3O EDGAR DAVIDSON CONGDON. 



Orthospadiceous gonophores occur near the proximal parts of 

 the colony. When associated with the other type they are below 

 them on the branch. Only near the base of the colony do they 

 occupy the tips of the branches. They are preceded by the 

 streptospadiceous gonophores in time of development, yet in ma- 

 ture colonies exceed them in abundance. A dozen clusters may 

 occur on one branch and such branches be so numerous at the 

 base of the colony as to form a considerable mass of gonophores. 



FIG. 3. 



Fir,. 4. 



Five to seven gonophores usually form a cluster though any 

 number from two to nine is not rare. They are attached along 

 and around an annulated axis several times their length and of 

 greater diameter than a hydranth pedicel. There is no definite 

 form of arrangement. The base of one extends down part way 

 below the top of another. They are generally associated as 

 closely as -their fusion on one side with the stem will permit. A 

 division into a distal and proximal group at times is indicated by a 

 slight free space on the axis. 



In places where the two types are contiguous the transitional 

 clusters may be present. As we would expect, they consist of 

 orthospadiceous clusters below on a pedicel, with streptospadi- 

 ceous, above on a hydranth. It is not an unusual thing to find 

 gonophores that combine the two kinds of spadices. 



The course of development in the orthospadiceous gonophore 

 is much like that of the other type. The egg in the entoderm 



