210 ZOOPHYTES. 



Plate XXXIX. 



10. Vesicles crowded along the rib of a twig. Planulse escaping from 



the vesicle, a, b. 



11. Planula free. 



12. Prolific vesicle with a double row of spherules. 



13. Prolific vesicle, with the contents changing their shape and position. 



14. Prolific vesicle, with the contents, originally spherules, relaxing into 



planulse, one of which is advancing to the orifice. 



15. Section of a stem with cornute vesicles. 



16. Planulse from the cornute vesicles. 



17. Planulffi from cornute vesicles. 



18. Section of a stalk bearing prolific vesicles, with a serrate margin. 



19. Nascent Sertularia, from the planula. 



All the subjects of this Plate, unless fig. 1. and fig. 5, are enlarged. 



Plate XL. Sertularia ( Nemertesia) ramosa. 



