PLATE XIX. 



PuGET Sound Ascidians. 



PAGE. 



Fig. i6. Cynthia SUperba Ritter, showing papillae, x 60. 590 

 Fig. 17. Dorsal tubercle and portion of dorsal languets of 



same species, x 4 591 



Fig. 18. Branchial sac of same 591 



Fig. 20. A single tentacle of same 591 



Fig. 21. Cynthia deani Ritter, x 60. Portion of test with 

 papillae 592 



Fig. 22. Branchial sac of same species 592 



Fig. 23. Tentacles, dorsal tubercle, and dorsal languets of 

 same species, x 10 593 



Fig. 24. Cynthia macrosiphonus Ritter, x 4. Ten- 

 tacles, dorsal tubercle, and dorsal lamina. 597 



Fig. 25. Cynthia castaneiformis von Drasche, branchial sac 599 

 Fig. 26. Styela Stimpsoni Ritter, branchial sac 602 



(614) 



