PLATE XIV. 



Fig. 1. — Sphaerotylus capitatus, vertical section (x 2.5). 



Figs. 2-4. — Buds of the same ( x la). 



Pig. 5. — Polymastia invagnata, specimen cut in half ; nat. size, p. 15. 



Fig. 6. — Vertical section ( x 25). 



Fig. 7. — Flagellated chambers (diplodal) (x iOO). 



Fig. 8. — Stellate group of tyles in choanosome (x 100) ; 8a, separate tyles of stellate groups (x 100) 



Fig. 9.— Straight style (x 100). 



Fig. 10. — Curved style (x 100) ; 10a, narrower head of another spicule (x 100). 



Fig. 11.— Strongyle (x 100). 



Fig. 12. — Long slender tyle (x 100). 



Figs. 13, 14.— Cortical tyles ( x 100). 



Fig. 15. — Choanosomal tyles (x 100) ; 15a, the same (x 160). 



