PLATE XVIII. 



PuGET Sound Ascidians. 



PAGE. 



Fig. I. Cynthia superba Ritter, X 1 590 



Figs. 2 and 3. Cynthia deani Ritter, xi 592 



Fig. 5. Cynthia erecta Ritter, xi 598 



Figs. 6 and 7. Cynthia castaneiformis von Drasche, from 



life, XI 599 



Figs. 8, 9 and 10. Cynthia haustor Stimpson, from life, X i. 601 



Figs. II and 12. Styela stimpsoni Ritter, from life, X i... 602 



Figs. 13 and 14. Styela gibbsii Stimpson, from life, x i... 604 



Fig. 15. Corella willmeriana Herdman, from life, XI 604 



(612) 



