136 EXPLANATION OP PLATES 



Fig. 14. Polyclinum pnmum, n. sp., nat. size. 



Fig. 15. Ascidiozooid. 



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



PLATE PCL. V. 



Fig. 1. Psammaplidium solidum, n. sp., nat. size. 



Fig. 2. Section of test of same. S. 1. 



Fig. 3. An ascidiozooid. 



Fig. 4. Three of the branchial tentacles. 



Fig. 5. Part of the branchial sac. 



Fig. 6. Small colony of Psammaplidium lobatum, n. sp. 



Fig. 7. Large colony of Psammaplidium lobatum. 



Fig. 8. An Ascidiozooid. 



Fig. 9. Three of the dorsal languets. 



Fig. 10. Part of the surface layer of test. 



Fig. 11. Small part of the branchial sac. 



Fig. 12. A tailed larva from the peri-branchial cavity. 



PLATE PCL. VI. 



Fig. 1. Psammaplidium incrustans, n. sp., nat. size. 



Fig. 2. Part of branchial sac. 



Fig. 3. Dorsal languets. 



Fig. 4. Part of the colony seen in section, nat. size. 



Fig. 5. An Ascidiozooid. 



Fig. 6. A tailed larva from the peri-branchial cavity. 



Fig. 7. Psammaplidium peclunculatum, n. sp., three colonies, nat. size. 



Fig. 8. An Ascidiozooid. 



Fig. 9. Part of the branchial sac and dorsal languets. 



Fig. 10. Psammaplidium fragile, n. sp. 



Fig. 11. Part of the colony in section, nat. size. 



Fig. 12. An ascidiozooid. 



Fig. 13. Part of branchial sac, ventral edge. 



Fig. 14. Branchial aperture and circle of tentacles. 



PLATE DID. I. 



Fig. 1. Leptoclinmn fimbriatum, n. sp., colony, nat. size. 



Fig. 2. A common cloacal aperture, enlarged with lens. 



Fig. 3. Part of the test, showing spicules and an ectodermal process, 



magnified. 

 Fig. 4. Section through the colony, showing Ascidiozooids and spicules. 



S. 1. 



