52 
ANNIE MATTHEWS. 
Text-figs. 9-14. 
Fig. 9. Planula just settled (cilia not represented). Fig. 10. Same planula a 
little later, length shortening; still ciliate. Fig. 11. Same, length considerably 
shortened, cilia retracted. Fig. 12. Vertical section of young polyp arranged 
to illustrate two stages in the growth of the mesentery. The vertical, dotted 
line divides the two. The mesentery (c) is intermediate in development 
between mesentery (b\) of Text-fig. 40, and mesentery ( d ) in this figure. 
A broken line indicates the inner edge of the endoderm. Fig. 13. Similar 
section on the third day when the stomodseum is developing. The tentacles 
hive arisen, but are shown by dotted lines as they are alternate with the 
mesenteries. Fig. 14. Lateral view of polyp about eighteen days fixed. 
Tentacles bearing five to six pinnules and spicules showing well. Fig. 15. 
Oral view of polyp with five to six pinnules. Tentacles well expanded., 
mouth almost closed (from bowl, x 25). 
