hours at most ai'ter it became fi'ee. The lips were a little 

 less distinctly quadrate and the digitella were much smaller 

 than in Fig. 22. On looking through the mouth one could see 

 the four gastric filaments and an opening to the exterior 

 throigh the roof of the stomach left by the rupture of the con- 

 nection with the basal segment of the strobila. Fig. 51 is 

 a section of an ephyrula at about this stage. In this the 

 last vestige is to be seen of the connection betA^een the co- 

 lumella (c.) and the roof of the stomach, and of the degener- 

 ated remnants of the septal muscles (s.m.) in the jelly near 

 the aboral opening. The other end of one of these naiscles 

 is seen at s. m. on the right hand side of the figure. It 

 extends for some distance into the jelly at the base of a gas- 

 tric filament and it is penetrated from the exterior by a very 

 narrow septal flannel (s. f.). 



At a little later stage when the opening in the roof of 

 the stomach has closed both the septal muscles and tiie septal 

 funnels totally disappear. Sometimes one, sometimes the oth- 

 er, is the first to vanish. 



IX. The Later Stages . 



For the present I must pass very briefly over the later 

 stages in the development of Cassiopea. ^Ihile ^Jle umbrella 



54 - 



