Studìes on Sponges. 447 



Fig. 14. Cells from connective tissue. Imm. VII. etc. as in fig. 10. 

 Fig. 15. Contraeteti (modified?) celi of connective tissue. Imm. VII. Oc. 3. Proj. 

 working table. 



Piate 32. 



Fig. 16, 17, 18. Transverse section; half-diagrammatic The connective tissue 



is yellow ; the epithelial cells are black , the skeleton elements blue. 



Hartn. II, Cam. lue. proj. obj. stage. 

 Fig. 19. Longitudinal section of the top of a cloacal tube; half-diagrammatic. 



Colours as in fig. 1 6 etc. Showing the distribution of the ciliated Chambers 



and the soft inner mass wanting ali skeleton, s.d.c. subdermal cavity. 



Hartn. II; eam. lue. proj. obj. stage. 

 Fig. 20. Transverse section. As in fig. 16. 

 Fig. 21. Longitudinal section of cloacal tube. The yellow lines are the skeleton- 



fibres. The inner wall of the tube is covered by the soft white mass. 



Magnif. pocket-lens. 

 Fig. 22. Transverse section of skeleton, showing the regulär mashes. Hartn. II, 



cam. lue. proj. obj. stage. 

 Fig. 23. Longitudinal section of id. On the right side is the outer part. Hartn. II, 



cam. lue proj. obj. stage. 



