PLATE LIII. 



Fig. 7. — Semidiagrammatic median longitudinal section through a bud, 

 showing complete differentiation of all the cell layers. 



Fig. 8. — Semidiagrammatic transverse section through a medusa at 

 the same stage of development as the one shown in figure 7, showing the 

 cell layers and the radial canals. 



Fig. 9. — Semidiagrammatic median longitudinal section through a 

 medusa, showing the manubrium breaking through the outer capsule. 



Fig. 10. — Segment of a transverse section through the manubrium of 

 an older female medusa. 



Fig. 11. — Segment of a transverse section through the manubrium of 

 a male medusa, with a diameter equal to that of the medusa shown in 

 figure 10. 



