134 EXPLANATION OF PLATES. 



Fig. 8. Outline of shorter Ascidiozooid, 1 mm. in length, with two 

 embryos in incubatory pouch. 



Fig. 9. Outline of another similar Ascidiozooid, 3 mm. in length and 

 2 mm. in greatest breadth. 



Fig. 10. Outline of another larger Ascidiozooid, with very long pedicle 

 between thorax and abdomen. 



Fig. 11. Piece of branchial sac. 



Fig. 12. Piece of branchial sac of Ascidiozooid from another colony. 



Fig. 13. One of the dorsal languets. 



Fig. 14. Piece of an ectodermal vascular appendage, showing branch- 

 ing S. 1. 



Fig. 15. End of another appendage, showing young branches growing 

 out into test. S. 1. 



PLATE PCL. I. 



Fig. 1. Amaroucium rotundatwn, n. sp., colony, reduced in size. 



Fig. 2. Part of branchial sac. 



Fig. 3. Three of the very long dorsal languets. 



Fig. 4. An Ascidiozooid. 



Fig. 5. Polyclinum clava, n. sp., colony, nat. size. 



Fig. 6. An Ascidiozooid. 



Fig. 7. Part of branchial sac. 



Fig. 8. Some of the short, stout, close languets. 



Fig. 9. Polyclinum deprcssum, colony, nat. size. 



Fig. 10. An Ascidiozooid. 



Fig. 11. Part of branchial sac. 



Fig. 12. Some of the small tentacular languets. 



Fig. 13. Polyclinum (?) nigriim, n. sp., colony, nat. size. 



Fig. 14. An Ascidiozooid, showing especially the alimentary canal. 



Fig. 15. Part of test. 



Fig. 16. Part of branchial sac and dorsal languets. 



PLATE PCL. II. 



Fig. 1. Polyclinum yiy ante um, n. sp., colony, nat. size. 



Fig. 2. Larger colony of the same species. 



Fig. 3. Polyclinum ylobosum, n. sp., colony, slightly reduced, surface 



view. 

 Fig. 4. Another colony in section, to show Ascidiarium and peduncle 



and the position of the ascidiozooids, nat. size. 



