132 EXPLANATION OF PLATES. 



PLATE CYN. XX. 



Fig. 1. Polycarpa aurata, var. plana, nov., right side, nat. size. 



Fig. 2. Part of branchial sac. S. 1. 



Fig. 3. Tentacles and dorsal tubercle, slightly enlarged. 



Fig. 4. Dorsal tubercle. S. 1. 



Fig. 5. Some of atrial tentacles. S. 1. 



Fig. 6. Polycarpa attollcns, n. sp., right side, nat. size. 



Fig. 7. Part of branchial sac. S. 1. 



Fig. 8. Dorsal tubercle. S. 1. 



Fig. 9. Dorsal tubercle of Polycarpa tinctor, Quoy and Gaimard. S. 1. 



PLATE MOL. I. 



Fig. 1. Molcjula mollis, n. sp., about nat. size. 



Fig. 2. Body removed from test, from left side, nat. size. 



Fig. 3. Part of branchial sac from inside. S. 1. 



Fig. 4. Dorsal tubercle and enormous hypophysial gland. S. 1. 



Fig. 5. Molgula sydncyejisis, n. sp., nat. size. 



Fig. 6. Body removed from test, from left side, nat. size. 



Fig. 7. Body removed from test, from right side, nat. size. 



Fig. 8. Part of branchial sac from inside. S. 1. 



Fig. 9. Dorsal tubercle and tentacles, enlarged. 



Fig. 10. Ascopera nana, n. sp., nat. size. 



Fig. 11. Body removed from test, from left side, nat. size. 



Fig. 12. Part of branchial sac from inside. S. 1. 



Fig. 13. Dorsal tubercle. S. 1. 



Fig. 14. A large tentacle. S. 1. 



PLATE DIST. I. 



Fig. 1. Colella tenuicaulis, Herdm., nat. size. 



Fig. 2. Group of four individuals of C. temiicaulis, half nat. size. 



Fig. 3. A small part of Ascidiarium of one of these, showing the 



arrangement of the Ascidiozooids, slightly enlarged. 



Fig. 4. Four individuals of C. tenuicaulis, nat. size. 



Fig. 5. Part of Ascidiarium of large specimen of C. tenuicaulis. 



Fig. 6. Another of same. 



Fig. 7. Part of peduncle and stolon of C. tenuicaulis. 



Fig. 8. Another stolon of same, nat. size. 



Fig. 9. Four individuals, reduced and part of peduncle omitted. 



Fig. 10. Small individual of C. tenuicaulis. 



