196 



SYDNEY 3. HICitSOff. 



Figs. 2 and 4 are copied from Allman with this modifica- 

 tion, that both endodermal tissue and endodermal cavity are 



Fig. 2. 



Fig. 3. 



Fic. 4. 



Fig. 5. 



Fig. 6. 



Fic. 7 



Woodcuts 2 — 7. The structures of the different gonophorcs compai'ed. 

 Diagrammatic sections of — 2. A phanerooodonic gonophore. 3. The 

 Medusa of Millepora. 4. An adelooodonic gonophore. 5. Male gono- 

 phore of Allopora. 6. Male gonophore of Distichopora. 7. Female 

 gonophore of Distich opora. A. Manubrium. B. Gonad. C. Endoderm. 

 D. Ectoderm. E. Umbrella. 



represented in black. The diagrams are modified in this way, 

 because no important morphological distinctions can be drawn 

 between endodermal structures possessing a cavity and those 

 that do not. For example, no one would think of drawing a 

 fine morphological distinction between the dactylozooids of 

 Millepora and those of Allopora because in the case of the 



