EXPLANATION OF THE PLATES 



Tlie following letters indicate the same parts in all Plates. 

 Ae Ectodermal epitlieliuni of the ampulla. Gp Gasteropore. 



Cn Cnidocysts. 

 Dp Dactylopore. / 



Us Dactylostyle. 

 Ec Ectoderm. 

 En Endoderm. 

 e Ectodermal epitlielinin of the gastero- 

 pore wall. 

 Ge Ectoderm of the gonophore. 



Gs Gasterostyle. 

 I The inner cells of the seminal dnct. 

 O egg cell. 

 Sp Spadix. 

 s Stolon. 

 T Tentacle, 

 t tabula. 

 W Free wall of tlie gasterozooid. 



