the branchial sac and interior of branchial siphon. S. 1. 

 Fig. 11. Part of mantle, to show masses of purple pigment cells. 

 Fig. 12. Part of section of test. 

 Fig. 13. Alimentary canal. S. J. 



PLATE BOT. III. 



Fig. 1. Colony of Sarcobotrylloides pannosum, n. sp., less than nat. 



size. 



Fig. 2. Ascidiozooids of same, with alimentary canal showing through. 

 Fig. 3. Part of the branchial sac near the dorsal edge, showing irregular 



stigmata. 



Fig. 4. More regular part of the branchial sac. 

 Fig. 5. Branchial siphon, &c. , from the inside. 

 Fig. 6. Stomach in surface view, showing caecum and folds, in 



Sarcobotrylloides purpureum. 



Fig. 7. Stomach of the same in oblique section, showing folds. 

 Fig. 8. Colony of Sarcobotrylloides purpureum, nat. size. 

 Fig. 9. Part of a section showing the vessels near the surface of the 



test. S. 1. 

 Fig. 10. Colony of Sarcobotrylloides pnrrjitreum, nat. size. 



THE END. 



n BY T. DOBB & CO., BROWJfLOW HILL, I.IVKHl'OOI,. 



