EXPLANATION OP PLATES. 135 



Fig. 5. Ascidiozooid from last colony, enlarged. 



Fig. 6. Two of the tentacular dorsal languets. 



Fig. 7. Small part of the branchial sac. 



Fig. 8. A tailed larva from the colony. 



PLATE PCL. III. 



Fig. 1. Polyclinum fuscum, n. sp., colony, nat. size. 



Fig. 2. Ascidiozooid of same, with larvae in incubatory pouch. S. 1. 



Fig. 3. Part of test, showing bladder cells containing crystals, and 



brown pigment masses. 



Fig. 4. Part of branchial sac. 



Fig. 5. Dorsal languets. 



Fig. 6. Circlet of tentacles from the branchial sac. 



Fig. 7. Amaroucium protectans, n. sp., colony on the back of a Dromia, 



nat. size. 



Fig. 8. Ascidiozooid from same. 



Fig. 9. Series of dorsal languets. 



Fig. 10. Part of branchial sac. 



Fig. 11. Amaroucium anomalum, n. sp., colony, nat. size. 



Fig. 12. Some of the dorsal languets. 



Fig. 13. Part of branchial sac. 



Fig. 14. Ascidiozooid. 



Fig. 15. Part of the branched gland from the intestine. 



Fig. 16. Part of the test, showing the system of branched " vessels." 



PLATE, PCL. IV. 



Fig. 1. Colella cyanea, n. sp., one-half nat. size. 



Fig. 2. Part of test. 



Fig. 3. Ascidiozooid. 



Fig. 4. Part of branchial sac. 



Fig. 5. Dorsal languets. 



Fig. 6. Circle of tentacles from the branchial siphon. 



Fig. 7. Amaroucium distomoides, n. sp., nat. size. 



Fig. 8. Section through edge of colony. 



Fig. 9. Part of test, showing a vascular stolon. 



Fig. 10. Masses of yellow pigment in mantle of post-abdomen. 



Fig. 11. Ascidiozooid. 



Fig. 12. Part of branchial sac and dorsal languets. 



Fig. 13. Dorsal tubercle and tentacles. 



