EXPLANATION OF THE PLATES 



The following letters indicate the same parts in all Plates. 

 Ae Ectodermal epithelium of the ampulla. Gp Gasteropore. 



Cn Cnidocysts. 

 Dp Dactylopore. 

 Ds Dactylostyle. 

 EC Ectoderm. 

 En Endoderm. 

 e Ectodermal epithelium of the gastero- 



pore wall. 

 Ge Ectoderm of the gonophore. 



Gs Gasterostyle. 



I The inner cells of the seminal duct. 

 O egg cell. 

 Sp Spadix. 

 s Stolon. 

 T Tentacle, 

 t tabula. 

 W Free wall of the gasterozooid. 



